ANNUAL REPORT 2007 – 2008

INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE JADAVPUR, KOLKATA – 700 032 (ESTABLISHED IN 1876) Indian Association for the Cultivation of Science 2A & B, Raja Subody Chandra Mullick Road Jadavpur, Kolkata – 700 032, India Telephone : +(91) (33) 2473 4971/5374 Fax : +(91) (33) 2473 2805 Web : http://www.iacs.res.in/ Email : [email protected]

Design, Typesetting and layout Sailee 4A, Manicktola Main Road Kolkata-700 054, Phone : 2352 2263

Photography G C Basak IACS, Kolkata-700 032 INDEX

PART – A 5 From the Director’s Desk 7 IACS Profile 9 Administrative and Financial Set-up 11 Research Work Carried out in various Departments / Units / Centres 21 Projects 28

Journal and Services Indian Journal of Physics 31 Library 33 Central Scientific Services 34 Workshop 39

PART – B 41 Faculty Members and Research Activities Materials Sciences 43 Solid State Physics 54 Spectroscopy 61 Theoretical Physics 70 Energy Research Unit 79 MLS Professor’s Unit 82 Biological Chemistry 83 Inorganic Chemistry 86 Organic Chemistry 92 Physical Chemistry 96 Polymer Science Unit 100 Raman Center for Atomic Molecular & Optical Sciences 103 Centre for Renewable Energy Sources 106 Centre for Advanced Materials (CAM) 108 Inter-Institutional Collaboration 109 Staff & Students Matters 110 4  IACS ANNUAL REPORT 2007-08

Publications Ph. D. (Science) Degree Awarded to Research Workers 156 Research Publications in Peer Reviewed Journals 160 Inter Departmental Publications 184 Paper Published in Books 185 Papers Presented in Symposia / Conferences 186 Staff Strength as on 31st March, 2008 194

Annexure Annual Accounts iii Audit Report viii Budget xix IACS ANNUAL REPORT 2007-08  5

PART – A 6  IACS ANNUAL REPORT 2007-08 IACS ANNUAL REPORT 2007-08  7

From the Director’s Desk

begin with a note of congratulations to the faculty, students and staff members for the Iexcellent performance during the year that has passed by (2007-08). Our research output has been nothing short of spectacular, 380 papers published in Journals of high impact factor (average impact factor ~ 2.2), 42 students have received Ph.D degrees, 9 students have graduated under the Post B.Sc Integrated Ph.D programme in Chemical Science and another batch of 11 students have appeared in the final examination. Two technologies have been transferred to industry, one patent has been sealed, one provisional application has been filed. Systematic renovation of the working laboratories and generation of new quality lab space as well as the quality office space for the faculty, staff and the students continued throughout the year. There has been a noticeable face-lift all around.

The most important achievement has been our success to attract extremely bright young researchers from all over the world – from Stanford, Princeton, Berkeley, Cornell, Innsbruk, Oxford, MPI, MIT, to mention a few. We have succeeded in recruiting 16 young researchers with great potential. Some have joined and some are likely to join shortly. Many would initiate researches in the emergent frontiers of multidisciplinary research. With the addition of fresh blood, IACS shall surely be rejuvenated and look for a qualitative change in the ambiance, productivity and quality of research. It is now the time to translate our common dream into reality – to make IACS one of the best seats of higher learning and research.

The interaction with scientific world at large continued unabated. Eighteen endowment lectures were held giving our faculty and students the opportunity to interact with stalwarts and exchange ideas.

New Centers were established to initiate research in the frontier areas. The Aneesur Rahman Center for High Performance Computing was inaugurated by Professor Michele Parrinello of the ETH Zurich, Switzerland on October 4, 2007 and The Raman Center for Atomic, Molecular and Optical Sciences was inaugurated by Professor Werner Kutzelnigg of the Ruhr-Universität Bochum and Professor Martin Quack of the ETH Zürich on January 9, 2008 – Professor Mihir Chowdhury graced the occasion as the Chief Guest. The Center for Advanced Materials celebrated its first anniversary by organizing a one-day in-house symposium on July 13, 2007 – Professor T Ramasami, Secretary, DST was the Guest of Honor on the occasion. IACS has been identified as the Nodal Center of an Intellectual Property Facilitation Consortium of DST institutes in Kolkata by the TIFAC.

The scientific contributions of the faculty and the students have been noticed by the scientific community all over the world, bringing accolades and recognitions. Notably, Professor K Bhattacharyya received the TWAS prize in Chemical Sciences for 2007, Professor D D Sarma was elected a fellow of the TWAS and a fellow of the American Physical Society. Professor D Mukherjee received the Fukui Medal of the Asia Pacific Association of Theoretical and Computational Chemistry (2008) and elected a Fellow and a Board Member of the Asia-Pacific Consortium on Theoretical and Computational Chemistry. Professor S Ray received the Photovoltaic R&D Award of the Solary Energy Society of India and Professor B C Ranu was elected a Fellow of the Indian National Science Academy. 8  IACS ANNUAL REPORT 2007-08

There have been many more awards, laurels and recognitions brought to IACS by the faculty and scholars.

Our accomplishments are also tinged with a feeling of sadness. Professor A P Mitra, our President for the last four years, passed away suddenly on September 03, 2007. A doyen of Indian Science and an unwavering friend of the Indian Association for the Cultivation of Science, Professor Mitra will be missed by us for many years to come. In a short time he helped transform IACS to rise to new heights with his wisdom, insight and dynamic leadership.

There are problem areas – space crunch, power problem, water scarcity etc. Concerted efforts are being made to tackle all the problems on a short term. An integrated planning is being given shape for tackling all such problems on a long term basis – with a projected requirement of the next 10 years in mind. The plan to construct a second campus has gathered momentum. DPR for the new on-campus laboratory complex, guest house and hostel facilities have been submitted to the DST.

We have received unstinted support from the Council, DST, Government of West Bengal and all sections of staff and scholars.

I specially thank the editorial board for doing a commendable job in compiling the Annual Report in a rather short time. Special thanks are due for Shri N C Das Roy for his commendable efforts.

I wish you a very sunny year ahead. There may be obstacles on our way to further growth, which we shall overcome together.

With cordial greetings to you all,

D Mukherjee IACS ANNUAL REPORT 2007-08  9

IACS Profile

876 was a landmark year in the Annals of Asian Science. In this year was founded a unique institution 1in Bengal which barely about a decade after the Calcutta University started functioning, envisioned initiating teaching and research programs in Science. The Indian Association for the Cultivation of Science (IACS) was the first institute in Asia, which embarked on such a challenging task. The main aspiration to build IACS was Dr. Mahendra Lal Sircar, the first MD from Calcutta. He was the first Asian, who believed that a country could prosper only by the achievement of research in Science. Dr. Sircar’s dream was realized by the inauguration of IACS at 210 Bowbazar Street on Saturday, July 29, 1876. In the early phase, the list of lecturers in Science in IACS included all the intellectual luminaries of the era: Rev. Father Lafont, Jagadish Chandra Bose, Asutosh Mukherjee, Chunilal Bose and Pramathanath Bose. Pandit Iswar Chandra Vidyasagar and Kesab Chandra Sen were among the members of the first Trustee Board of IACS, with Dr. Sircar himself as the first Honorary Secretary. Apart from these great scholars, the stalwart public figures like Gurudas Banerjee, Rajendralal Mitra and Surendranath Banerjee were its patrons. Raja Peary Mohan Mukherjee was the first Indian to take the position of the President of IACS in 1912. His other distinguished successors have been Dr. Nilratan Sircar, Jnan Chandra Ghosh and Satyendra Nath Bose. The IACS entered a new phase with the emergence in the scene of C V Raman in 1907. He initiated serious research in IACS as a part-time worker, while carrying out his duties in the Accountant General’s office in Calcutta – under the inspiring leadership of Dr. Sircar’s son Amrita Lal Sircar - the then secretary of IACS. The rest was history. The celebrated Raman Effect was discovered in 1928, which culminated in Raman’s receiving the Nobel Prize in Physics in 1930. IACS still to-date remains the institute of India, which has fetched a Nobel Prize in Science. Raman started a vibrant school of research, which attracted quite a few talented scientists, who furthered the progress of research along with and after the departure of Raman, K S Krishnan started the pioneering school of modern magnetism and structural physics. K Banerjee pioneered the early development of the direct method of crystallography. IACS in the independent India continued to flourish. The modern phase of IACS was started by Meghnad Saha, the eminent Astrophysicist. In the year 1948, on 26th September, the foundation stone of a new building of IACS was inaugurated by Dr. Bidhan Chandra Roy at Jadavpur. In the year 1951, the new building became functional, and several new departments were opened. In 1953, Meghnad Saha became the first full-time Director of IACS. The institute reached new heights with his scientific vision, leadership and personal influence. With his untimely demise in 1956 IACS suffered a temporary setback, but under the guidance of Satyendra Nath Bose, P Ray and others it rapidly started flourishing again in full vigor. Saha’s leadership provided the mood and mantra of IACS in forms of development, expansion and progress. Some noted researchers of the immediate past who brought glory and distinction are Drs. A Raychaudhuri, S C Sircar, B N Srivastava, A Bose, P Ray, P C Datta, N K Datta, S R Palit and S Basu. All of them, with their younger compatriots gave a new dimension to the milieu of research by their original scientific contributions. Samarendra Nath Sen, the first Registrar of IACS, made pioneering contributions in the study of history of Indian science. This tradition in excellence of research continues unabated this day. National and international recognition in the form of major prizes and medals, fellowships of distinguished scientific academies, editorship of leading journals followed. IACS has the highest number of Shanti Swarup Bhatnagar (SSB) Awardees among all the academic institutions of Bengal. It also has the highest number of Fellows of the learned 10  IACS ANNUAL REPORT 2007-08

Academies of India and abroad among institutes of Bengal.

The Department of Science and Technology (New Delhi) and Government of West Bengal are the principal fund-giving agencies supporting research in IACS. It also generates funding through various research projects from several funding agencies in India and abroad including projects supported by DST.

IACS has currently eight departments : 1. Materials Science 2. Solid State Physics 3. Spectroscopy 4. Theoretical Physics 5. Biological Chemistry 6. Inorganic Chemistry 7. Organic Chemistry 8. Physical Chemistry

There are also three active units : 1. Energy Research 2. MLS Professor of Physics 3. Polymer Science

Four new Centres have been created : 1. Centre for Theoretical Sciences 2. Centre for Advanced Materials 3. Centre for Renewable Energy Sources 4. Raman Center for Atomic Molecular and optical Sciences

They have just become operational, albeit at a low key.

In 1976, IACS completed its hundred years when the organization published a book, “A Century”, which encapsulates IACS’s past and the then achievements and future possibilities. The centenary celebration was inaugurated by the Prime Minister, Smt. Indira Gandhi on July 29th, 1976 spreading over a full year.

A unique feature of IACS is a strong synergy existing between theoretical and experimental sciences. Its theoretical research is considered first rate by any standard, and its experimental groups have charted new frontiers – be it with synthesis of novel molecules, designing polymers or fabricating new materials with tantalizing possibilities. The Chemistry and Physics wings have faculty members who are the acknowledged leaders in their fields. Over the past two decades, IACS has initiated research activities with a strong technological bias. Several patents have been filed, and pilot plants to study the efficacy of alternative sources of energy have been initiated. IACS has world-class activity in synthetic chemistry, biomimetic chemistry and chemistry and physics of materials – including nanomaterials, in designed polymers, in unraveling the mechanism of ultrafast chemical dynamics, drug design and in theoretical chemistry / physics.

The future of IACS depends upon the new generation who will venture into newer domains and IACS ANNUAL REPORT 2007-08  11 will open new vistas. On completion of its 125th year, at the confluence of its past and present, IACS takes a vow to carry on its tradition, with visions of a future pregnant with possibilities, and bring to fruition the undying dreams of its founder and the compatriots.

In accordance with the suggestion given by DST in its letter no. Ai/001/97 dated 01.08.1997 the following materials on administrative and financial set up are also furnished :

1. ADMINISTRATIVE

1. Composition and tenure of :

a. Governing Council

Professor S K Joshi, (Chairman) (Nominated by the Department of Science & Technology, Government of India)  (also the President of the Management Committee elected by the General Body)

Professor Debashis Mukherjee, Director, I A C S

Secretary to the Government of India, Deptt. of Science & Technology or his nominee

Financial Advisor to the Government of India, Deptt. of Science & Technology

Principal Secretary to the Government of West Bengal, Deptt. of Higher Education

Professor S Chandrasekaran, Deptt. of Organic Chemistry, IISc., Bangalore Professor S Pal, Director, ISI, Kolkata (Nominated by Govt. of India, Deptt. of Science & Technology for three terms)

Professor Alok K Gupta, Director, NCEMP, Allahabad (Nominated by INSA for three terms)

Professor Sabyasachi Bhattacharya, Professor, TIFR, Mumbai Professor Sandip K Basu, Professor, National Institute of Immunology, Delhi (Nominated by the Council of IACS for three terms)

Professor S Lahiri (Elected from amongst Academic staff for one term)

Shri Basab Chattopadhyay (Elected from amongst Research Fellows & Associates for one term)

Sri Adhir Nath Ghatak (Elected from amongst Administrative & Technical staff for one term) 12  IACS ANNUAL REPORT 2007-08

Shri S K Mukherjee, Registrar – Non-Member Secretary

b. Finance Committee (Tenure : Permanent) Chairman, IACS Director One Representative of Ministry concerned, GOI Professor Anandadeb Mukherjee, Trustee, nominated by the Council Principal Accountant General, Govt. of West Bengal Jt. Secretary, Deptt. of Finance, Govt. of West Bengal (Invitee Member) Registrar, IACS, Non-Member Secretary

c. Research Advisory Committee (Tenure : Three years)

Professor S Dattagupta (Chairman) Director, IISER, Kolkata

Professor V Chandrasekhar Professor T K Chandrashekar IIT, Kanpur Director, RRL, Thiruvanthapuram

Professor E D Jemmis Professor T K Chakraborty IISc., Bangalore IICT, Hyderabad

Professor Ashutosh Sharma Professor N Periasamy IIT, Kanpur TIFR, Mumbai

Professor N Chandrakumar Professor K N Ganesh IIT, Chennai IISER, Pune

Professor S B Krupanidhi Professor A Surolia IISc., Bangalore National Institute of Immunology, New Delhi

Professor Avinash Khare Professor Ajay Kumar Sood Institute of Physics, Bhubaneswar IISc., Bangalore

Professor Pratima Sinha Professor D Mukherjee (Convenor) Bose Institute, Kolkata Director, IACS

d. Trustee Professor S N Ghosh Professor Anandadeb Mukherjee Professor Bhabatarak Bhattacharyya Professor S P Moulik Professor Dipti Kumar Chattoraj

e. Editorial Committee for Annual Report (Tenure : One year) Professor S Sengupta - Chairman Dr. P Dastidar - Member IACS ANNUAL REPORT 2007-08  13

2. ORGANISATIONAL CHART

GENERAL BODY ↓ GOVERNING COUNCIL ↓ DIRECTOR ↓ ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­______↓ ↓ ↓ ↓ ↓ ↓ Registrar Head of Deptt.s/Units* Workshop CSS** IJP*** Library

­Administration Materials Science Establishment Solid State Physics Accounts Spectroscopy Engineering Theoretical Physics Biological Chemistry Inorganic Chemistry Organic Chemistry Physical Chemistry Energy Research Unit MLS Professor of Physics’s Unit Polymer Science Unit Centre for Theoretical Sciences Centre for Advanced Materials Centre for Renewable Energy Sources Raman Center for Atomic Molecular and Optical Sciences

*** CSS -: Central Scientific Services *** IJP -: Indian Journal of Physics

Dr. R Mukhopadhyay - Member Shri A Roy - Member Shri N C Das Roy - Convener

3. Implementation of Official Language Policy

During the year, the Association has implemented Official Language (Hindi) as per the rules of the Government of India. For proper and effective implementation, the Association has constituted an Implementation Committee under the Chairmanship of the Registrar. The meeting of the said committee is being held regularly to advise the Association regarding implementation of Hindi as Official Language. On the recommendation of the above Committee, one part-time Hindi Officer has been appointed on June 14, 2007 to meet the day to day need of drafting letters, office memorandums, filling up different forms in Hindi in terms of the Official Language act, 1964.

The Association has also initiated a Hindi Training Centre for its staff members, in which 78 staff 14  IACS ANNUAL REPORT 2007-08 members have already received training in Hindi Proveen and Pragya courses under the active supervision of Hindig Teaching Scheme, Department of Official Language, Ministry of Home Affairs, Government of India.

During the year, the Association has also celebrated “Rajbhasha Diwas” on 19th September, 2007, in which Prof. S P Bhattacharyya, the Director (Actg) of the Association had kindly precided over the programme. Mr. S L S Purti, Deputy Director (Eastern), Hindi Teaching Scheme, Government of India and Mr. Praveen Kumar, Chief Manager (OL), Allahabad Bank was invited as Chief Guest and Guest of Honour respectively. In the programme, the staff members of the Association actively participated in the cultural activities like performing songs, recitations etc. in Hindi.

4. IMPLEMENTATION OF RIGHT TO INFORMATION ACT

The Association has taken steps to implement the provision of Right to Information Act enunciated by Government of India from time to time. Shri Amit Kumar Manumder, Office Superintendent and Shri Prabir Manna, Assistant has been appointed as the Central Public Information Officer and Assistant Public Relation Officer, respectively.

5. STATUS OF SC/ST/OBC/PHYSICALLY DISABLED PERSON RESERVATION

After the Governing Council adopted the principle of SC/ST/OBC/Physically Disabled Person reservation quota, the Association has been following the policy of the Government in the matter of direct recruitment of Academic and Non-Academic staff.

A brief statement in regard to the recruitment in the post of reserved categories till 31st March, 2008 is appended below:

Category No. of post No. of No. of post No. of post No. of post to Post filled up identified Vacancy filled up Advertised be Advertised agsint future available vacancy

A 08 08 02 06 – –

B 08 08 07 01 – –

C 47 40 32 08 – 07

D 35 23 19 – 4 12

Total : 98 79 60 15 04 19

6. PERSONNEL PROFILE

Group No. of Scientific / Tech. Staff* Academic* Administrative / Technical*

A 05 101 09 B 23 – 11 C 87 – 57 IACS ANNUAL REPORT 2007-08  15

D 36 – 71

*The above includes the substantive posts kept in abeyance under orders of Government of India.

7. ENDOWMENT LECTURES

Mahendra Lal Sircar Memorial Professor Sabyasachi Bhattacharyya Endowment Lecture Director, TIFR, Mumbai

Bimla Churn Law Memorial Lecture Professor Amitava Chattopadhyay Centre for Cellular and Molelcular Biology, Hyderabad

Bimla Churn Law Memorial Lecture Prof. R N Mukherjee IIT, Kanpur

Shri Rajendra Lal Mitra Professorship Professor Prashant V Kamat Lecture University of Notre Dame, USA

Sir C V Raman Memorial Lecture Professor Michele Parrinello ETH Zurich, Switzerland

First J C Bose Memorial Lecture Professor C N R Rao, F R S JNCASR, Bangalore, India

First Aneesur Rahman Memorial Professor Michael L Klein, FRS Lecture Laboratory for Research on the Structure of Matter University of Pensylvania, USA

Professor K S Krishnan Memorial Professor G A Gehring, Lecture University of Sheffield, UK

Mahendra Lal Sircar Memorial Professor Sriram Shastry Endowment Lecture University of California Santa Cruz, CA, USA

Mahendra Lal Sircar Memorial Professor Sankar Das Sarma Endowment Lecture University of Maryland, USA

T K Rai Dastidar Memorial Lecture Professor Deepak Mathur TIFR, Mumbai

Sir C V Raman Memorial Lecture Professor Werner Kutzelnigg Fakultat fur Chemie und Biochemie der Ruhr- University Bochum, Bochum, Germany

Sir C V Raman Memorial Lecture Professor Martin Quack Swiss Federal Institute of Technology ETH Zurich, Switzerland

M N Saha Memorial Lecture Professor O K Andersen Max-Planck-Institut fur Festkorperforschung Stuttgart, Germany

Akshoy Dutta Memorial Lecture Professor Rajesh Kochhar NIPER, Mohali, Punjab

A P Mitra Memorial Lecture Professor Somnath Dasgupta, 16  IACS ANNUAL REPORT 2007-08

as a part of Science Day Celebration IISER, Kolkata

Samarendra Nath Sen Memorial Lecture Professor Rajinder Singh University of Oldenburg, Germany

8. POST-B.Sc. INTEGRATED PH.D PROGRAMME

In an effort to foster academic cooperation between Research Institutes and Universities, IACS has started conducting a Post-BSc Integrated PhD Programme in chemical sciences (PBIR) since the academic session 2005-2006 and this is run as a joint venture with S N Bose National Centre for Basic Sciences (SNBNCBS). Based on a MOU between IACS and West Bengal University of Technology, the programme enjoys its affiliation for the course with the aforementioned university. The primary objective of this five-year PBIR programme is to offer research-oriented multidisciplinary courses in chemical sciences for the first two year as a part of requirement for M. Sc degree, followed by admission of the students to Ph.D. programme in different departments of IACS and SNBNCBS. For other details we refer to the website of the Institute.

After successful clearance of a National level written test and interview eight students got admitted to this programme in the year 2007-2008 out of nearly 450 applicants. The students are provided with stipend, accommodation and transport facilities and are also covered by medical scheme and other welfare measures of the Institute.

9. HRD PROGRAMME UNDERTAKEN

During the year, the faculties of IACS have undertaken a number of activities pertaining to societal interests. These activities can be divided into two broad categories, i.e., popularization of science and human resource development (HRD).

The popular lectures on various topics ranging over different disciplines of basic and applied sciences were delivered all through out the year within IACS and at various places within Kolkata and in other states. University Grant Commission and National Academy of Sciences were two of the primary sponsors of such events.

The human resource development program has been undertaken with great interest and vigor this year. Apart from the summer projects carried out at various laboratories by the bachelor/master’s level students from all over the country, events like National Science Day were celebrated with a focus on school children. An EDUSAT (education using satellite technology) program was held for the Children Science Congress. Summer schools were held during the summer months both within IACS and at places like CMERI, Durgapur for the school children. Faculties have also taken part in the question paper setting and final selection process for the KVPY (Kishore Vaigyanik Protsahan Yojana) fellowship program organized by DST, Govt. of India. Lectures were delivered in the Refresher Courses for the college teachers at various colleges within Kolkata in order to expose them to the most recent developments in science and technology.

Staff training program: The Administration has undertaken the following programmes as part of HRD activities for improvement of staff performance and internal development of IACS.

i) Shri Amit Kumar Majumdar, Office Superintendent and Shri Arup Kumar Saha, Office Superintendent (F&A), Administration, participated in the Training Programme for enabling Administrative and Technical Personnel in S&T Departments, Government of India, conducted by the Indian Institute of Public Administration, New Delhi, during July 02 – 20, 2007. IACS ANNUAL REPORT 2007-08  17

ii) Shri Sasanka Maji, Technical Officer, CSS, participated in the Seventh Foundation Training Programme for Scientists and Technologists, conducted by the Indian Institute of Public Administration, New Delhi, during August 06 – October 13, 2007.

iii) Shri C K Das, Shri B Dafadar and Shri S Chanda attended an International Workshop on Digital Preservation of Heritage organized by Indian Statistical Institute, Kolkata during October 29 – 31, 2007.

iv) Smt. Manika Banerjee, Shri Abhijit Dasgupta and Smt. Gayatri Paul, Library attended a Seminar on Self Archiving and Digital Repository organized by Indian Statistical Institute, Kolkata during October 31 – November 3, 2007.

v) Smt. Monika Banerjee, Librarian and Smt. Dipanwita Mandal, Assistant, Administration, participated in the 3rd Advanced Training Programme on Cyber Laws, Information Security & Computers especially for Women Administrative Personnel of S&T Department, Government of India, conducted by the Indian Institute of Public Administration, New Delhi, during January 07 – 18, 2008.

vi) Shri C K Das, Library, attended a Seminar on Environment and Development organized by West Bengal Academy of Science and Technology, Kolkata during February 22 – 23, 2008.

vii) Shri S N Bose, Engineer (Civil) and Shri A K Sarkar, Assistant Enigner (Civil) participated in the Technical Workshop on ‘Purchase Policy & Procedure in Governemnt Department’, organised by Centre for Training & Social Research, New Delhi, during February 26 – 28, 2008.

viii) Shri S Mukhopadhyay, Finance & Accounts Officer, attended in the Conference on Accounts, Finance & Budget Issues, organized by the Controller of Accounts Office, Government of India, New Delhi held on March 18, 2008.

10. STRATEGIC MANAGEMENT UNIT (SMU)

The Association has been growing at a steady pace for some time and has plans for further large scale expansion in the days to come. This has resulted in a growing national stake by way of increased government grant and called for the formation of a Strategic Management Unit (SMU) to formulatesuitable plans in various strategic areas. A unit comprising two Advisors (Planning and Development) was accordingly set up in late 2006.

The unit extended active support towards coordinating different activities relating to implementation of the recommendations of the Structural Reforms Committee. It has introduced the system of micro- budgeting for both Plan and Non-Plan Expenditure and put in place a system for monitoring timely utilization of government grants. It has also formulated appropriate ways for planning expenditure and investments in an optimal manner.

The unit has set up a Training Cell, which caters to the vital requirement of skill upgradation among different sections of non-academic staff. Several programmes have been successfully arranged by them for both administrative and technical staff. A list of such programmes is given below. The Training Cell has concluded an agreement for launching short term training programmes in various subjects jointly with the West Bengal University of Technology (WBUT) and such programmes have already 18  IACS ANNUAL REPORT 2007-08

Topic Participants Speaker

Foreign Exchange Transactions and Exchange Administrative Dr. U K Basu, IACS Arithmetic

Improving Personal Effectiveness in Teams General Mr. A K Biswas, IACS

Income Tax General Officials of IT Deptt.

Foreign Purchases, Letter of Credit and Bank Administrative Dr. U K Basu, IACS Guarantees

Workshop Practices & Machining Technical Dr. GMajumder (Workshop) Dr. B Oraon, JU

Financial Markets-an overview and recent Administrative Dr. U K Basu, IACS developments

Why we are excited about Nano Science Technical Prof. D D Sarma, Dr. S Giri, Dr. N Pradhan, IACS

Principles of X-Ray Diffraction Technical Dr. Bhupati Chakrabroty

gone on stream. It has also gone for arrangements with the Jadavpur University and its Department of Adult, Continuing Education and Education for conducting various technical programmes.

11. INFRASTRUCTURAL DEVELOPMENT

The Institute has taken up various infrastructural expansion and modernization / upgradation programme. Engineering section has successfully overcome a serious embargo imposed by Kolkata Municipal Corporation prohibiting any construction within the IACS premise. 22 numbers of unauthorized building units have been regularized through KMC and the long outstanding land tax dispute has been settled by KMC with substantial waiver to the Institute.

Two new seminar halls have been created. The 400 odd capacity Auditorium has been modernized. A modern Administrative cum Accounts complex has been created. Director’s complex with Council Room has been upgraded. Various new laboratories like MLS – Laboratory, Anisur Rahaman Hi- Computing centre, Crystal Growth Laboratory, MBE-STM-PEEM Lab, Crystal Diffractometer laboratory have been constructed and comissioned. Many more such laboratories are in the pipeline. The work of modernization /upgradation of all wet-laboratories are progressing first. About 30% of them are already commissioned. The Institute is planning to get Corporation Water Supply from garden Reach for process, drinking and Firefighting purpose.

Tendering work of extension of Library Building by addition of 3 more floors is nearing completion. The execution is likely to start by first week of September 2008. The Institute is building up a Nano Initiative Research centre and for that Architect cum Consultant has been selected.

DPR for the proposed new Laboratory Complex and International Hostel cum Guest House has been prepared and submitted to Ministry. Very recently a new automatic lift has been installed by replacing IACS ANNUAL REPORT 2007-08  19 the old one in the main building.

12. MISSION PROGRAMME FOR TECHNOPRENEURSHIP

It is felt that the original mandate of IACS to enable ‘varied applications of science to the arts and comforts of life’ would remain incomplete without an interlinking between science and society. The Fourth Review Committee has strongly recommended the initiation of applied research and work towards practical applications of the scientific advancements in the laboratories. In this connection, the interfacing with the industry was strongly supported.

In the backdrop of the above, the Governing Council cleared the Mission Programme for Technopreneurship during April 2006, to be undertaken as a mission-mode initiative under the 11th Five-Year Plan to serve as an outreach organ of the institute in terms of technology development and transfer. It is mandated to inculcate innovation and knowledge-based entrepreneurship amongst the scientists and enable IACS position itself as an effective provider of technology products and techno- entrepreneurial outputs.

Objectives:

 Serve as a single-window approach to institutional technology management  Establish a technology business incubator to support and develop effective technopreneurship  Facilitate networking with professional resources  Identify technologies/innovations that have potential for commercial ventures.  Undertake capacity building in knowledge based enterpreneurship.

Achievements:

 The Programme coordinated successful licensing of two technologies to the industries and also negotiated the fruition of two industry-institute R&D projects for IACS.  One provisional patent application has been filed in India. (One patent has also been granted)  The Programme has been identified as the implementing platform for the Nodal Centre of the Intellectual Property Facilitation Consortium of DST Institutes in Kolkata established at IACS

Patent Granted:

Patent Title Inventors Country Number

201374 A multi-junction a-Si:H Solar Cell Swati Ray, A K Barua, S C Saha India

Technologies Transferred:

Title Inventors Industry

A layer-by-layer sequential adsorption G B Talapatra and A J Pal Apex Instruments apparatus Co., Kolkata

Single-junction amorphous silicon solar A K Barua, S Ray, D Shome, Hind High Vacuum cell technology phase-1 I N Bhowmik and D Prasad Pvt Ltd, Bangalore 20  IACS ANNUAL REPORT 2007-08

by the TIFAC, Department of Science & Technology, New Delhi. An extramural support of Rs 15 lakhs has been received under this project.  A comprehensive Intellectual Property Rights Policy for IACS has been compiled.  Initiation of work on IPR and Technology Information System

13. Aneesur Rahman Center for High Performance Computing

The Aneesur Rahman Centre for High Performance Computing was inaugurated by Professor Michele Parrinello of ETH Zurich, Switzerland on October 4, 2007.

The Centre started with a Xeon Dual-core (Xeon 5160, 3.0GHz)12-node cluster (48 no. of effective cores) with 24GB RAM and 250GB X 2(SATA) HDD on each node, having Silver storm infiniband Interconnectivity. The cluster is running under Linux Centos 4.4 OS and MPICH2 and is having all common compilers like gcc, g77, Intel fortran 10.0.023. Standard routines like Gaussian, Vasp, Wien (04,07), PWA, LMTO, Gamess, Dirac04, xcryden are running on the cluster.

One Intel Xeon Quad-core 72-core Supermicro Cluster (1 Master and 8 Compute Node, total 9 numbers of 1U modules) was later installed in the Center to complement the Dual-core cluster. It has 32GB DDR2 RAM per module, 2.5 TB (150GB X 10) HDD storage, 16MB on-board graphic card, and a high speed low latency Dolphin SCI-2D interconnect switch. This Quad-core cluster is supplied and maintained by M/S Netweb Technologies. It has been procured under the BRNS-CRP project on Spintronics Materials and is being used for large scale electronic structure and molecular dynamics simulations of novel bulk and nano-materials.

Both the Dual-Core and the Quad-core clusters will be part of the High Performance Computing Centre that is planned to be set up at IACS (on the second floor of the existing Library Building) in order to cater to the needs of the existing groups involved with extensive number crunching and visualization, in physical, chemical and biological simulations. This will not only complement the ongoing experimental programmes, but also open up new initiatives in emerging areas related IACS ANNUAL REPORT 2007-08  21

Research Work Carried Out in various Departments / Units/ Centres During the Year 2007 – 08

n the Materials Science Department, a complete theoretical study of multiphoton dissociation of the Isimplest one-electron polar molecule in ultrashort, highly intense laser fields has yielded new information on the dynamics of such processes and also on the dependence of such a process on the controllable parameters. The basic mechanism of population transfer by stimulated hyper –Raman nonadiabatic passage has been elucidated through extensive calculations. The effects of strong laser light on photoassociation spectrum of ultracold atoms and mechanisms of long- and short-range interactions in different geometries of ultracold atomic Fermi gases have been investigated. Electronic structure and molecular dynamics calculations have been carried out using state-of-art density functional based simulation techniques. Hydrogen storage materials with optimum absorption as well as desorption have been designed both in bulk and nanostrstructures. 3d transition metal doped diluted magnetic semiconductor and diluted magnetic oxide systems depicting high Curie temperature, relevant for spintronics applications, have been investigated. A general methodology based on self-consistent band structure calculations has been worked out for determining and analyzing the spin-induced transport in ferromagnets. A state of the art experimental facility for research in surface science and nanoscale science has been set up. This facility involves a molecular beam epitaxy (MBE) growth system, an ultrahigh vacuum variable temperature scanning tunneling microscope, a photoemission electron microscope and scanning tunneling spectroscopy to investigate geometric structure, morphology and electronic structure of the MBE-grown nanostructures. A new nonlinear optical material L-valine has been synthesized for the first time and second harmonic efficiency of this material is found to be comparable to urea. Ionic conductivity of polymer electrolyte nanocomposites has been investigated. Large magnetoresistance and structural phase transition of ferromagnetic shape memory alloys have been observed. Novel organic-inorganic hybrid mesoporous silica has been synthesized by grafting a tunable chemosensor in their pore-walls, which shows excellent luminescent, ion–exchange and metal ion sensing properties. A new mesoporous all organic cross-linked polymer has been synthesized by surfactant templating route. The energy transfer mechanism between CdS nanoparticle and dye has been investigated. Self-assembled semi-circular cubic CdS nanowires and Mn doped ZnSe nanocrystals have been synthesized. Dilute magnetism in single crystalline ferroelectric BaTiO3 has been reported.

The validity of Altshuler-Aronov theory has been probed in the disordered double perovskite Sr2FeMoO6. Electrical properties of low dimensional organic semiconductors and metals have been studied.

In the Solid State Physics Department, the Novel CuO based giant dielectric materials for microelectronic applications are developed. Low temperature magnetic and transport properties of rare earth based CMR and GMR materials and Cd-Cr-X (X=Se,S,) type magneto-ferroic materials are investigated. Transport and magnetic studies on mixed-valent perovskites and magnetic nanostructured materials indicate exchange bias effect, glassy magnetic behaviour, improved magnetic properties for the potential applications in memories and spintronics applications. The research activities also include the investigation of bulk intermetallic alloys showing first order magneto-structural transition. It focuses on various functional aspects of the materials including magneto-caloric effect, giant magneto- resistance and magnetic memory applications. Investigated the role of defects in oxide based diluted 22  IACS ANNUAL REPORT 2007-08 magnetic semiconductors both in the bulk and nanocrystalline form and electronic structure of low dimensional quantum spin systems to understand and explain their novel magnetic properties. Electrical bistability with large conductance switching has been observed by Scanning Tunneling Microscope in a monolayer of CdSe nanoparticle. High-density memory devices with one bit per particle has been successfully prepared. Conductance switching induced by carbon nanotubes has been observed in devices based on organic thin films. Nanodiodes based on a p-type and an n-type ZnO nanoparticles has been formed. ZnO-based undoped and doped thin films, heterojunctions, nanostructures have been grown and their structural, morphological, electrical, optical and optoelectronic properties have been studied to investigate the prospects for optoelectronic applications. Nanowires of high aspect ratio were developed in glass-nanocomposite matrices and their tansport mechanism was investigated. Relaxation dynamics of charge carriers in superionic glasses, polymer- and glass-nanocomposites was studied in a wide temperature range. Ab-initio structure determination of complexes exhibiting in vivo anticancer activity, has been accomplished from X-ray powder diffraction data. Structural study of a symmetrical dipeptidyl urea, having four molecules in the asymmetric unit was established using synchrotron radiation.

The Spectroscopy Department, was mainly involved in both experimental and theoretical research investigations in the frontier areas of basic and applied sciences. Broadening of Electromagnetically Induced Transparency (EIT) window has been controlled by controlling the incoherent pumping rate in three level system with homogeneous and inhomogeneous broadening when both the spontaneously generated coherence and the dynamically induced coherence interfere with each other. Ground state and Dynamical properties of atomic BEC studied analytically are in very good agreement with numerical results. Cluster calculation was proved to be very successful in predicting the spectra of alkali atoms under liquid helium environment. Development of method to study the spectroscopic properties of weakly bound molecules and its application to molecules containing heavy halide atoms was successfully made. Preferential appearance of cis and trans anionic conformers in different non-ionic micelles due to structural influence of the micelles on the excited state proton transfer photophysics of 2-hydroxy 1-naphthaldehyde has been established on the basis of theoretically calculated barrier height of formation and time-resolved emission results. Concentration dependent orientational changes of 2 Amino-2-thiazoline molecule adsorbed on silver nano colloidal surface has been investigated by SERS and DFT. Adsorption of 4-Methyl-4H-1, 2, 4-Triazole-3-Thiol molecules on silver nano colloids has been studied using FT-IR, Raman, SERS and DFT. Nanoparticles and nanoflowers of different phthalocyanines were grown on suitable substrates at room temperature and the surface morphology, optical properties and the fractal dimension of the nanostructured phthalocyanine thin films were studied. Some potential organic-inorganic nanocomposite systems by combining novel synthesized organic dyads with semiconductor TiO2 nanoparticles along with artificial molecular ON-and-OFF devices have been built. An induced alignment of ZnO nanomaterials has been achieved in LC medium and with the applications of electric field a perfect ON-and-OFF states have been observed under crossed polarizer.

In the Theoretical Physics Department, the Randall-Sundrum braneworld model has been generalized to arbitrary number of warped dimensions. The model provides a possible resolution to the fermion mass hierarchy problem in the standard model.Also various aspects of a slowly rotating dilaton black hole have been studied in an anti-desitter spacetime. Problems of stabilizing moduli of the type—IIB string theory on toroidal orientifolds of a six-torus, in presence of worldvolume fluxes on various D-branes, have been considered. For actions, introducing either O9 or O3 planes, we rule out the possibility of moduli stabilization in a wide class of models with N=1 supersymmetry, characterized by the type of fluxes turned on along D-brane worldvolume. In the context of supersymmetry the consequences of IACS ANNUAL REPORT 2007-08  23 moderate or large negative values of the common trilinear soft breaking parameter have been studied. It is shown that in this region several processes including lightest supersymmetric particle (LSP) pair annihilation, LSP - lighter tau slepton co-annihilation and LSP - lighter top squark co-annihilation contribute to the observed dark matter relic density.As an experimental signature for extra dimensional theories, PVLAS results on birefringence and dichroism is shown to put severe restrictions on the axion mass and modulus if Randall-Sundrum model of observing sneutrino-antisneutrino oscillation in the context of LHC is being analyzed. Chiral phase transition of compact U(1) lattice gauge theory in the deconfined phase and the higher energy states of the flux tube / hadronic string formed between a quark anti-quark pair in pure Yang-Mills theory are being studied. The formation of antihydrogen in the ground and excited states (2s, 2p) via positrons has been demonstrated. Cold hydrogen-hydrogen scattering has also been investigated using non adiabatic close coupling approximation model.The problem of electron in a magnetic field on the two dimensional lattice has been studied. A powerful software to identify some of the unconventional tRNAs has been developed. Also experimental verification of prediction of overlapping tRNAs is being investigated. Bogoliubov-de Gennes equations have been solved self consisitently with strong correlation effect. The result is consistent with the experimental findings. By studying Ginzburg-Landau theory, a crossover temperature at which pairing transforms into spin-triplet or spin-singlet only has been predicted. The spin-Hall conductivity is shown to resonate for a disordered system when spin precission length matches with the wavelength for variation of the electric field.The issue of travelling and standing waves in a circular hydraulic jump was explored to bring out the close connection between the radius of the jump and the radius of a white hole. We looked at the question of persistence infinite geometry for an order parameter field when it is quenched from a high temperature to the critical temperature.

In Energy Research Unit, the Nanocrystalline silicon films were developed in RFPECVD by changing various deposition parameters e.g., applied rf power, hydrogen dilution, separation of the electrodes, etc. Compressive and tensile stresses in the films and changes in the microstructure were measured. Silicon quantum dots (Si-QDs) in controlled size and distribution were prepared in nano-crystalline Si structures by precise seeding of the nuclei on various substrates, by proper control of the grain size and grain boundary states. In addition to the use of hydrogen, as the diluent of silane, argon and helium are also tried to enhance nano-crystallization at high growth rate. Utilizing the two-phase structure of silicon-oxide, nano-crystallization to the Si-network was initiated within the silicon-rich phase of the material, while oxygen-rich barrier layer was used to control the growth of crystalites within nano-dimensions. Silicon carbon alloy material developed in our lab was found to possess very high ultra violet sensitivity. Using a modified plasma CVD technique films of silicon-germanium alloy with band gap of 1.4 eV was deposited with diffusion length (LD) of 100 nm. An industry-Institution research project on polymorphous silicon material has started involving our laboratory and two other French laboratories together with a French industry. Aluminum doped ZnO films have been developed as antireflection coating using reactive sputtering technique. Amorphous Si/ nano-Si double junction solar cells were fabricated. Current-voltage characteristics and quantum efficiencies of the cells were measured. Degradation studies have been made on microcrystalline cells having different crystalline fractions. Using protocrystalline Si films stable single junction cells with more than 7% efficiency have been developed. A project has been started to develop a calibration facility for testing of the reference solar cells and modules centered at IACS and involving several other laboratories. Our indigenously developed one-dimensional electrical-optical model ASDMP (Amorphous Semiconductor Device Modelling Programme) has been applied to simulate the experimentally obtained dark J-V, light J-V and spectral response characteristics of micro-crystalline silicon (?c-Si:H) PIN solar cells of different degrees of crystallinity. The novel “Heterojunction with Intinsic Thin layers” or “HIT” solar cells, of the 24  IACS ANNUAL REPORT 2007-08 variety N-a-Si:H / P-c-Si, fabricated in Sanyo, Japan, have been modeled using ASDMP. Effort is being made to introduce direct tunneling into model ASDMP.

In the MLS Professor’s Unit, several nanocomposites have been synthesized and their properties delineated. Ag2S nanoparticles in a silica matrix exhibited a resistivity hysteresis signifying melting of the cation sublattice. Multifunctionality was developed in a silicate glass containing nanophases nickel and barium titanate respectively – These showed optical nonlinearity, high dielectric constant and ferromagnetic behaviour. Zinc sulfide nanocrystals doped with iron were synthesized. They exhibited ferropmagnetic behaviour arising out of a one-dimensional magnetic system.

In the Biological Chemistry Department, the immunomodulatory activity of methylglyoxal, also a potent antitumor agent, has been observed and studied. A novel Glyceraldehyde 3 phosphate (GAP) binding protein from mice muscle has been identified and partial characterization to ascertain its biochemical and molecular properties in biological system has been made. A yeast strain has been isolated from soil which can grow in whey and the production of â- galactosidase by the organism has been investigated. The ultrastructural changes of the cell wall along with the formation of layered structures upon interaction of chromium with the chromate resistant Aspergillus versicolor strain has been studied by atomic force- and transmission electron microscopies. The catalytic efficiencies of the oxidoreductase enzymes, e.g., horseradish peroxidase (HRP), were improved at the reverse micellar interface in presence of simple non-ionic surfactants. The inhibiting role of unsaturation on the activity of surface-active enzymes that overwhelms the activating effect of ‘space’ is observed at the interface of reverse micelles. Also, the role of headgroup size/hydrophilicity in controlling the catalytic efficiency of lipase was explored and it was found that it is the headgroup size that primarily regulates the lipase activity in micellar enzymology. A series of novel cationic amino acid as well as dipeptide based amphiphiles, by changing both the head group architecture and alkyl tail length of the amphiphiles, which are excellent gelator in plain water, has been developed. The structural effects of two cancer drugs on dsDNA were studied at the single molecule level. The trinuclear platinum cancer drug BBR3464 led to severe DNA aggregation while the antibiotic, antitumour nogalamycin, an anthracycline intercalator resulted in tight plectonemic supercoil formation. One mixed polymeric construct was developed for application in biosensing using the cantilever array platform technology. The applicability of scanning probe microscopy based methods in providing high-resolution structural information on protein structure was evaluated using ferritin protein and the iron core of the protein could be resolved. Research effort towards the functional study of non-muscle myosin II-C2 is under progress.

In the Inorganic Chemistry Department, a number of mixed valence complexes of iron, manganese and copper have been synthesised and characterised. They show interesting magnetic and electronic properties. For example, the copper variety displays NMR at room temperature and EPR at low temperature. Crystal engineering has been a major area of activities which include syntheses of various 1D, 2D and 3D coordination polymers. Studies in biological inorganic chemistry include interactions of inorganic/organic species with DNA. Syntheses and characterisations of complexes that mimic biological activities of various metallo enzymes are being pursued. One notable study in this area is abiological activation of molecular oxygen. Anion recognition, chemistry of heavier elements like Ru, Os etc. and design of various chemo-sensor have been other notable areas of research.

In the Organic Chemistry Department, the allelopathic sesquiterpenes heliannuols and helianane have been accomplished employing by ring closing metathesis. Advanced intermediate for the bioactive sesquiterpenes, dihydrocalamene have been accomplished by the cleavage of a cyclopropane ring in a cyclpropane fused benzoxepane ring system. A total synthesis of alboatrin, a phytotoxic metabolite IACS ANNUAL REPORT 2007-08  25 has been accomplished by intramolecular ketene-alkene cycloaddition followed by an oxidative ring enlargement. An enantiodivergent approach to the synthesis of both enantiomers of epi-nor- candensolide, nor-canadensolide and canadensolide has been developed. A novel approach using a domino metathesis sequence involving ROM-RCM-CM has been developed to construct densely functionalised ring systems present in anticancer diterpene umbellactal. Titanocene(III) chloride mediated radical-induced synthesis of C-3 substituted 3,4-dihydroisocoumarins has been achieved including a natural product Hydrangenol. Synthesis of 7- and 8-membered cyclic ethers by radical cyclizations has been accomplished. Ionic liquids have been used as catalyst for the synthesis of highly substituted pyridines, dithiocarbamates and cleavage of aziridines and epoxides, and halogenations of carbonyl compounds. Metal nanoparticles have been exploited for catalysis in Heck reaction, Tsuji- Trost reaction, aryl-sulfur bond formation and Hiyama coupling. A sodium bromide/bromate couple has been used as a green brominating agent for stereoselective bromination of alkynes and alkenes. Allylindium reagents have been used for the synthesis of terminal alkynes and trisubstituted alkenes by coupling reaction. A mild and efficient chemoselective deprotection of acetonides of diacetone glucose derivatives and deprotection of cyclohexyl protected diols have been developed using CAN. A mild and efficient methodology for the preparation of a-methylene-g-butyrolactones has been developed via titanocene(III) chloride promoted radical reaction. A carbohydrate-based synthesis of both cis- and trans-fused bicylic ethers has been achieved. a-Dehydro-b-amino esters have been synthesized from Baylis-Hillman adducts catalyzed by CAN.

The usual ketene formation was observed from (7-oxobicyclo[2.2.2]oct-2-ene-2,3-diyl) bis(phenylmethanone) derivatives on irradiation by photoinduced electron transfer mechanism. Quantum chain process for one of the photoproducts was identified from the photoreactions of rigid d-keto-b,g-enones. Electron transfer reaction from naphthyl anlogue of chalcones has been used successfully to prepare copper nanoparticles.

Functional monolayers have been created on gold, silica or glass surfaces using alkene metathesis or ‘click’ chemistry to introduce a Fischer carbene moiety on the exposed terminus. Such a surface readily immobilizes protein and other biologically relevant molecules through a covalent linkage mediated by the organometallic functional group.

In the Physical Chemistry Department, the weak molecular interactions and energy re-distribution are studied using dispersed fluorescence spectra in a supersonic jet. Extended Born-Oppenheimer theory is applied to elucidate photo-dissociation and molecule surface scattering. Parallel Genetic Algorithm based methodology has been developed to obtain single particle density in polythiophenes. A theory of temperature compensation of Circadian rhythms has been developed. Magnetic field effect on electron transfer in a reverse micelle has been shown to involve mutiple exciplexes. Femtosecond dynamics in different regions of an organized assembly is studied through excitation wavelength dependence.

In the Polymer Science Unit, the Poly(3- thiophene acetic acid) – ds DNA and poly(o-methoxy aniline) RNA hybrids are prepared, the former system exhibit a slow aggregation of the polymer on DNA surface and the later system exhibit slow uncoiling of POMA chain on RNA surface. The kinetic results of riboflavine-melamine gel indicate three steps for the hydrogel formation: (i) supra molecular complexation between riboflavine and melamine, (ii) conformotional ordering of the R-M complex and (III) aggregation of the complex to produce fibrils which entrap water producing hydrogels. Thin films of poly(3-hexyl thiophene)- Ag nanocomposites are prepared, while thin films of pure hexadecyl amine capped silver nanoparticles exhibit switching behavior, the nanocomposite thin films exhibit characteristics of light emitting diode. The rheology of PANI-CSA- m-cresol gel and its nanocomposite 26  IACS ANNUAL REPORT 2007-08 with MMT clay indicates that the shear viscosity exhibits Newtonian behavior for low shear rate and power law variation for higher shear rate. Hybrids of polyhedral oligomeric silsesquioxane (POSS) and polymer (such as PMMA, polystyrene, PBzMA) have been prepared by using thiol-mediated polymerization and ionic polymerization techniques from the surface of the POSS moiety. Polygonal gold and dendritic silver nanostructures have been prepared by modified citrate reduction technique. These metal nanostructures were successfully used as effective catalysts towards the borohydride reduction of p-nitrophenols and aerobic oxidation of different hexoses. A series of newly deigned redox active amphiphiles containing either tyrosine or tryptophan residue of varying carbon chain length have been synthesized and were used to generate gold and silver nanoparticles by an in situ reduction approach at basic pH.

The Raman Center for Atomic Molecular and optical Sciences is a newly formed collaborative platform at IACS. Its primary objective is to develop a world class research center on AMO sciences. Presently it comprises of two members and six associates across different departments having project proposals involving modern techniques in AMO sciences. These proposals are inter-dependent and involve expertise of more than one member and cover the following areas: (i) Many body theory and its application to atoms and molecules: Multi-electron systems are computationally hard problem to solve. Single or multi-reference coupled cluster theory is a unique technique to address this problem to a large extent. This technique along with appropriate relativistic corrections can address some of the most exciting puzzles of AMO sciences these days like the emergence of electric dipole moment of electrons due to CP violation which may manifest a small EDM in non-polar molecules. The requirement of enforcing gauge invariance and the increase in computational demand, which increases manifold if the systems require multi-reference description, create problems. There is also a delicate interplay of correlation and relativistic effects that needed to be adequately taken care of. These problems pose real challenge to a theoretician (for developing methodologies or formalisms) and computational chemists (for implementation of the theoretical methods) alike, and need to be targeted in a coordinated manner; (ii) Single and isolated cold ion spectroscopy: A consolidated effort in understanding the many electron correlations in a heavy atomic system like barium can lead us to understand the electroweak interaction at low energies. We envisage performing quadrupole moment measurement of singly charged barium ion with a percent precision which can then be compared to the values obtained with rigorous many-body couple cluster theory. This will ensure good choice of basis wave functions required for the calculation on parity non-conservation (PNC) in such heavy systems. In future we plan to carry out such measurements as well; (iii) Many body approach to Bose Einstein Condensates: Strongly interacting or strongly correlated system is another challenge for today’s atomic theory. Within RCAMOS, we are developing a mechanism to tackle this problem using coupled cluster technique. This will eventually lead to a microscopic theory for BEC-BCS crossover; (iv) Controlled dynamics using ultra- fast light pulse: Electromagnetic fields can be used successfully for the controlled implementation of quantum material systems over a wide range of time and length scales. The light-matter interaction and its application for quantum control have emerged as an integral part of research in diverse areas including chemical dynamics. Lasers have provided experimentalists with a tool to enforce coherent control on the nuclear dynamics and optical properties of atoms and molecules. Close cooperation between theoreticians and experimentalists to design and evaluate novel schemes of coherent control could lead to breaking new ground in this area; (v) Precision spectroscopy of cold clusters: Clusters contain rich information about how quantum systems like atoms and molecules finally become solids. Our approach to investigate such systems is bi-folded: on one hand we perform high precision spectroscopy with a gas jet expansion setup while on the other hand we have experts to handle the IACS ANNUAL REPORT 2007-08  27 mean field theory for such large systems; (vi) Beyond adiabatic approximation: The chemical reactions involve bond breaking and bond making. The asymptotic regions of potential energy surfaces are important in such events. In these regions, the adiabatic approximation breaks down and crossing and anti-crossing begin to dominate. In such a scenario, chemical reactions in the ground adiabatic electronic state may be strangely and strongly influenced by the presence of conical intersection with upper adiabats. The understanding of such phenomena is incomplete as yet. As reactive scattering cross sections at appropriate energies and resolution become available, their analysis and interpretation would pose a formidable challenge to the theoretician to develop computationally most effective and analytically elegant techniques of following the dynamics semiclassically or quantum mechanically. The area, in general, is rich in phenomena and possibilities and deservers close attention. We have recently added fresh expertise in these areas to begin with, which may be supplemented later as the centre grows; (vii) Quantum dissipative systems: Close relation between bath and a quantum system leads to de-coherences. But in practice they exist and hence we don’t observe quantum phenomena in macroscopic objects. A deep insight into this relationship will lead to improvements on possible quantum devices namely quantum gates, repeaters etc. We are working on such systems in order to understand in a more general way the process of quantum dissipative systems. During the year we have submitted a proposal to the Department of Science and Technology under the IRHPA scheme. At the same time we have started functioning in a more collaborative platform having close ties with other theory as well as experimental groups’ world wide. Among other important academic activities of the center, this year we had organized one international symposium on AMO sciences and one national workshop on quantum information science. RCAMOS organizes weekly seminars on different aspects of AMO sciences where experts from all over the world participate (A comprehensive list may be found at the RCAMOS website).

In the Centre for Renewable Energy Sources, the Double junction (10 cm x 10 cm) thin film silicon solar modules have been fabricated using Multichamber deposition system. Attempts are being made to develop large area (1’x 1’) microcrystalline silicon layers in order to apply this more stable material in thin film solar modules. The technology developed for amorphous silicon solar modules has been transferred to M/S Hind High Vac. Co. Pvt. Ltd. Bangalore.

Carbon nanotubes have been synthesized by catalytic decomposition of turpentine oil using Ni nanocatalyst. The objective is to use it for low cost fuel cell electrodes. Transparent Polymer-like a-C and diamond like carbon films have been developed by CVD for application as antireflection coating in solar cells.

In the Centre for Advanced Materials (CAM), the major research activities of our group are in the field of strongly correlated electron systems and semiconductor nanoparticles in the quantum confinement regime. We are actively involved in studying the electronic, magnetic and dielectric properties of different materials such as manganites, double perovskites, dilute magnetic semiconductors and also multiferroics, both experimentally as well as theoretically. There are serious attempts to discover new useful multiferroic and dielectric materials and also to understand the nature of unusual magnetic responses in comparatively uncorrelated 4d materials. Our group is also particularly active in understanding various aspects of doping, optical properties, and growth mechanisms of various nanoparticles in the nanometric size regime using the so-called bottom-up approach. Our recent results on doped nanomaterials provide important insight in understanding the universal nature of doping and ion solubility in a material matrix.

Achievement during the year 28  IACS ANNUAL REPORT 2007-08

Projects

Investigator In-Charge Title Grant Recd Expenditure (Lakh) (Lakh)

CSIR 01 Dr. S Giri Transition……….Chemistry thereof 1.5 2.65 02 Prof. D Das Silicon…………….Characrerisation 2.25 2.53 03 Prof. B C Ranu Newer Indium……..Transformation —— 2.81 04 Prof. M Chowdhury Studies…………….……….Ligands 1.5 1.55 05 Prof. K Bhattacharya Probing……..Ultrafast Spectroscopy 1.5 2.56 06 Prof. S K Dey Electrical……………….Electrolytes 1.0 0.86 07 Prof. B P Chatterjee Chitasanase…………………Lectins 0.62 0.39 08 Prof. A J Pal Photodetector………Semiconductor 0.8 3.89 09 Prof. T Chakraborty Iso………………………….Cluster 2.39 2.28 10 Prof. S Chowdhury Synthesis……………….Application ——- 0.23 11 Prof. B K Chaudhury Study………………..Liquid Crystal 2.17 2.10 12 Dr. D Basak Studies on ……………...Thin Films 7.30 4.39 13 Prof. P Chatterjee Development………..Hit Solar Cells 1.93 2.20 14 Prof. P Banerjee Radical………………….Complexes 1.5 2.95 15 Prof. A Sarkar Pyrazole…………………..Synthesis 1.5 1.43 16 Prof. M Ray Understanding……...Phosporylation 4.52 3.3 17 Prof. T Ganguly Effects………………..Enviornment 0.05 0.48 18 Prof. A K Nandy Studies ………….Nano Composites 2.48 2.37 19 Prof. B M Mondal Fast Atom…………….Temperature ——- 1.02 20 Dr. S Giri Synthesis…….. ……..Nanoparticles 3.05 2.46 21 Dr. P K Das Reversed………………Bio Catalyst 0.33 0.31 22 Dr. A K Das AB Initio……… ………...Molecule 0.47 0.55 23 Dr. S Majumdar Low ………………………...Alloys 6.6 6.0 24 Dr. T K Mondal Polymer…………….Nano Particles 5.82 0.43 25 Prof. A Ghosh Study……….. ……Nanocomposite 6.85 ——- DST 01 Prof. D D Sarma 2007316 XAS and XMCD 0.65 0.4 02 Prof. K Bhattacharya Femtosecond………Nanomaterials 90.0 79.8 03 Dr. S Giri Study of…………………..Magnet ——- 0.18 04 Dr. T K Mondal Peptide………………….Assembly 3.37 1.70 IACS ANNUAL REPORT 2007-08  29

Investigator In-Charge Title Grant Recd Expenditure (Lakh) (Lakh)

05 Dr. R Ganguly Towards ………………..Assembly 0.20 —— 06 Dr. M Ghosh Synthesis…………………..agents 3.5 4.2 07 Prof. P Chowdhury Development…………….Facility 29.8 —— 08 Prof. M Ray Biosofting………………….Fibre 4.9 1.5 09 Prof. A K Barua ADA/Post Coating……..Division 24.0 16.18 10 Dr. A J Pal Samsung Project —— 0.45 11 Prof. A K Barua Fine tuning…………….Canopy —— 2.15 12 Dr. T Chakraborty Ramanna Fellowship 11.6 4.32 13 Prof. S Ray Development…………Solar Cell 3.0 12.17 14 Prof. P K Mukherjee Application ……. …Diagonestics 0.59 —— 15 Prof. A Ghosh Development ………Technology —— 4.82 16 Prof. A J Pal Ramanna Fellowship 11.6 1.73 17 Dr. R Mondal Synthesis ………….. Framework 11.5 4.23 18 Prof. P Chatterjee Optimization ………. Modeling —— 2.75 19 Dr. A Bhowmik Ramanna Fellowship 11.6 10.3 20 Prof. D Das Development…….CVD 6.0 6.66 21 Dr. P K Das Ramanna Fellowship 11.6 11.2 22 Prof. S Ray High Resolution…….Application 8.0 4.36 23 Prof. S Goswami Design………………Application 10.0 3.56 24 Prof. S Ghosh Ramanna Fellowship —— 11.15 25 Prof. G P Das CRP/Spintronic……….Materials —— 6.79 26 Prof. S Lahiri Exploring……………Limitation 15.0 3.97 27 Prof. D D Sarma CRP/Preparation ……..Materials —— 6.25 28 Dr. R Mukhopadhyay Structural…………………..Tool 12.5 13.0 29 Prof. A S Ghosh Alom-Atom……………… Limit —— 0.43 30 Prof. A Sarkar Organo metallic…………Surface 25.0 4.30 31 Prof. D D Sarma J C Bose Fellowship 8.0 8.41 32 Prof. D Chakraborty Mtech Programme 8.75 3.30 33 Prof. M Ray NRDC/New anticancer….compound —— 4.14 34 Prof. A J Pal Photovoltaic…………...Layerby layer —— 0.12 35 Prof. G B Talapatra Development ……………Technique 1.1 — 36 Prof. B C Ranu Expert Committee Meeting 6.8 4.2 37 Dr. S Majumdar Low ………………………… Oxide 5.7 0.03 38 Prof. S Choudhury Preparation ………………MOCVD —— 0.03 39 Prof. A K Pal Development of LPG Sensor 1.36 0.33 40 Prof. M Ray LIPL Agreement 7.0 2.68 41 Dr. T Chakraborty Photolession ………………...Guide —— 41.62 42 Prof. A Chakraborty Chemistry………...Metal complexes 3.0 1.39 30  IACS ANNUAL REPORT 2007-08

Investigator In-Charge Title Grant Recd Expenditure (Lakh) (Lakh)

43 Prof. D Mukherjee J C Bose Fellowship 8.0 1.39 44 Dr. A Patra Decay………………….Application —— 41.5 45 Dr. S K Saha Preparation…………….Nano-wire ——- 11.53 46 Prof. K Bhattacharya J C Bose Fellowship 8.0 7.17 47 Prof. D Chakraborty INSA Senior Scientist —— 0.65 48 Prof. D D Sarma INDO-JAPAN workshop ——- 1.62 49 Prof. A K Barua WBRDA/Comparism………System ——- 0.25 50 Prof. S P Bhattacharya Developing …………….Calculation 4.0 1.98 51 Prof. T Ganguly Electrochemical …….. …..Materials 4.5 4.26 52 Prof. D Chakraborty UNANST Project 224.0 114.30 53 Prof. P Choudhury Silicon…….. ………….Application ——- 1.66 54 Prof. B P Chatterjee Biochemical……………….Proteins ——- 1.6 55 Dr. D Basak Studies on…………….. Thin Films 0.42 0.19 56 Prof. A K Nandy Studies on …………..Their Blames 3.5 5.52 57 Dr. P K Das Effects …………………….System ——- 0.54 58 Dr. A Patra Ramanujan Fellowship 11.6 8.29 59 Prof. P K Mukherjee Spectroscopy ………………Plasma 1.5 1.82 60 Prof. P K Mukherjee Spectroscopy………..Enviornment 1.0 0.64 61 Prof. A K Barua TIFAC-IACS Project —— 0.20 62 Prof. A K Barua Optimization ………..Windshield ——- 0.47 63 Dr. T K Paine Design ………………. Oxidation 3.0 1.53 64 Prof. S C Ray Asymetric ………..Radical source —— 8.77 65 Prof. D D Sarma Centre for Nano-Technology 265.00 158.08 66 Prof. B C Ranu Non-Hazards……….Application ——- 6.51 67 Dr. S Mukhopadhyay Dsymmetric…………..Complex 6.42 2.38 68 Prof. M Ray Understanding ……………Acid ——- 15.72 69 Dr. B Das Theoretical …………Conductance 7.68 5.38 70 Prof. R V Venkateswaran Synthesis……………….Substance 5.0 10.18 71 Prof. P Choudhury Technology ………. …..Industries 27.98 23.99 72 Dr. R Chatterjee Isolation ………………….Extract 3.5 3.49 73 Prof. M Chaudhury(Jointly) National Single Crystal —— 125.12 74 Prof. S Ray Metal induced………….Solar Cell 16.57 1.1 75 Dr. P Dastidar Supramolecule………..Framework 4.0 3.04 76 Dr. D Basak Investigation…………..Technique 46.0 4.75 77 Prof. D D Sarma INDO-JAPAN Project 4.75 4.75 78 Dr. S Giri Mossbauer……………..Materials 43.0 12.42 79 Prof. D D Sarma Development…………..Polutent 1.65 1.65 IACS ANNUAL REPORT 2007-08  31

Journal and Services

INDIAN JOURNAL OF PHYSICS

INTERNATIONAL ADVISORY BOARD - 2007

G S Agarwal J V Narlikar R J H Clark P Rama Rao K Lal K L Chopra E S Rajagopal P K Kaw S P Sen Gupta D Mukherjee S K Joshi Ashok Sen R A Mashelkar D Chakravorty V S Ramamurthy Haim Levanon A K Barua T V Ramakrishnan Gurudas Ganguly C N R Rao

BOARD OF EDITORS - 2007

S M Bhattacharjee G P Das J K Datta Gupta D S Ray A Rai Choudhuri B K Chakrabarti Asok Sen N V Madhusudana Avijit Sen Prabir Roy A Raychaudhuri B G Ghosh S K Chakrabarti R K Moitra Indrani Bose S P Bhattacharyya S Kailas A K Raychaudhuri T P Singh S Chakravorty P K Mukherjee

J K Bhattacharjee, Editor-in-Chief & Honorary Secretary

Articles Published (during January to December, 2007) in Volume 81 of Indian Journal of Physics and Volume 90 of Proceedings of Indian Association for the Cultivation of Science

Sl. No. Articles Indian Foreign Total

1. Reviews 6 x 6 2. Rapid Communications x x x 3. Full Papers 106 13 119 4. Notes 6 1 7 5. Conference Proceedings1 24 x 24 6. Special Issue2 16 × 16

Total No. of Articles 158 14 172

Total No. of Issues: 11* Total No. of Printed Pages 1,360

Fields:

Astrophysics, Atmospheric & Space Physics; Atomic & Molecular Physics; Biophysics; Condensed Matter & Materials Physics; General & Interdisciplinary Physics; Nonlinear Dynamic & Complex Systems; Nuclear Physics; Optics & Spectroscopy; Particle Physics; Plasma Physics; Relativity & Cosmology; Statistical Physics 32  IACS ANNUAL REPORT 2007-08

Foreign Contributors:

Azerbijan, Bangladesh, Brazil, Egypt, Iran, Iraq and Turkey

Articles Received:

Altogether 119 Nos Articles (Regular: 78 Nos, Proceedings: 24 Nos) have been received of which 14 Nos are Foreign Contributions.

Conferences/Proceedings:

1 Proceedings of the Symposium on Condensed Matter Days – 2005 (CMDAYS-05) organized by the Department of Physics, Berhampur University, Berhampur – 760 007, Orissa, India held at the St. Vincent Retreat at Gopalpur on-sea, India during August 29-31, 2005 [Published in January, 2007 p.1-178]

Significant Articles Published:

A. Review Articles

(i) Wave propagation phenomena in troposphere : Indian experience S K Sarkar [Published in February, 2007, p.189- 215]

(ii) Blue jet models and associated lightning flashes R Bhattacharya, R Das, R Guha, S De and A B Bhattacharya [Published in August, 2007, p.757-766]

(iii) An introduction to nonlinear oscillators: a pedagogical review J K Bhattacharjee, A K Mallik and Sagar Chakraborty [Published in November, 2007, p.1115-1175]

(iv) Diffusion and mobility driven instabilities in a reaction-diffusion system: a review Syed Shahed Riaz and Deb Shankar Ray [Published in November, 2007 p.1177-1204]

(v) Rhombic patterns near a bicritical point in periodically forced surface waves Krishna Kumar, Supriyo Paul and Dharmesh Jain [Published in November, 2007 p.1205-1214]

(vi) The effect of magnetic field on wavy roll instability Pinaki Pal and Krishna Kumar [Published in November, 2007, p.1215-1226]

B. Special Articles

(i) 2 Special issue on Atomic and Molecular Physics – Part I [Published in September, 2007 p.841-956] IACS ANNUAL REPORT 2007-08  33

(ii) 2 Special issue on Atomic and Molecular Physics – Part II [Published in October, 2007 p.957-1104]

Circulation:

56 Nos. through exchange, 343 Nos. sale in India, 24 Nos. sale in Foreign Countries (such as Australia, Austria, Bangladesh, Brazil, Canada, France, Germany, Holland, Italy, Russia, Sri Lanka, Switzerland Turkey, U.K., U.S.A. etc.) and 123 Nos. Complimentary copies for users of different Institutions in India and abroad. The sale proceeds during the year amount to Rs.19.93 Lakhs (approx) including exchange copies.

LIBRARY

Introduction

The IACS library is one of the oldest libraries in the Indian subcontinent. It has vast collection of volumes for reference and research especially in the field of natural /pure science. The library has multifarious repository of valuable reference materials and bound volumes of journals, some dating back to 1600 s.

In addition to these, the library also has rare books, modern resources such as online/offline databases and non book materials etc. The library strives to serve its internal as well as external members to the best of its ability.

Library Hours : Monday to Friday 09.30 am to 07.00 pm Saturday 11.00 am to 05.00 pm

Some major events of the year:

 Library has procured 40 nos. Wiley E. Books  Back File : American Chemical Society Legacy Archives Royal Society of Chemistry Archives  Wiley: Angewandte Chemie, Mat.Sc. and Polymer Science  Library has Added One HP Scan Jet 7800 Model Scanner with color resolution and Duplex Scanning  One Konica Minolta Digital Photocopier machine with interface Scanner  The library has created wooden fumigation chamber for protection of books/journals from the fungus and books insects  Two issues of Bi-annual IACS Library Newsletter have been Published and third issue of the same in the press.

 Some Vital Statistics of the Library:

a) Total nos. of Books & Journals : 76,847

b) Total nos. of Journals received (Print) Subscription / Exchange/ Complementary) : 148

c) Total nos. of Journals having 34  IACS ANNUAL REPORT 2007-08

on-line access (Incl. full text e- resources) : 646

d) Total nos. of Books/Serials & Standards added : 527

e) Non-book materials added (CD–ROM) : 55

f) Circulation of Books & Serials/nos. of borrowers : 812/515

g) Circulation of Journals/nos. of borrowers : 67/42

h) New members enrolled : 155

i) Nos. of nonmembers/visitors : 55

j) Reprographic services (nos. of copies) : 87,109

CENTRAL SCIENTIFIC SERVICES

During the year under review, this department rendered service to research workers of this Institute as well as to other Institutes utilizing the capacities of its centralized Instruments for their respective facilities :

UVISEL ELLIPSOMETER (HORIBA JOBIN YVON) Model: HR 460 FUV AGAS

In charge : Prof. A J Pal (Solid State Physics) Operator : S K Das Operation : 285 samples (internal) and 4 samples (external) Charge realised : Rs. 3,200/- Internal users : ERU, SSP, Spectroscopy, MS External users : IIT-Kharagpur, CGCRI

2. CARBON, HYDROGEN, NITROGEN ANALYSER 2400 SERIES II (old), Perkin Elmer CARBON, HYDROGEN, NITROGEN, SULPHUR ANALYSER 2400 Series (new), Perkin Elmer

In charge : Prof. N Ray Choudhuri (retd.), & Prof P Banerjee (Inorganic Chemistry) Operator : B Pathak Operation : 1979 samples (internal) and 188 samples (external) Charge realised : Rs. 1,01,200/- Internal users : IC, OC, BC, PSU, MS, PC, SSP, Spectroscopy, MLS Unit External users : JU, CU, KU, NBU, ASU, NBU, IIT (Kharagpur, Kanpur, Delhi), IICB, CGCRI, IISc., Bangalore /NSE College, Chittagang Univertsity, CNCI /Chemgen Pharma/ Techno Wax chem, /Chembiotech, Auropol etc.

3. PICOAMMETER (Keithley 486)

In charge : Dr. A J Pal (Solid State Physics) Operation : Being used in a current voltage setup for Routine work

4. FT-NMR: BRUKER DPX-300 MHz NMR SPECTROMETER IACS ANNUAL REPORT 2007-08  35

In-charge : Prof. R V Venkateswaran (Organic Chemistry) Operators : Sachin Das & Sumit Ray Service : 8127 samples were analyzed Charge realised : Rs 6,150/- External users : OC, IC, PSU, BC, PC, MS External users : CU, JU, KU, CMERI-Durgapur, Aurora Mathey

5. MICROMASS Q -TOF HIGH RESOLUTION MASS SPECTROMETER (HRMS)

In charge : Prof. R V Venkateswaran (Organic Chemistry) Operator : Swapan Kumar Sarkar and Gautam Biswas Operation : 3351 samples were analysed Charge realized : Rs. 81,500/- Internal users : OC, IC, BC, PC, PSU, MS External users : BESU, Bose Institute, CU, JU, North Bengal University, Kalyani University/ R.K.M. College, IIT-Kharagpur, IIT-Gauhati, Presidency College, Calcutta, HPI, Sikkim, College of Pharmaceutical Sciences, Orissa

6. FTIR: NICOLET MAGNA - IR 750 SYSTEM

In charge : Prof. S K Roy (Spectroscopy) Operator : A K Banerjee Operation : 394 samples (internal) and 22 samples (external) Charge realised : Rs. 6,600/- Internal users : Spectroscopy, MS, SSP, PSU, ERU, MLS, BC, CRES External users : JU, CU, Bankura Christian College, CPTAHS, Howrah

7. OPTICAL MICROSCOPE AND MICROHARDNESS TESTER

Incharge : Prof. Tanusree Kar (Material Science) Operators : Sipra Ghosh / Scholars Operation : 16 samples (internal) and 6 samples (external)

The above instruments was installed on 3.3.08

8. PHYSICAL PROPERTY MEASUREMENT SYSTEM (PPMS)

In charge : Prof. S K De (Materials Science) Operator : S Khatua Operation : Run time 4508 hours, 133 Samples Users : MS, SSP, MLS Unit, Spectroscopy, IC, OC, PSU

9. TIME-CORRELATED SINGLE PHOTON COUNTING (HORIBA JOBIN YVON FLUOROCUBE) 36  IACS ANNUAL REPORT 2007-08

Incharge : Prof. T Ganguly (Spectroscopy) & Prof. A Patra (Material Science) Operator : Subrata Das Operation : 852 samples including measurements of time dependent anisotropy and TRES Internal users : IC, Spectroscopy, MS, CAM, PC, PSU, MLS Unit, CRES Internal users : Calcutta University

10. XRD FACILITY (Rich. Seifert XRD 3000P)

In charge : Dr. D Basak, (Solid State Physics) Operator : S S Routh Operation : 740 samples (internal), 44 samples (external) Charge realised : Rs. 13,200/- Internal users : MS, SSP, PSU, ERU, MLS Unit, IC, OC, Spectroscopy, CAM, BC External users : Jadavpur University, IICB, BESU, CMRI, Dhanbad, SNBCBS, IIT, Kharagpur, Presidency College, Burdwan University

11. SWAX (Bruker D-8 Advanced X-Ray Diffractometer)

In-charge : Dr. A Bhaumik (Materials Science) Operator : B Mandal Operation : 1396 samples (internal) for 31 faculty members Users : MS, CAM, SSP, PSU, IC, OC, BC, MLS, Spectroscopy

12. PLN-106 & MNP 9/2 (Stirling India)

In-charge : Prof Saswati Lahiri (Organic Chemistry) Operator : R Hazra, S Saha, P Das, S K Singha, S Singharoy Operation : Production of liq. Nitrogen was 16,529 lit. (Internal) and 3510 lit. (External) Charge realised : Rs 1,19,343/- Internal users : MS, SSP, SP, OC, IC, ERU, PSU, BC, PC, CSS, MLS Unit External users : Chittaranjan National Cancer Institute, Different Departments of JU & CU, Ballygunj Sc. College, GSI, Allied Sc. Pdts., Ghoshdastidar Inst. for Fertility Research, A.I.Centre, CGCRI, IICB, Exide India Pvt. Ltd. R & D Centre, Repose Clinic & I. V. F. Centre, Molecular Reseach & Investigation Centre, Dr. B C Guha Centre for Genetic Eng. & Biotech. And many other local institute and laboratories

13. FE-SEM (JEOL)

In-charge : Prof. Swati Ray (ERU) and Dr. A Patra (Materials Science) Operators : C Chakraborty and S Maji Operation : 1356 samples were analyzed in total (Internal 1204 and External 152) Charge realised : Rs. 2,38,000/- Internal users : MS, SSP, Spectroscopy, BC, PC, OC, CAM, IC, PSU, ERU, MLS unit IACS ANNUAL REPORT 2007-08  37

External users : JU, CU, KU, BU, NU, IIT-Kharagpur, IICB, SNBCBS, VECC, TCS, Exide, Textile College, Ceramic College, BESU, Quaker India Ltd.

14. DIFFERENTIAL SCANNING CALORIMETER, (PYRIS DIAMOND DSC, PE)

In-charge : Dr. T K Mandal (PSU) Operator : N Naskar and C Bag Operation : 165 Samples Users : PSU, SSP, BC, MS, IC

15. LIGHT SCATTERING INSTRUMENT (DYNAMIC & STATIC) Model: BI-200SM, BIC Installation of the instrument was completed on 16/1/2008. The instrument was inaugurated on 12/3/2008.

In-charge : Dr. T K Mandal (PSU) Operator : C Bag Operation : 43 Samples Users : PSU, BC, MS, PC

16. CD SPECTROPOLARIMETER Model: J-815-150S (Jasco)

In-Charge : Dr. Prasanta K Das (Biological Chemistry) Operator : C K Das Operation : 534 Samples Charge realized : Rs. 3,000/- Internal users : PSU, IC, OC, Spectroscopy, BC, MS External user : Jadavpur University, IIT-Guwahati, Bose Institute

17. THERMAL ANALYZER (TA INSTRUMENTS Q 600 SDT simultaneous DSC TGA)

In-charge : Dr. Prodyut Ghosh (Inorganic Chemistry) Operator : Bholanath Mandal Operation : 189 samples (internal) and 2 samples (external) Charge realized : Rs. 3,000/- Internal users : IC, MS, SSP, MLS unit, PSU External user : Auropol India Pvt. Ltd.

18. Computer Centre

Incharge : Prof. S Ray Scientist-III : Dr. S Deoghuria

The Computer Centre at IACS is a central facility that provides services like Local Area Network (LAN), email, Internet and also computational facilities to the scholars and staff members. A major upgradation 38  IACS ANNUAL REPORT 2007-08 was done on all sorts of computational and infrastructural facilities available with the Computer Centre. Eight numbers of servers were procured to run email/web/ftp/proxy/dns and other services. All servers are connected to a common storage device through SAN switches. All servers/services are kept in fail-over mode for minimizing downtime. A 32 processor based powerful SMP hpc (IBM P 590) server was installed that is being extensively used for heavy number crunching/parallel computation. Two UPS systems were procured for servers and network accessories. One layer-four network switch, three layer-three network switches, sixteen layer-two network switches with one ASA firewall were installed for fully implementing VLAN network architecture in IACS campus. All systems are running on Redhat Enterprise Linux. Directory Access Protocol (LDAP) was implemented for seamless access to different services. Internet bandwidth was upgraded from 2 Mbps to 6 Mbps with fibre optic cable. Proposal for enhancing the existing bandwidth massively is in the pipeline for better accessing the e-resources, recently subscribed by IACS Library. This will also facilitate the online activities of India Journal of Physics. One Apple Mackintosh system was procured to study its usability and it was found that the system is quite efficient. Network security was enhanced through proxy and firewall. Antivirus/antispam software was procured and installed in all client machines of IACS. The Director officially inaugurated the upgraded facility including web-mail available with the Computer Centre on February 29, 2008. The extension of LAN is going on and already the new Directorate complex, Integrated Ph.D. section, Electrical Substation were covered. All users were given user-ids and passwords for accessing Internet and unauthorized access was totally stopped. Web design software was procured for introducing latest features in web content. is The indigenously created and designed website of IACS is being updated and maintained by the Computer centre. This Centre helped to build linux clusters in other departments for parallel computing for real life applications. It is the best service center in IACS with practically no downtime and all the services were available 24x7x365 days. All the user needs/ complaints were attended immediately and solved promptly. The resources are utilized and shared with users in best possible manner. Necessary training, help and consultations were provided to the users who needed them. A separate sitting arrangement was arranged for the faculty members of the Computer Centre. Renovation work was done in the Computer Centre. Some old computers were disposed off to create space for the new ones.

Some computers received under ICOSER project of DST in 1998 are still being used in the Computer Centre and it is one of the Level-III centres of the Country.

The performance of local area network (LAN) was satisfactory. Almost all rooms including laboratories are connected with LAN. The email and Internet facility have been extended to departmental offices and Administration including Accounts Section. Wireless LAN was implemented in seminar rooms, library and new Directorate complex.

The Computer Centre developed the computer programs for salary calculation of IACS staff and fellows and Accounts Section is still using those successfully. Income tax calculation and report generation programs were developed and related reports were printed by the Computer Centre. All sorts of help were provided to the staff of Project Section to process the salary of Project Section.

The website of IACS was maintained and updated. Essential information like advertisements for vacant positions of faculty/research fellows, tender notices was put on IACS Website from time to time. All academic activities like seminars/symposia, summer school were advertised in IACS Website well in advance and during the programmes. An archive for past events is maintained in IACS Website. The Homepage of Indian Physical Society was maintained in IACS Website. On-line service of Indian Journal IACS ANNUAL REPORT 2007-08  39 of Physics was being done by maintaining archives of contents and abstracts of present and previous issues of IJP as well as full text of articles published as Rapid Communication and Review articles in our Website with downloadable format.

WORKSHOP

The activities of workshop during the year 2007-08 in the following sections are appended below.

1. Mechanical- Total 404 nos. of job cards were received & turned out successfully. The jobs were machining & fabrication of various parts of research equipments & many indigenously developed mechanical fixtures related to various laboratory equipments. Cryostats were made & repairing of different special apparatus, machines, vacuum & other pumps etc. were carried out. 2. Refrigeration & Air-conditioning- Total 140 nos. of job cards were successfully executed during this period. Repairing of air-conditioners, refrigerators, water coolers were carried out. The air conditioning of MLS hall, Seminar room & library was maintained through AMC by M/S Voltas & M/S Blue Star respectively. 3. Glass Blowing- Total 1991 nos. of job cards were turned out successfully by repairing the various glass apparatus such as quartz apparatus, reaction vessels, R.B. flasks, all type condensers (Double wall condensers, coil condensers, liebig condensers) distillation units, distillation heads, syringe, pressure equalizers funnels, viscometers, manometers, oil baths, & fabrications of funnels, glass tubes, gas bubblers, beakers, Gas wash bottle, nozzles etc. were also carried out. Imported burners & tools were introduced for improving quality & scope in glass working. 4. Carpentry –Total 124 nos. of job cards were received & work done successfully. Fabrication of laboratory wooden fixtures & repairing of racks, boxes, tables, and tools Etc. was carried out. 5. Electrical –Total 1122 Nos of job cards were turned out successfully by maintaining power distribution lines, repairing & replacing electrical fittings etc in various departments. New Electrical installations of various departments were done as per requirements. Installation & Maintenance of lift through M/S OTIS was carried out satisfactorily. Proper arrangements were made for audio-visual & air-conditioning system in MLS hall &Seminar rooms. 6. Electronics Section –107 Nos. of job cards were executed successfully by indigenously making DC power supply low and high voltage range & repairing of High temperature Furnace, Temperature Controllers, High voltage signal amplifier, stabilizers, current injection IACS ANNUAL REPORT 2007-08  41

PART – B 42  IACS ANNUAL REPORT 2007-08 IACS ANNUAL REPORT 2007-08  43

DEPARTMENT OF MATERIALS SCIENCE

Samir Chandra Saha, Senior Professor Intense laser field molecular processes; Optical coherent control

Associates: (1) C Sarkar, SRF

Shib Shankar Bhattacharyya, Senior Professor Molecules in intense laser fields; Control and manipulation of atomic and molecular processes

Associates: (1) R Bhattacharya, SRF; (2) S Chatterjee, JRF (CSIR); (3) B Dutta (Part-time)

Gour Prasad Das, Senior Professor

Computational Materials Science; Density functional electronic structure of bulk and nanomaterials; Diluted magnetic semiconductors and other Spintronic materials; Complex hydrides and nanostructured materials for hydrogen storage

Associates: (1) S Ghosh, SRF; (2) S Barman, SRF; (3) S Bhattacharya, JRF (CSIR); (4) N Tandon, SRF (BRNS); (5) A Bhattacharya, JRF (BRNS)

Bhupendra Nath Dev, Senior Professor Surface and Nanoscale science; ion-beam modification of materials; X-ray physics; X-ray standing waves and reflectrometry; multilayers; Nanoscale magnetism; molecular beam epitaxy (MBE) growth of quantum structures; single-electron tunneling; morphology and electronic structures of clean single crystal surfaces and nanostructures grown on them

Associates: (1) R Batabyal, JRF; (2) S Patra, JRF

Tanusree Kar, Professor Synthesis; single crystal growth and characterization of nonlinear optical materials; crystal and molecular structure determination of natural and synthetic materials by X-ray diffraction analysis

Associates: (1) T Mallick, RA-I; (2) S Moitra, SRF; (3) S Seth (Part-time); (4) T Pal (collaborator); (5) K Bhattacharyya (collaborator)

Subodh Kumar De, Professor and Head Low Temperature Physics; Magnetic Nanostructures; Dilute magnetic semiconductors; Polymer electrolytes; Ferromagnetic Shape Memory Alloys

Associates: (1) S Karan, RA (CSIR); (2) S Biswas, SRF; (3) T Ghoshal, SRF (CSIR); (4) V Dev Ashok, SRF (CSIR); (5) K Das, SRF; (6) S Manna, JRF 44  IACS ANNUAL REPORT 2007-08

Amitava Patra, Assciate Professor Pure and doped nanomaterials; upconversion; energy transfer, size; shape and crystal phase; luminescency study

Associates: (1) P Ghosh, SRF; (2) S Sadhu, SRF (CSIR); (3) T Sen, JRF (CSIR); (4) K K Halder, JRF (CSIR), (5) P Saha Chowdhury, (DRDO); (6) A Kar, JRF (CSIR)

Asim Bhaumik, Associate Professor Microporous; mesoporous materials and related advanced materials: catalytic, ion-exchange; optical and gas storage applications

Associates: (1) D Chandra, SRF; (2) M Nandi, SRF (CSIR); (3) K Sarkar, SRF (CSIR); (4) S K Das, SRF (CSIR); (5) M Paul, SRF (CSIR); (6) N Pal, JRF (CSIR)

Bimalendu Deb, Associate Professor Theoretical Atomic; Molecular and Optical Physics

Associates: J Hazra, JRF

Shyamal Kumar Saha, Associate Professor Electrical properties of low dimensional organic semiconductors; Electro-deposited metal (viz. Ag, Ni) nanowires and synthesis of materials for fabrication of organic solar cell and light emitting diodes

Associates: (1) S Das, RA; (2) D Majumdar, JRF (CSIR); (3) B Mondal, JRF (CSIR); (4) J Datta, JRF; (5) U Das, SRF

Sugata Ray, Assistant Professor Mechanism of tunneling magnetoresistance in double perovskites research on multiferroics; dilute magnetic semiconductors; single crystal growth and characterization

Associates: (1) S Middey, JRF (CSIR); (2) S Jana, JRF (CSIR); (3) T Chakraborty, JRF

Narayan Pradhan, Assistant Professor Colloidal synthesis of nanomaterials

Associates: (1) N S Karan, JRF (CSIR); (2) B B Srivastav (CSIR); (3) S Jana, JRF (CSIR); (4) S Sengupta, JRF

1.1 Selective population transfer to excited vibrational-rotational levels of diatomics by stimulated hyper-Raman nonadiabatic passage

S S Bhattacharyya and S Saha

We have clarified the essential nonadiabaticity of the proposed mechanism of the very convenient and efficient method of highly selective population transfer to higher vibrational levels2 ofH by (2+2)-photon stimulated hyper-Raman process which has been calculated within the framework of the density matrix theory. Chirped pulses have been shown to be crucial for the process. Optimum temporal pulse widths and chirping rates have been also computed and the designed pulses interpreted IACS ANNUAL REPORT 2007-08  45

for the more challenging problem of population transfer process in Li2 dimer taking into account all possible rotational effects and decoherences which may inhibit such transfer. A paper incorporating these conclusions has already been communicated.

1.2 Simulation of real time pump-probe spectroscopy by ultra fast laser pulses

S S Bhattacharyya and S Saha

We have continued our calculation of the wavepacket dynamics on potential surfaces of diatomic molecules strongly coupled by a series of femtosecond laser pulses. This method, earlier applied to the alkali dimer Li2, with the two lowest potential surfaces X and A, is now being extended to more than two coupled electronic states (e.g., X, A and E in a ladder configuration). Parallely, time dependent populations of three electronic states (X, B and C), and their vibrational distributions under differing conditions of pulse times, intensities, frequencies and, most importantly, the delay between the pulses, are being studied in the case of H2.

1.3 Wavepacket and close-coupling studies of dissociation of the polar diatomic HD+ by near IR pulses

S S Bhattacharyya

A complete study of the time-dependent dynamics of the nuclear wavepacket during multiphoton dissociation of the simplest polar diatomic ion HD+, under the influence of short femtosecond IR pulses ranging from 5 to 75 fs, has been made for a large range of intensities. The calculations were made for different pulse shapes at two different central laser frequencies corresponding to Ti-sapphire and Nd-YAG lasers. Differing initial vibrational levels were also used. The investigations involve the dependence of the total dissociation probability per pulse, the branching to various atomic (ionic) states, and the kinetic energy distribution of the photofragments on pulse time, intensity, frequency, pulse shape and initial vibrational level. The roles of the intrinsic dipole moment and the nonadiabatic terms in the process, and the influence of the career-envelope phase have also been explored. A paper incorporating results obtained and their interpretation is being prepared for communication.

We are also investigating the solutions of the time-independent close-coupling equations for the same system, for the same frequencies and different range of intensities for characterizing the laser induced dressed states.

+ 1.4 High harmonic generation in H2

S Saha

+ The Hermitian Floquet approach to the high harmonic generation in H2 has now been reformulated in the velocity gauge. Various schemes of extending the power spectrum, expressed as the squared Fourier transform of the time-dependent expectation value of the dipole moment of the molecular system, to higher harmonic frequencies, can hopefully, be more easily implemented.

2.1 Electronic structure and magnetism in Cr doped CdS clusters

G P Das

Quantum size effects on diluted magnetic semiconductors have been investigated using first-principles density functional calculations on Cr-doped CdS clusters. Starting from the ground state properties 46  IACS ANNUAL REPORT 2007-08

of pure (CdS)n clusters (n=1,14), we have systematically doped Cr atoms (both mono- and bi-doped) substitutionally, endohedrally and exohedrally. While Cd12S12 is a highly symmetric cage-like polyhedron consisting of alternate 4- and 6-membered rings connecting Cd and S ions, Cd13S13 is found to be stable in a core-cage structure. On introduction of a transition metal dopant like Cr in the Cd12S12 cluster, the ferromagnetic alignment seems to be favoured for exohedral substitution. However, the lowest energy structure corresponding to substitutional CrCd, turns out to be antiferromagnetic.

2.2 Ti-decorated Si60H60 fullerene cage : a possible Hydrogen storage medium

G P Das

From first-principles density functional electronic structure calculations, we show that Si60H60 forms a highly symmetric (meta-)stable fullerene structure on which Ti atoms can be capped exohedrally in cationic form enabling storage of hydrogen in molecular state. While the H atoms on a Si60H60cage saturate the Si dangling bonds, the Ti+ ion sitting on the energetically favorable hexagonal face of the Si60H60fullerene allows H2 molecules to be attached with binding energy intermediate between physisorption and chemisorption. Model calculations on a Ti@Si6H6 cluster reveal that each Ti atom can absorb up to 4 H2 molecules with an energy gain of 0.26 eV/H2. Further work is in progress to investigate how to avoid Ti-dimerization on Si60H60 surface by doping it with Phosphorus.

2.3 Structural and thermodynamic properties of Ca and Mg doped Lithium Imide

G P Das

Binary and Ternary imides of Lithium undergo reversible hydrogenation reaction and have high potentiality for storage of hydrogen in molecular form. These light metal hydrides satisfy several criteria like high storage capacity, satisfactory kinetics and optimal thermodynamics. In an attempt to tailor the dehydrogenation temperature of lithium imides, we have investigated the ternary imide Li2Ca(NH)2 + - and Li2Mg(NH)2 where the strength of interaction between Li cation and [NH2] anion can be tuned in such a way that the desorption kinetics can be improved. First principles density functional calculations yield the stable ground state structure along with the correct hydrogen positions. Compared with the structural and thermodynamic data of the pure lithium imides, these ternary imides with partial Ca or Mg substitution show decreased reaction enthalpies and also reduced dehydrogenation temperatures that are desirable.

3.1 Electronic structure of Ag-adsorbed nanowire-like stripes on Si(110)-(16x2) reconstructed surfaces

B N Dev

The surface morphology and electronic structure of an ultrathin Ag film (1/8 monolayer) deposited under ultrahigh vacuum condition on Si(110)-(16x2) surfaces were studied by in situ scanning tunneling microscopy and scanning tunneling spectroscopy (STS). Local density of states, obtained from our STS data, reveal that after Ag deposition, the band gap of the surface has increased compared to the bulk Si band gap of 1.1 eV. In addition, the band offset and appearance of new electronic states within the band gap are observed. We have made an attempt to understand these results by a one-dimensional (1D) tight binding model calculation. Si(110)-(16x2) surface has nanowire-like stripes, where the separation between stripes is ~ 5 nm. We initially ignore the interaction between these stripes and treat a stripe as a one-dimensional (1D) system. We have carried out a 1D tight-binding model calculation by considering various modified chains. In theoretical analysis of the model, real space renormalization technique and IACS ANNUAL REPORT 2007-08  47

Green’s function approach are adopted. The results obtained from the 1D model are consistent with the observed features in the local density of states. Scanning tunneling spectroscopy results obtained on the stripes of the Si(110)-(16x2) structures following a low-coverage Ag deposition show the following features: (i) band gap broadening, (ii) band gap variation, (iii) band offset, and (iv) appearance of new electronic states within the band gap. Our model qualitatively explains these features.

3.2 Coexistent compressive and tensile strain in Ag thin films on Si(111)-(7×7) surfaces

B N Dev

Growth and strain behavior of thin Ag films on Si substrates have been investigated by scanning tunneling microscopy, cross-sectional transmission electron microscopy and high resolution x-ray diffraction studies. Ag islands formed on Si at room temperature growth show strongly preferred heights and flat top. At low coverage, [~ 1 monolayer (ML)] Ag islands with (111) orientation containing two atomic layers of Ag are overwhelmingly formed. Thicker (40 ML) annealed films show two closely- spaced Ag(111) diffraction peaks - one weak and broad and the other narrow and more intense. The broad peak corresponds to an average expansion (0.21%) and the narrow intense peak corresponds to a contraction (0.17%) of the Ag(111) planar spacing compared to the bulk value. This can be explained in terms of changes in the Ag lattice during the heating-cooling cycle due to thermal expansion coefficient mismatch between Ag and Si.

3.2.1 Growth of fullerene on Ag and hydrogen-passivated Si substrates: Effect of electron beam exposure on growth modes

B N Dev

We have used Auger electron spectroscopy (AES) to investigate the effect of electron beam exposure on growth modes of fullerene (C60) on substrates like Ag and hydrogen-passivated Si(1 1 1). The electron beam comprises of 3.4 keV electrons, which are used in the AES study. To investigate the effect, Auger signal (AS) vs. deposition time (t) measurements were conducted in a sequential mode, i.e., alternating deposition of C60 and analysis using the electron beam. Duration of AES data collection after each deposition was the duration of exposure to electron beam in this experiment. For the growth study of

C60 on Ag, three AS–t plots were recorded for three different durations of exposure to electron beam. Changes in the AS–t plot, depending on the duration of exposure to the electron beam, reflect the electron beam-induced damage. Electron beam induced damages of C60 produce carbon materials of different densities and consequently transmission coefficienta ( ) of Auger electron through this material changes. In order to fit the AES (AS vs. t) data a model has been used which simultaneously provides the growth mode and the transmission coefficient. Observation of an increasing transmission coefficient with the increasing duration of exposure to the electron beam from a = 0.34 to 0.60 indicates the change of the nature of the carbon material due to the partial damage of C60 by the electron beam that is used in AES.

3.3 Microstructural evolution, atomic migration, and FePt nanoparticle formation in ion-irradiated Pt(Fe)/C(Fe) multilayers

B N Dev

Ion-irradiation-induced microstructural modifications, atomic migration, and nanoparticle formation 48  IACS ANNUAL REPORT 2007-08 in nanoscale periodic Pt/C multilayer systems containing about 15 at. % Fe have been analyzed by x-ray reflectivity, x-ray standing wave (XSW), transmission electron microscopy, and grazing incidence x-ray diffraction (GIXRD) studies. The multilayer stack with 15 Pt(Fe)/C(Fe) layer pairs (period 4.2 nm) was irradiated with a 2 MeV Au2+ ion beam, which was rastered on the sample to obtain uniformly irradiated strips with fluences ö from 1x1014 to 1x1015 ions/cm2. Up to a certain threshold ion fluence

(öt) we have observed mixing between Pt and C atoms. At higher fluences (ö > öt) demixing effect is pronounced. This phenomenon has been explained in terms of two competitive processes including ballistic and chemically guided atomic movements. As revealed by XSW measurements, ion irradiation causes preferential migration of Fe toward Pt layers from C layers. Consequently Fe concentration in the Pt layers increases with a corresponding decrease in the C layers. The decrease in Fe concentration in the C layers has an exponential dependence on the ion fluence. From the gradual change in shape of the Fe fluorescence yield curve, over the first order Bragg peak region, due to ion irradiation we can infer that Fe atoms migrate from C to Pt layers in the outward direction. This outward migration of Fe has been explained in terms of surface segregation of Fe in Pt under the irradiation condition. Cross- sectional transmission electron microscopy has revealed the gradual change in the microstructure, considerable atomic redistribution, and cluster formation for irradiation at the highest ion fluence (1x1015 ions/cm2), where FePt nanoparticle formation is observed in GIXRD experiments. FePt is a ferromagnetic material. The results and analysis presented in this work provide an understanding of the evolution of ion-beam-induced ferromagnetism and the increasing coercive field with ion fluence in the Pt(Fe)/C(Fe) multilayer system.

3.3 The effects of MeV Ag ion irradiation on multiwalled carbon nanotubes

B N Dev

Multiwalled carbon nanotubes were irradiated using 2 MeV Ag2+ ions with fluences 1x1015 and 1x1016 ions/cm2. The samples were characterized by transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The graphene structure of the nanotube wall is found to be damaged upon irradiation. Although at a fluence of 1x1015 ions/cm2 the outer morphology of the nanotubes remains unchanged, samples irradiated with a fluence of 1x1016 ions/cm2 show complete destruction of the graphene structure. The amorphous structure produced due to irradiation is found to show an increased number of sp3 hybridized carbon atoms.

3.3.1 Surface roughness of ion-bombarded Si(100) surfaces: Roughening and smoothing with the same roughness exponent

B N Dev

We have carried out scanning tunneling microscopy experiments under ultrahigh vacuum condition to study the roughness of pristine as well as ion-bombarded Si(100) surfaces and of ultrathin Ge films deposited on them. One half of a Si(100) sample (with native oxide layer) was irradiated at room temperature using 45 keV Si- ions at a fluence of 4x1015 ions/cm2 while the other half was masked. STM measurements were then carried out on the unirradiated as well as the irradiated half of the sample. Root-mean-square (rms) roughness of both the halves of the sample has been measured as a function of STM scan size. Below a length scale of ~ 30 nm we observe surface smoothing and surface roughening is observed for length scales above this value. However, the surface is self-affine up to length scales of ~ 200 nm and the observed roughness exponent of 0.46 ± 0.04 is comparable to earlier cases of ion sputtering studies where only roughening [J. Krim, I. Heyvart, D.V. Haesendonck, Y. Bruynseraede, IACS ANNUAL REPORT 2007-08  49

Phys. Rev. Lett. 70 (1993) 57] or only smoothing [D.K. Goswami, B.N.Dev, Phys. Rev. B 68 (2003) 033401] was observed. Ge deposition on clean ion-irradiated as well as pristine Si(100) surfaces increases the surface roughness with an increase of the values of the roughness exponents.

4.1 Single Crystal Growth and Characterization of Nonlinear Optical Materials.

T Kar

Some new complexses of L-valine have been synthesized and molecular formula were established by CHN, NMR, X-ray single crystal structure analysis. Bulk single crystals of these materials were then grown in a microprocessor controlled crystallization bath. Optical, thermal, mechanical and structural characterization of these amino acid based salts have been completed. Second harmonic efficiency of these materials are found to be comparable to urea.

4.2 Crystal Structure Analysis by Single Crystal XRD

T Kar

/ / One mononuclear Cu(II) compound [Cu(OAc)(2,2 -dypam)2](ClO4), (1), where HOAc and 2,2 -dypam are, respectively, acetic acid and 2,2/-dipyridylamine, has been synthesized and characterized by single crystal XRD. Compound 1 crystallized in monoclinic system, Space group P21 /c, a = 13.928(4)Á , b = 7.965(3)Á, c = 22.232(7) Á, a = 900, b = 92.75(2)0 , g = 900, Z =4, R1 for 2130 observed reflection [1>2s(1)] measured at 150(2) K was 0.0716. The cations of 1 link each other by N-H×××O hydrogen bonds to form infinite 1D zig-zag chains, which are further stabilized by weak intra-chain C-H…p and p…p interactions. Two such adjacent chains along c axis are joined by C. H…O hydrogen bond to form a 2D network. These 2D layers are further bridged by perchlorate anions via weak anion –ð interactions that act as a supramolecular glue to build the 3D supramolecular network.

5.1 Electronic and magnetic Materials

5.2.1 Polymer Electrolytes

S K De

Nanoparticle inorganic filler ceria, CeO2 is incorporated into polyethylene oxide (PEO)-NH4ClO4 salt complex. Ceria nanoparticles improve the thermal stability of PEO salt composites. Two crystalline phases are found in thermal studies. Interfacial interaction of ceria with PEO is confirmed by the systematic variation of Fourier transform infrared spectra. The addition of ceria enhances the conductivity of PEO complex by one order of magnitude.

5.2.2 Magnetic Nanostructures

S K De

NiO nanorods of diameter 50-100 nm and length 400-500 nm doped with Fe have been synthesized in the presence of ethylenediamine by hydrothermal method. Nanorods are highly oriented along (111) direction having hexagonal facet ends. Doping of Fe into NiO introduces an optical absorption band at 220 nm. Pure NiO nanorods exhibit weak ferromagnetic and antiferromagnetic like behaviors. The introduction of Fe within NiO lattice produces significant ferromagnetic property with coercive field of 614 Oe . 50  IACS ANNUAL REPORT 2007-08

5.2.3 Ferromagnetic shape memory Alloys

S K De

Ferromagnetic shape memory alloy Ni2Mn1.4Sn0.6 reveals large magnetoresistance around martensitic transition. Comprehensive investigations of magnetoresistance and magnetization as a function of temperature and magnetic field establish that the alloy remembers the arrested state at the highest magnetic field.

6. Optical Nanomaterials

A Patra

The aim of our work is to preparation and investigation of optical properties of a variety of nanoparticles. Out interest is to develop highly efficient upconverted oxide nanoparticles by modification of radiative and nanoradiative relaxation processes by changing the structure, size and shape of such nanocrystals. The local environment of dopant and host of doped and coated nanomaterials and their role on photoluminescence properties of nanophosphors were studied.

The understanding of the energy transfer between nanoparticle and dye is studied. Recently, we reported that surface energy transfer from dye to the Au nanoparticle which follows 1/R4 distance dependence. This new observation is very much beneficial for FRET studies in biological system.

6.1 Tunning of Crystal Phase and Luminescence Properties of Doped Nanocrystals (NSTI Project)

A Patra

The optical properties of doped nanocrystals continue to be a research attention in terms of both their fundamental and technological importance. Precise control of the size and shape allows manipulation of the properties of the nanocrystals as desired. In addition, phase control is crucially important, as the properties of the materials are determined first by their phase. From the fundamental point of view, the physical understanding of the luminescence properties of rare-earth ions in nanocrystals and the way it changes with crystal phase and local structure is very important. It is well established that in the luminescence of rare-earth ions the highest phonon frequencies of the host lattice are responsible for non-radiative relaxations. To overcome the phonon decay problem it is necessary to choose a lattice that has lower phonon energy. As we move towards nanotechnology, it is worthwhile to investigate the efficiency of rare-earth ions in nanocrystals because nanoscopic interactions play key roles in controlling the excitation dynamics. Of particular interest of our research program is how the physical properties of rare-earth ions vary with modification of crystal phase which is again tuned by changing composition and host with the hope that such knowledge will enable us to construct efficient nanomaterials.

6.2 Energy Transfer between Nanoparticle and Dye Molecules (NSTI Project)

A Patra

In recent years, the understanding of the Förster resonance energy transfer (FRET) between two different dyes, QD and dye-labeled biomolecule, and QD and polymers is one of the most important topics. It is now well established that QDs have several advantages over dyes in FRET studies in biological system. Dyes are commonly used in biological system for Förster resonance energy transfer (FRET) study, FRET studies commonly used for biological research to measure molecular distances or donor-to-acceptor proximity. However, FRET technique is restricted on the upper limit of separation of only 80 A. In recent years, surface energy transfer (SET) between dye molecule and metal nanoparticles has gained interest IACS ANNUAL REPORT 2007-08  51 because this technique is capable of measuring distances nearly twice as far as FRET which will help to understand the large scale conformational dynamics of complex biomolecules in macroscopic detail. The fundamental question, how the shape of nanoparticle causes any noticeable change on energy transfer process that we are trying to understand.

7.1 Novel porous materials and nanocomposites

A Bhaumik

Mesoporous materials with different framework compositions have been synthesized by self-assembly of ionic and non-ionic surfactants as templates under sol-gel and hydrothermal conditions. These mesoporous materials are also used as hard template after the removal of the surfactants through calcination or acid-extraction to synthesize novel nanostructure materials. Potential applications of the porous materials are explored.

7.2 Advanced microporous and mesoporous materials

A Bhaumik

Functionalized advanced microporous and mesoporous materials have been synthesized and their adsorption, ion exchange, catalytic, optical, electrical or magnetic properties have been explored. These novel materials these materials were characterized using XRD, N2 sorption, SEM/TEM-EDX, FTIR, UV-Vis., PL spectroscopy, Mössbauer, TG-DTA, solid state MAS NMR, etc. Eco-friendly liquid and gas phase oxidation reactions over some of these microporous and mesoporous materials containing transition elements have been carried out under eco-friendly conditions for the synthesis of organic fine chemicals.

8.1 Photoassociation of ultracold atoms

B Deb

The effects of strong laser light on photoassociation spectrum of ultracold atoms is investigated in detail. Application of an intense Gaussian laser beam for photoassociating two ultracold atoms into an excited molecule leads to anisotropic dipole force coupling free-bound transitions. This dipole force causes excitations of higher rotational levels which are otherwise inaccessible due to ultracold temperature.

8.2 Exploration of superfluidity/superconductivity in ID Fermi gas

B Deb

Two mechanisms of long- and short-range interactions in different geometries of ultracold atomic Fermi gases is explored. We show that in the range of validity of the one-dimensional (ID) approximation, both mechanisms yield similar superfluidity or superconductivity. The effects of electromagnetically induced long-range dipole-dipole interactions on the bulk properties of ID Fermi gas is investigated.

9.1 Electrical properties of low dimensional organic semiconductors

S K Saha

Conjugated polymer nanotubes, nanorods have been synthesized in the chemical route and electrical charge transport like metallic conduction, M-I transition giant dielectric permittivity have been investigated. It is observed that polymer nanotubes with wall thickness ~ 20 nm shows metallic 52  IACS ANNUAL REPORT 2007-08 conduction with a positive temperature coefficient of resistance. Controlled nanostructures viz. Y-shaped and V-shaped are synthesized using ultrasonic energy.

9.2 Electro-deposited metal (viz. Ag, Ni) nanowires

S K Saha

Electro-deposited metal (viz. Ag, Ni) nanowires have been synthesized to investigate giant dielectric permittivity due to quantum confinement of electronic wave functions. Voltage pulse has been used to form an assembly of ultra fine metal particles and under the application of electric field particles are connected to each other to form metal filament which shows giant dielectric permittivity as a result of quantum confinement of electronic wave function.

9.3 Synthesis of materials for fabrication of organic solar cell and light emitting diodes

S K Saha

MEH-PPV nanowires have been synthesized using anodic alumina as template and UV-VIS, PL properties and lifetime measurements have been carried out. It is seen that exciton lifetime increases in these nanowire systems than the film of comparable thickness. Nanocomposites of metallic silver particles and MEH-PPV have been synthesized to use as active materials for organic solar cell application.

10.1 Mechanism of tunneling magnetoresistance in double perovskites

S Ray

Double perovskite systems have become highly interesting due to the observation of high temperature and low-field tunneling magnetoresistance in them. We are currently very actively involved in understanding the microscopic nature of this phenomenon, the nature of barrier etc. and also whether such phenomenon is generally present in all other double perovskites of the same family. Accordingly, we have synthesized several members of the double perovskite group and carried out detailed magnetic and magnetotransport measurements on them. Our results brings out an universal mechanism for tunneling magnetoresistance in these systems.

10.2 Study of Dilute Magnetism in oxide insulators

S Ray

We are also actively involved in studying unusual magnetism that is found to develop in highly insulating oxide matrices by dilute doping of localized spins. We have recently reported the observation of room temperature ferromagnetism in high quality, single crystalline dilute Fe-doped BaTiO3, where the large equilibrium solubility of Fe ions in the matrix refutes uncertainties about secondary phase magnetism, which has often eclipsed this interesting field of research. While room temperature ferromagnetism is observed at and above 5% Fe concentrations, one finds a highly concave temperature dependence of the susceptibility. Using detailed ab initio calculation, this has been related to intrinsic magnetic inhomogeneities arising from positional disorder. Apart from providing a mechanism for the observed high temperature ferromagnetism, our results point out that intrinsic disorder is a generic and essential component of dilute magnetism.

11.1 Colloidal synthesis of nanomaterials IACS ANNUAL REPORT 2007-08  53

N Pradhan

Synthesis of different size and shape controlled semiconductor, metal oxides, metal and alloyed nanostructures in colloidal route are carried out using high temperature inert atmosphere technique. Oriented attachments of dots to rods/wires and semicircular nanowires are carried out by varying the ligand chemistry. Cubic cadmium sulfides semi-circular nanowires are synthesized at mild condition, which are straightened using long chain fatty amines. Similarly amine capped straight ZnS nanowires were made circular by exchanging acid ligands. Not only the oriented attachments but also variety of highly emitting doped nanocrystals were synthesized in colloidal route. Mn doped ZnS and ZnSe were carried out in a ripen process which leads to more than 40% QY. These are normally synthesized using a fixed size host and dopants but at different annealing time. Normally annealing removes the dopants but here we observed annealing helped the dopants to go inside at a fixed temperature with increasing the QY. 54  IACS ANNUAL REPORT 2007-08

DEPARTMENT OF SOLID STATE PHYSICS

Bijay Krishna Chaudhuri, Senior Professor

High TC superconductors (oxide and heavy Fermion systems); CMR properties; magnetoferroelectric and giant dielectric materials; electrical and dielectric properties of oxide glasses; bioactive glasses; nanocrystals and composite systems; properties of ferroelectric and antiferroelectric liquid crystals and their phase transitions

Associates: (1) S Taran, SRF (CSIR); (2) M Rahman, SRF (CSIR); (3) S Karmakar, SRF (CSIR); (4) E Bose, SRF (CSIR); (5) S Sarkar, SRF; (6) S S Bhattacharyya, SRF; (7) A Mukherjee, JRF (CSIR); (8) P K Jana (Part-time)

Monika Mukherjee, Senior Professor & Head Crystal structural analysis; Twinning; Structural disorder; Phase transition; X-ray Powder Crystallography; Macromolecular crystallography; Molecular dynamics simulations of proteins and nucleic acids

Associates: (1) B Chattopadhyay, JRF; (2) D K Hazra, JRF; (3) P Dasgupta, RA

A Ghosh, Professor Disordered and nano-structured materials: Ion dynamics; conductivity spectra and scaling; mixed mobile ion effect; short-range and microscopic structure

Associates: (1) D Dutta, RA; (2) S Bhattacharya, SRF, (3) S Kabi, JRF (RCI); (4) A Karmakar, JRF (CSIR); (5) B Deb, JRF (CSIR)

Amlan Jyoti Pal, Professor Electronic devices based on organic semiconductors and nanomaterials; Rectification in a nanowire; Memory and switching devices for data storage applications; Photovoltaic devices and photodetectors; Molecular electronic devices; Device physics

Associates: (1) S Sahu, SRF (CSIR); (2) K Mahanta, SRF (CSIR); (3) A K Rath, SRF (CSIR); (4) B C Das, SRF (CSIR); (5) B Ghosh, JRF

Saurav Giri, Associate Professor Magnetic and transport properties of mixed-valent compounds with perovskite structure; Synthesis and characterization of the magnetic nanoparticles; Studies on exchange bias phenomenon; Magnetism of chalcogenides

Associates: (1) K De, SRF; (2) M Thakur, SRF; (3) M Patra, JRF (CSIR); (4) A Karmakar, JRF; (5) S Das, JRF (CSIR)

Durga Basak, Associate Professor IACS ANNUAL REPORT 2007-08  55

Growth of semiconductor thin films and nanostructures; photoluminescence and photoconductance spectroscopy; fabrication of ZnO based p-n heterojunctions and their characterizations

Associates: (1) R Ghosh, SRF (CSIR); (2) S Mridha, SRF; (3) M Dutta, JRF; (4) A. Bera, JRF (CSIR); (5) T Ghosh, JRF (DST)

Subham Majumdar, Associate Professor Transport and magnetic studies of ferromagnetic shape memory alloys

Associates: (1) S Chatterjee, JRF; (2) A Bhattacharyya, JRF

I Dasgupta, Associate Professor Electronic structure calculations of novel magnetic systems (Diluted magnetic semiconductors); strongly correlated systems; low dimensional quantum spin systems; magnetic properties of materials at nano-scale and superconductivity in disordered alloys

Associates: (1) V Singh, JRF (DST)

1.1 Study of new generation high dielectric materials

B K Chaudhuri

Characterization and preparation of high dielectric ceramic oxides and multifunctional materials. Mainly XRD, SEM, TEM and XPS study are used to analysis microstructure of the ceramics. Temperature (150 – 400 K), frequency (100 Hz – 1MHz) and voltage dependent (up to ± 35 V) capacitance and conductance are measured to elucidate the behavior of the charge carriers. Recently, our group is trying to overcome the limitation of such internal barrier layer capacitance (IBLC) materials for wide commercial purpose for use in charge and memory storing devices.

1.2 Study of structural, transport and magnetic properties of hole and electron doped manganites

B K Chaudhuri

Mixed valent manganites were prepared by ceramic as well as sol-gel methods. SEM, TEM, XRD etc techniques are used to characterize the samples. Transport properties (resistivity, magnetoresistance and electroresistance) were measured by four probe method. Thermopower and thermal conductivity are measured employing a differential thermocouple method. Magnetic data (dc and ac susceptibilities) are acquired using SQUID. Major research interests include nature of orbital and charge ordered insulators, phase coexistence, spin and cluster glass states, metamagnetic transitions etc. Considering the application aspects, resistivity switching, colossal electroresistance and magnetocaloric effects are also studied in these systems.

1.3 Phase transition and switching in Ferroelectric and Antiferroelectric liquid crystals

B K Chaudhuri

The fundamental aspects of switching (electrical and electro-optical) in Ferroelectric and Antiferroelectric liquid crystals (FLC and AFLC) and device implementation of these materials were studied. The main objectives were to analyze following issues:(a)Phase transitions in liquid crystals (LC), (b) Characterization 56  IACS ANNUAL REPORT 2007-08 of LC by polarization microscopy and dielectric spectroscopy. (c) Investigation of switching dynamics of various FLC and AFLC molecules in frequency dependent Capacitance- Voltage (C-V) and Polarization- Electric field (P-E) hysteresis method. (d) Investigation of the electro-optic response of FLC and AFLC molecules under arbitrary wave functions. Some of the issues have been successfully executed.

1.4 Study of magneto ferroelectric properties of some magnetic perovskite

B K Chaudhuri

Magnetic and electronic materials permeate every aspect of modern technology. The vast amount of data is often stored as regions of opposite magnetic polarization in ferromagnets (materials with a spontaneous magnetic polarization that can be reversed by a magnetic field).

The sensors industry relies heavily on a related class of materials known as ferroelectrics (materials with a spontaneous electric polarization that can be switched by an applied electric field). Many ferroelectrics are also ferroelastic—that is, a change in their electric polarization isaccompanied by a change in shape. As a result, they are used to convert sound waves intoelectrical signals in sonar detectors, and to convert electrical impulses into motion in actuators.Such materials, which combine two or more “ferroic” properties known as multiferroics. CdCr2 S4, CdCr2 Se4 etc. are found to be special type multiferroic materials with strong magnetotriction.

These materials are magnetic semiconductor as well as multiferroic. Moreover, recently we observed electric field induced metal insulator transition in such a system. The origin of such multifunctional behavior of a system is not known. We have started work in this field and some magnetic and agneto- dielectric properties have been studied.

2.1 Molecular Dynamics simulations of proteins and nucleic acids

M Mukherjee

Molecular dynamics simulations have been performed on a A-DNA structure using the force-field parameters (ff99) as implemented in AMBER8 software package. The large repulsive charges of the two chains of A-DNA in-vacuo resulted in uncoiling the strands. Calculations in explicit solvent environment with 8Å buffer of TIP3P water in each direction and constant pressure periodic boundary water box MD simulations using particle mesh Ewald method preserve the molecular conformation in A-DNA. The results provide structural and dynamical information useful to complement crystallographic studies of DNA structures.

2.2 Crystal Structure Analysis, Twinning, Structural disorder, Phase transitions, X-ray Powder diffraction

M Mukherjee

Crystal structures of merohedrally twinned pentaisothiocyanateoxorhenium and hexaisothiocyanatorhenium complexes have been determined from single crystal X-ray diffraction data. The coordination geometry around the metal centers of the anions in both complexes is distorted octahedral. Crystal structure and molecular conformation of a Uranium complex, a bicyclo[2.2.1] heptan derivative and a benzoyloxy hydrazone have been established. The molecular packing in these compounds are stabilized by intermolecular C—H…O hydrogen bonds. Supramolecular architecture in 2 the bicycloheptane can be described in terms of R2 (8) rings. Structural study of a symmetrical dipeptidyl urea using synchrotron radiation reveals four molecules in the asymmetric unit. IACS ANNUAL REPORT 2007-08  57

Ab-initio structure determination of one organic ligand and another metal complex, both exhibiting in vivo anticancer activity, has been accomplished from laboratory X-ray powder diffraction data. The crystal structures have been solved using direct-space approach (simulated annealing method) and refined by the Rietveld method.

3.1 Structure, relaxation dynamics and scaling of glasses and nanocomposites

A Ghosh

We have synthesized several glass and polymer nanocomposites containing a-AgI nanocrystals, ZnO nanoparticles and Ag2S nanoparticles. We have studied relaxation dynamics of charge carriers and scaling of the conductivity spectra for these materials. The effect of the size and growth of different nanophases on the relaxation dynamics was also studied. We have also synthesized silver nanowires of high aspect ratio in superionic tellurite glasses, showing metallic behavior. The metallic conduction in silver nanowires embedded in these glasses was analyzed using Bloch-Gruneisen relation. Correlation of ion dynamics and structure in superionic silver tellurite glasses was also investigated. Structure, optical properties and transport mechanism of several semiconducting glasses were investigated. The origin of mixed mobile ion effect in tellurite glasses was shown to arise from the reduction of dimension of the conduction space.

4.1 Memory applications of single nanoparticles

A J Pal

CdSe nanoparticles with sizes down to the quantum dot regime display electrical bistability. The degree of electrical bistability depended on the size of the particles. A two-dimensional array of such particles showed conductance switching with an associated memory phenomenon. The switching was reversible for many cycles with two sets of current-voltage characteristics. The results hence demonstrate that CdSe nanoparticles or quantum dots can be used as memory elements with a density of a bit per particle.

4.2 Application of carbon nanotubes in organic memory

A J Pal

Fluorescein sodium, which does not exhibit electrical bistability in thin films, can be switched to a high conducting state by the introduction of carbon nanotubes as channels for carrier transport. Thin films based on fluorescein sodium/carbon nanotubes display memory switching phenomenon among a low conducting state and several high conducting states. Read-only and random-access memory applications between the states resulted in multilevel memory in these systems. Results in thin films and in a monolayer show that instead of different molecular conformers, multilevel conducting states arise from different density of high conducting fluorescein molecules.

4.3 Rectifying junction between two ZnO nanoparticles

A J Pal

We form pn-junctions by electrostatic binding of a p-type and an n-type ZnO nanoparticle. Current- voltage characteristics of pn-junctions are rectifying in nature. Individual components of the junction do not show any rectification. An np-junction, formed by reversing the binding sequence of the two 58  IACS ANNUAL REPORT 2007-08 types of nanoparticles, shows rectification in the opposite bias direction. By controlling the type of dopants in the ZnO nanoparticles, pn+ (and n+p) and nn+ (and n+n) junctions are formed that exhibit rectification. Current rectification in a junction between two nanoparticles shows that a depletion layer have formed even in the quantum dot regime.

5.1 Exchange bias effect in manganites and magnetic properties of nanoparticles of alloys

S Giri

We observe the exchange bias effect some mixed-valent compounds with perovskite structure, where the exchange bias effect is attributed to the spontaneous phase separation. The exchange bias is observed at the intrinsic ferromagnetic and spin-glass interface. The particle size dependence of exchange bias effect is observed for LaMn0.7Fe0.3O3, where the effect becomes stronger with decreasing particle size.

The nanoparticles of Co50Ni50 embedded in the amorphous SiO2 matrix are synthesized using sol-gel techniques. The sizes of the particles are varied from 7 to 20 nm, which exhibit different magnetic properties. The magnetic anisotropy is found to increase with decreasing particle size. The coercivity and reduced remanance of magnetization are found to be significantly larger for Co50Ni50 than that of the values for Fe, Co, Ni, and their alloys.

6.1 Thin films of wide band gap oxide semiconductor

D Basak

The effect sol concentration on the morphology, optical and optoelectronic properties of ZnO thin films prepared by sol-gel technique has been investigated. UV photodetection by Pt-Mg0.1Zn0.9O/ZnO type of

Structure and bias dependent UV photo detection by Au-Mg0.1Zn0.9/ZnO-Ag structure have been studied. The issues of doping in ZnO films have also been focused. Therefore, the optical and photoconductivity of even wider band gap, Mg substituted ZnO thin films have been studied. Aluminium doped ZnO films have been developed and their electrical, optical and photoresponse properties have been examined for application as transparent conducting oxide layers

6.2 ZnO-based p-n heterojunction

D Basak n-ZnO/p-Si thin films heterojunctions have been fabricated. The rectifying junction properties are explored for the UV and VIS photodetector applications. The photocapacitance measurement as well has been done to identify the presence of trap level.

6.3 Studies on GaN and ZnO nanostructures

D Basak

Growth of nano- and micro- structured GaN in bulk powder and on substrate has been carried out by direct reaction of Ga with NH3. A detailed investigation has been carried out to study the effect of growth temperature, NH3 flow rate, grinding step, different substrate and au catalyst on the morphology and other properties. IACS ANNUAL REPORT 2007-08  59

Self-seeded growth of ZnO nanowires (NWs) on glass substrates at low temperature by aqueous solution method has been investigated. The growth morphology and the photoconductivity of the NWs are studied by varying the sol concentration of the seed layer. Also a growth model is proposed.

Electrical and ultraviolet photoresponse properties of quasi-aligned ZnO NWs/p-Si heterojunction grown at low temperature have been studied. The rectification property of the NW arrays/p-Si as well as single NW junction is characterized. The UV photoresponse properties of the NWs/Si junction have been found to be promising for the development of nanostructured based UV photodetectors.

7.1 Magneto-thermal irreversibility in Ni-Mn-Sn alloys

S Majumdar

Magnetic shape memory materials are some ferromagnetic alloys in which, large shape deformation is possible by an external magnetic field. The key to their functional behavior is a structural transition called martensitic transformation. The shape memory alloys of composition Ni2Mn1+xSn1-x have been investigated by transport and magnetic measurements. Large negative magnetoresistance is observed around the martensitic transition temperature. Both magnetization and magnetoresistance data indicate that upon the application of an external magnetic field at a constant temperature, the samples attain a field-induced arrested state which persists even when the field is withdrawn. We observe an intriguing behavior of the arrested state that it can remember the last highest field it has experienced. The field- induced structural transition plays the key role for the observed anomaly and the observed irreversibility can be accounted by the Landau-type free energy model for the first order phase transition.

8.1 Electronic Structure of Diluted Magnetic Semiconductors

I Dasgupta

Our research is devoted to the search of diluted magnetic semiconductors with high Curie temperature. In this respect we have investigated oxide based diluted magnetic semiconductors and semi-conducting half-Heusler alloys as potential DMS hosts. We have carried out calculations to understand the origin of novel magnetic properties in transition metal doped ZnO both in bulk as well as in nano-crystalline form. Our calculations suggest that high Curie temperature can be attained in these systems, however native defects and vacancies are crucial to mediate exchange interactions in these systems. We have also studied in details transition metal doped semi-conducting half-Heusler systems. Our calculated results indicate that some of these compounds are half-metallic ferromagnets with high Curie temperatures and our prediction was verified experimentally.

8.2 Electronic Structure of Low Dimensional Quantum Spin Systems

I Dasgupta

We have applied the N-th order muffin-tin orbital (NMTO) based downfolding method to low dimensional oxides exhibiting novel magnetic properties. In particular we have shown that getting the chemistry into the Hubbard Hamiltonians for these strongly correlated systems with the aid of NMTO downfolding technique is crucial to understand them. We have analyzed in details the electronic structure of the quasi-one dimensional spin gap compound BaCu2V2O8, the uniform S=1/2 linear Heisenberg anti- ferromagnetic chain systems (Sr,Ba)2Cu(PO4)2 and the spin gap behavior in the two-leg spin ladder system BiCu2PO6. 60  IACS ANNUAL REPORT 2007-08

8.3 A real space approach to study superconductivity in disordered alloys

I Dasgupta

In this work we have combined Bogoliubov-de Gennes method with the Augmented Space Recursion (ASR) method in order to study s-wave and d-wave superconductivity in disordered systems. We have considered single band Hubbard model with attractive interaction and on-site disorder in two and three dimensions to simulate our system. The mean-field Bogoliubov-de Gennes equation for superconductivity is solved selfconsistently using the ASR method, for both local (s-wave) and non-local (d-wave) pairing. The method has been applied to disordered alloys with correlated and uncorrelated disorder. IACS ANNUAL REPORT 2007-08  61

DEPARTMENT OF SPECTROSCOPY

Prasanta Kumar Mukherjee, Professor

Theoretical spectroscopy of confined atomic; ionic and exotic systems; Applications of atomic spectroscopy for plasma diagnostics; Highly accurate variational calculations for doubly excited states of two electron systems and ground states of three body systems

Associates: (1) S Bhattacharya, (Part-time); (2) J Saha, (Part-time); (3) P Bhattacharya (Part-time)

Sankar Chakravorti, Professor Photophysics and Photochemistry of molecules, Excited state photodynamics

Assocites: (1) D Sahoo, JRF; (2) A Manna, JRF; (3) T Adhikary (Part-time)

Subir Kumar Roy, Professor Dielectric; electro-optic, studies of nematic; ferroelectric; antiferroelectric; antiferroelectric orthoconic liquid crystals and Polymer stabilized ferroelectric liquid crystals (PSFLC) and polymer dispersed ferroelectric liquid crystals (PDLC); Liquid crystal nano composite

Associates: (1) S Ghosh, (JRF); (2) P Nayek (Part-time)

Tapan Ganguly, Professor Development of artificial photosynthetic devices; Development of organic-Inorganic nanocomposites; Laser Dynamics; Electrochemical / steady state and Time resolved spectroscopic investigations; Photo induced processes and relaxation dynamics; Excitational energy and photo induced electron transfer processes

Associates: (1) P Mandal, SRF; (2) S Bhattacharya, SRF (DST); (3) M Bardhan, SRF (CSIR)

Biswanath Mallik, Professor Electronic absorption and emission spectroscopy; Laser spectroscopy; Semi- and photoconductivity of organics/ organometallics; Nanomaterials: characterization, optical and electrical properties

Associates: (1) S Karan, SRF; (2) M Majumder, JRF; (3) A K Chakraborty, RA-II; (4) A Thander (Hony); (5) M K Sanyal (Hony); (6) D Basak (Hony)

Gautam Buddha Talapatra, Professor Laser Spectroscopy; Raman and SER Spectroscopy; Electronic absorption and Emission; Exciton Dynamics; Exciton-Exciton Interaction; Langmuir-Blodgett and Self assembled Films

Associates: (1) T Kamilya, JRF; (2) J Sarkar, JRF; (3) P Pal, RA- III 62  IACS ANNUAL REPORT 2007-08

Krishna Rai Dastidar, Professor Lasing without Population Inversion; Non-linear Optics; Multiphoton Processes; Non-local Quantum Electrodynamics; Coherent control of molecular dynamics and quantum computation in molecules; Ultrafast phenomena; Bose-Einstein Condensate

Associates : (1) Moumita Gupta, SRF; (2) Sulagna Dutta, SRF

Abhijit Kumar Das, Associate Professor Theoretical study of stability; structural properties and dissociation of molecules

Associates: (1) N C Bera, SRF; (2) D Ghosh, JRF; (3) B Mondal, JRF (CSIR); (4) I Bhattacharyya (Part- time); (5) S Bagchi (Part-time)

1.1 Spectroscopy of atomic systems under external confinements

P K Mukherjee

Applications of time dependent perturbation theory to investigate the spectroscopic properties of atomic, ionic and exotic systems under external confinements due to weak as well as strong plasma. The effect of spatial confinements induced by imposing finite boundary conditions on thewave functions and structural properties of atomic systems. Behavioral pattern of the transition properties with respect to the coupling strength of the plasma. Diagnostic determination of weak as well as laser produced plasma.

1.2 Highly accurate variational calculations

P K Mukherjee

Extremely accurate variational calculations for thee body systems including full correlations. Report of several benchmark results. Highly accurate variational calculations for the doubly excited states of helium like systems. Interesting predictions about spectroscopic lines.

1.3 Spectral shifts of atoms under liquid helium confinements

P K Mukherjee

Theoretical investigations on the spectral line shifts of alkali atoms under liquid helium environments using ab-initio quantum chemical methodologies.

2. Photophysics and excited state properties of some organic systems with functional groups

S Chakravorti

Interesting structural influence of different non-ionic micelles on the excited state proton transfer photophysics of 2-hydroxy 1-naphthaldehyde evince that the anion formation is favored in Brij micelles compared to Tween type due to hydrogen bonding ability of Brij micelle. Preferential appearance of cis and trans anionic conformers of 2-hydroxy 1-naphthaldehyde in different types of nonionic micelles has been identified on the basis of theoretically calculated barrier height of formation and time-resolved emission data. IACS ANNUAL REPORT 2007-08  63

3.1 Dielectric relaxation dynamics of electrically tuned large-scale aligned nanorods in TNLC

S K Roy

It was observed that mixed nanorods and twisted nematic liquid crystals (TNLC) composite system show highly ordered molecular system. The observed molecular relaxation arose due to reorientation of long molecular axis of the order of 400 kHz for pure TNLC while such relaxation was shifted to a lower frequency for mixture. By using the proposed equation and , the obtained equivalent activation energy was increased remarkably by the introduction of nanorods in pure TNLC and a strong long range interaction is established in 0.01% nanorods when mixed LC system.

3.2 Bias dependent relaxation process occurred in different phases of an orthoconic antiferroelectric liquid crystal (OAFL)

S K Roy

We observe a stable multiplexed display by using triangular signal with 1Hz. With the application of bias field at three different temperatures, we obtain three distinct transition points, *such asSmIA - SmCA*, antiferroelectric to ferroelectric, and ferroelectric to paraelectric transition. We have observed Frederick’s transition from SmIA*? SmCA* phase at 4 V at 300C and such Frederick’s transition point is decreased with the increase of temperature.

4.1 Experimental Investigations by using steady state and laser flash photolysis techniques to reveal the nature of the photophysical processes involved within the several organic dyad systems and a Theoretical Approach by Using Time-Dependent Density Functional Theory

T Ganguly

From the electrochemical, steady state and time resolved spectroscopic studies it was apparent that a novel synthesized dyad, 1-(4-Chloro-phenyl)-3-(4-methoxynaphthalene-1-yl)-propenone (MNCA) seems to be an efficient candidate to build light energy conversion devices.

4.2 Development of organic-inorganic nanocomposite systems

T Ganguly

Nanoparticles TiO2 semiconductor appear not to act as an acceptor with 7-methoxy-naphtho- [1,2-b] thiophene-2- carboxylic acid (7MTCA) but its presence helps to survive or protect the charge-separated species formed within 7MTCA where both the donor –OCH3 and acceptor –COOH functionalities are attached at the two different ends of it.

Effect of TiO2 nanoparticles on the excited charge-separated species of the organic dyad MNCA has been investigated in details.

4.3 Time resolved investigations on the artificial photosynthetic devices in the pseudo-ordered domain of a nematic liquid crystal. A theoretical consideration by using TD-DFT

T Ganguly

The charge-separation and charge recombination rates within the organic dyad MNCA were found to 64  IACS ANNUAL REPORT 2007-08 remain nearly unchanged (within the experimental error) irrespective of the polarity of the environment, whether in pseudo-ordered domain (above nematic-isotropic phase transition temperature) of a nematic liquid crystal 5CB or in highly polar isotropic medium acetonitrile. From the relatively larger charge- separation rates in comparison to energy wasting charge recombination process, it was presumed that MNCA may form the basis for the future light energy conversion device.

4.4 Memory effect in chains of donor-acceptor complexes

T Ganguly

Attempts are being made to design organic E-type mnemonic systems in the form of extended D-A chains and to study both by steady state and time resolved spectroscopic techniques to establish the behaviors of these extended donor-acceptor chains as switching devices for information storage and molecular computing.

4.5 Triplet photoreactions

T Ganguly

Time resolved spectroscopic investigations demonstrate the formation of the ground state of the reacting components (donor and acceptor) through recombination of triplet ion-pairs via formation of contact neutral radical produced by H-abstraction mechanism.

5.1 Effects of annealing on the morphology and optical property of copper (II) phthalocyanine nanostructured thin films

B Mallik

Copper (II) phthalocyanine (CuPc) thin films deposited at room temperature on indium tin oxide (ITO) substrates have exhibited a change in their surface morphology with the post-deposition annealing temperature under normal atmosphere. These films have been characterized by optical absorption, X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM). The FESEM images have shown densely packed nanoparticle- and nanorod-like structures for the substrates annealed at different temperatures. The fractal dimension of the assembly of nanostructures in the films has been estimated from FESEM images. The effect of annealing temperature on the surface morphology, optical properties and the fractal dimension has been discussed.

5.2 Nanoflowers Grown from Phthalocyanine Seeds: Organic Nanorectifiers

B Mallik

Nanoparticles and nanoflowers of different metal (II) phthalocyanines (MPc; copper, nickel, tin, magnesium, and zinc) as well as metal-free (H2Pc) were grown, at room temperature, by vapor deposition at high vacuum (~10-6 Torr). The role of the effect of substrate condition in molecular organization of phthalocyanine on gold coated quartz substrates was studied. The particle size and morphology (studied by FESEM) of the nanostructures were found to be mainly determined/controlled by the nature of the template (substrate) used. UV-vis absorption spectra of the ordered films were recorded, showing unique dependences on the molecular alignments. The fractal dimension of the assembly of nanostructures, estimated from FESEM images was observed to depend on the nature of substrate as well as the phthalocyanine used. Based on the observations, we believe that the nanoflowers observed in our investigation were grown through VS (Vapour-Solid) mechanism. Rectifying behavior (organic IACS ANNUAL REPORT 2007-08  65 diode like) of phthalocyanine nanorod/gold heterojunction was noticed.

5.3 Studies on the Photoluminescence in Semiconductor Nanocrystallites

B Mallik

(i) Tunable Visible-Light Emission from CdS Nanocrystallites Prepared under Microwave Irradiation

The microwave (MW)-assisted reaction of cadmium acetate with thiourea in N,N-dimethylformamide (DMF), by manipulating the duration/ time of MW irradiation in the presence of 1-thioglycerol as a capping agent enabled growth of CdS nanocrystallites in DMF. Photoluminescence of the CdS nanocrystallites, dispersed in chloroform, observed in the visible range shifts toward higher wavelength with increased duration of MW irradiation. When the MW irradiation was repeated for a fixed duration in colloidal solution of CdS nanocrystallites in DMF, enhancement in PL intensity was noticed without any change in the emission peak position. The relative PL quantum yield of the CdS nanocrystallites was estimated under various experimental conditions. The visible emission from the nanocrystallites was tunable over a large wavelength scale. Such tunable emission was attributed to the quantum confined effect in the nano-scale CdS crystals. Time-correlated single photon counting experiments were performed to study the time-resolved photoluminescence of CdS nanocrystallites. Such experiments indicated that the time correlated fluorescence was originated from a convolution of emitting states from different sized nanocrystallites.

(ii) Photoluminescence in Porous Silicon

The photoluminescence (PL) properties at room temperature in porous Si (PS) samples (having nano scale pores, identified by SEM) was studied. A resonant feature at ~467 nm, originating from a strong coupling of localized excitons at the Si/SiO2 interfacial states and Si-O vibrational modes, was examined during photoluminescence measurements for an excitation wavelength of 320 nm. Furthermore, appearance of luminescence bands in the range of 378-412 nm could be due to a quantum confinement assisted radiative recombination of electrons and holes at impurity related defects or at the vacancies of neutral oxygen.

5.4 Investigations on the metallocene-based polymer nanocomposites by using photoconduction and conventional spectroscopy

B Mallik

Preparation of polymer films and polymer films dispersed with some organometallic compounds along with the measurement of their photo and dark conductivity behaviour under various conditions has been performed. The polymer films were characterized by using UV-Vis absorption and FTIR spectroscopy, XRD and FESEM. Significant changes in the electrical behaviour in the films with dispersed organometallic compounds has been noticed. Research in this area is on progress.

5.5 Preparation, characterization and studies on the optical and electrical properties of nanocomposites having metal nanoparticles

B Mallik

Attempts were made for preparing silver nanoparticles by a novel and simple method for the preparation of polymer nanocomposites having metal nanoparticles. Some progress has been made in this area 66  IACS ANNUAL REPORT 2007-08 of research.

6.1 Interaction and Incorporation of Ovalbumin with Stearic Acid monolayer: Langmuir-Blodgett film formation and deposition

G B Talapatra

The surface activity of the ovalbumin (OVA) at the air/water interface was studied to establish the nature of the interaction with the stearic acid (SA) monolayer, based on Langmuir–Blodgett (LB) technique. The interaction was monitored by studying the time (t) variation of surface pressure (?) at constant area (A). The growth of ? with time indicates a positive association between the SA and the OVA molecules. The surface compressibility analysis has been performed to specify the phase transition of OVA–SA mixed monolayer. Incorporation/association of OVA within the SA monolayer led to noteworthy changes in surface compressibility and was surface pressure as well as protein concentration dependent. Both the hydrophobic and the Vander wall type interactions are found to be responsible for the association. The quenching of tyrosine band in tryptophan excitation spectrum is observed in steady-state fluorescence spectroscopy. This suggests that the tyrosine is the probable binding site with SA. Due to incorporation of SA, the energy transfer from tyrosine to tryptophan is hindered. At higher pressure, OVA tend to squeeze out from the SA monolayer. The high-resolution field emission scanning electron microscope (FE-SEM) image confirms this observation. Aggregated protein structure observed at high pressure indicates unfolding of protein.

6.2 Incorporation of Ovalbumin within cationic Octadecylamine monolayer and a comparative study with zwitterionic DPPC and anionic Stearic acid monolayer

G B Talapatra

We demonstrated the incorporation of water-soluble surface-active protein OVA within an insoluble cationic ODA monolayer and compared with zwitterionic (DPPC) and anionic (SA) monolayer. The incorporation of OVA is found to be more in ODA as compared to that of DPPC and SA. The kinetics of protein adsorption in lipid monolayer gives the idea that unfolding of OVA is less in case of DPPC than SA and ODA. The ?–A isotherm and compressibility study gives the information about the different states of the protein–lipid mixed monolayer. At higher pressure, OVA tend to squeeze out from the lipids monolayer. High-resolution field emission scanning electron microscope (FE-SEM) images confirm this observation. The surface morphology of DPPC–OVA LB film is far better than ODA–OVA and SA–OVA LB film. OVA forms large irregular aggregates on SA and ODA monolayer. Fluorescence study reveals that protein structure is perturbed more in SA and ODA system compared to that of DPPC. The overall results indicate that DPPC monolayer is better to get protein lipid mixed film than SA and ODA monolayer.

6.3 Adsorption of 4-Methyl-4H-1, 2, 4-Triazole-3-Thiol molecules on silver nano colloids: FT-IR, Raman and Surface-enhanced Raman Scattering study aided by Density functional theory

G B Talapatra

Surface enhanced Raman scattering (SERS) in silver nanocolloids and normal Raman spectra (NRS) in the bulk and in aqueous solution of 4-Methyl-4H-1, 2, 4-Triazole-3-Thiol (4-MTTL) molecule have been investigated. The observed Raman bands along with the corresponding FTIR bands have been assigned from the potential energy distributions (PED) in terms of internal coordinates of the molecule estimated from the output of the DFT calculations. The pH dependent NRS spectra of the molecule in aqueous solution have been recorded to elucidate the protonation effect and preferential existence IACS ANNUAL REPORT 2007-08  67 of the tautomeric form/ forms of the molecule in acid, neutral and alkaline media. The SERS spectra of the molecule adsorbed on nanocolloidal silver surface at various pH values are also reported. The appearance of overlapped Ag-N, Ag-S stretching vibrations, considerable red shift of 1488 cm-1 band and enhancement of all the bands principally representing the in-plane vibrations of the A/ species of the thione form of the molecule in the SERS spectra, suggest that the molecules are adsorbed onto the nano colloidal silver surface through the lone pair electrons of N1 and S6 atoms with the molecular plane tilted with respect to the silver surface at acidic, neutral and alkaline pH.

6.4 Concentration dependent orientational changes of 2-Amino-2-thiazoline molecule adsorbed on silver nano colloidal surface investigated by SERS and DFT

G B Talaoatra

The concentration-dependent surface-enhanced Raman scattering (SERS) study of the biologically important, 2-amino-2-thiazoline (2ATH) molecule adsorbed on silver nanocolloids has been investigated. The SERS spectra of the molecule at different adsorbate concentrations are compared with its FTIR spectrum and normal Raman spectra (NRS) in varied environments. The optimized structural parameters and computed vibrational wavenumbers of the tautomeric amino and the isomeric imino forms of the molecule in the gas phase and in methanol solvent have been estimated from density functional (DFT) calculations. The observed Raman signals along with the corresponding FTIR bands have been assigned for the first time from the potential energy distributions (PED) in terms of internal coordinates of the molecule estimated from the output of the DFT calculations. Vibrational analyses reveal that imino species are prevalent in the solid state while the amino species of the molecule are prevalent in methanol solution. The adsorbate concentration-dependent SERS spectra of the molecule adsorbed on a nanocolloidal silver surface are also reported. Considering the entire concentration-dependent SERS spectral profile and the surface selection rule, it has been predicted that at higher adsorbate concentrations the amino and the Z-isomeric imino form of the molecule attain face-on adsorption geometry. Alternatively, at dilute concentrations, the amino form of the molecule has edge-on adsorption geometry with the molecular plane lying nearly orthogonal to the nanocolloidal silver surface.

7.1 Control of Non-linear processes in molecules

K Rai Dastidar

The feasibility of lossless and dispersionless transmission of laser light with spectral width as large as 10 THz in LiH molecule has been explored by designing a broadened Electromagnetically Induced Transparency (EIT) window. EIT can be achieved by controlling the interference of dynamically induced coherence (DIC) and spontaneously generated coherence (SGC) in a three level Lambda system in presence of incoherent pumping. SGC can be invoked by dressing two closely spaced levels (e.g. hyperfine levels in atoms or rovibrational levels in molecules) by an external field. It has been shown the broadening of EIT window can be controlled by changing the strength of bidirectional incoherent pumping which is a new approach for achieving wide EIT window. The most attractive feature is that FWHM of EIT window is further increased in presence of homogeneous/ inhomogeneous decay. Experimental realization of this method is possible. Exact analytical solutions for populations and coherences have been used to obtain susceptibility and group velocity in the steady state limit.

7.2 Coherent control of molecular dynamics

K Rai Dastidar 68  IACS ANNUAL REPORT 2007-08

By controlling the interference of vibrational wave packets one can enhance one product state over the other. This interference of wavepackets ++++++phase difference and the delay between two pulses which generate two wavepackets on the excited state. The shape and the duration of the pulses play a significant role to achieve this control. By controlling the abovementioned factors one can actually design the wavepacket to oscillate in phase or out of phase with selected vibrational levels on the excited state leading to control over the overlap with these vibrational levels and hence the population. Thus from the quantum interferogram for the population code of different vibrational levels covered by the broad bandwidth of ultrashort pulses one can get the information about the phase and the amplitude of the wavepacket. It can be shown implementation of quantum gate operation in molecules is possible.

7.3 Ground state and dynamical properties of atomic Bose-Einstein Condensate

K Rai Dastidar

The modified Thomas-Fermi equation (MTF) can be solved analytically by using higher order iteration method (MTF(p)) for a cylindrically trapped atomic Bose-Einstein condensate (BEC) and it can successfully reproduce the ground state properties obtained by solving the modified Gross-Pitaevskii equation numerically (imaginary time method). Extention of this analytical method to obtain dynamical properties of cylindrically trapped atomic BEC has been done. We have proposed a model function which when fitted with the analytical wave function (from MTF equation) near the boundary of the trap can reproduce the correct behaviour of the ground state density of atoms at the surface region. Different energy components and the excitation frequency for the compressional mode obtained by using the modified analytical method (MTF(p)+model function fitting) can successfully reproduce the results obtained by solving MGP equation numerically for 85Rb BEC containing 104 atoms both for spherical and cylindrical traps.

7.4 Multiphoton Ionization in atoms

K Rai Dastidar

A relativistic analysis of the spin-symmetric and spin-flip ionization currents for Dirac hydrogen atom interacting with local and non-local mode of electromagnetic field has been done by using field theory and intense field S-matrix method. It has been shown before that correlated two-photon excitation in a system can occur through interaction with non-local electromagnetic field and the non-local electromagnetic field is gauge invariant. Two photon ionization rates of H-atom in presence of intense circularly polarized light for interaction with local and nonlocal mode of electromagnetic field have been calculated. The angular dependence of spin-current for interaction with both the modes of electromagnetic field has been compared. Signature of spin current asymmetry has been found.It has been shown that the rate due to nonlocal mode of interaction plays a dominant role towards the lower intensity and it saturates before that due to local interaction dominates and controls the rate at a particular photoelectron energy.

8.1 Spectroscopy of weakly bound molecule

A K Das

The spectroscopic properties and nature of interaction between the two interacting atoms of various IACS ANNUAL REPORT 2007-08  69 weakly bound diatomic molecules in Lennard-Jones potential have been studied in detail using our newly developed method. Most of the results are first reported.

8.2 Structural properties and dissociation pathways of molecules

A K Das

The structural properties, dissociation pathways and isomerization of BrCN and ICN have been studied in detail using ab initio and density functional methods. Various dissociation processes of these molecules have been investigated considering that the fragmented atoms are either in their ground state or in their metastable states. New dissociation channels have been predicted.

8.3 Spectroscopy and dissociation of diatomic dications

A K Das

The spectroscopy and dissociation of diatomic dications have been studied. Both charge symmetric and charge asymmetric dissociation of diatomic dications have been investigated. Various dissociation processes of homo and hetero-nuclear diatomic dications have been explored.

8.4 Stability, thermodynamic properties and dissociation of molecules of astrophysical interests

A K Das

Stability, thermodynamic properties and dissociation of Methylsilanitrile (CH3SiN) and Silysilanitrile

(SiH3SiN) and their isomers have been studied using ab initio and density functional methods. G3 and G3¦B3LYP enthalpies of formation at 0K and 298.15K are calculated using atomization scheme. The bond dissociation energy and energy barrier for all possible dissociation pathways are studied at 0K and the most probable dissociation products are predicted.

8.5 Spectroscopic properties of molecules containing light atoms

A K Das 70  IACS ANNUAL REPORT 2007-08

DEPARTMENT OF THEORETICAL PHYSICS

Jayanta Kumar Bhattacharjee, Senior Professor & Head (on lien w.e.f. 01.01.2008)

Non linear dynamics and Statistical Physics

Associates: (1) S Biswas, SRF; (2) T Naskar, JRF (CSIR) ( Joined on 01.08.07); (3) H S Samanta, SRF, (on leave for one year w.e.f 02.07.07); (4) S Chatterjee, SRF; (5) D Chakraborty, SRF (CSIR); (6) N Bera, SRF (CSIR); (7) A Bhattacharya (Hony); (8) S Bhattacharyya (Hony) (9) S Chakraborty, RA-I (on leave for six months w.e.f. 01.02.08)

Jayprakash Chakrabarti, Senior Professor

Bosonisation on the lattice in one and higher dimensions; Fermions on the lattice in presence of background magnetic field; DNA sequences; and computational Genomics

Associates : (1) S Das, SRF; (2) Z Ghosh, SRF; (3) B Mallick, SRF; (4) A Pan (DBT-PD Fellow, GOI); (5) A Basu (Hony); (6) R Mukherjee (Hony); (7) M Mukherjee (Hony) (8) S Bhattacharya (Hony)

Chandana Sinha, Professor

Atomic collisions with electrons; positrons and ions and also in presence of laser field Quantum chaos

Associates: (1) S Ghosh Deb, SRF; (2) S Roy (Hony)

Soumitra Sengupta, Professor

Supergravity; String Theory; Gravity; Cosmology; Braneworld

Associates: (1) D P Maity, SRF (CSIR) (on leave for six month w.e.f. 30.10.07); (2) J Mitra, JRF (CSIR); (3) R Koley, RA-II (joined on 01.02.2008)

Utpal Chattopadhyay, Associate Professor

Elementary Particle Theory: Physics beyond the standard model; particularly involving physics of low energy supersymmetry; Phenomenological implications of various supersymmetry breaking mechanisms; Constraining supersymmetric models via supersymmetric dark matter analyses

Associates: (1) D Das, SRF (CSIR); (2) P Ghosh, JRF (CSIR)

Sudhansu Sekhar Mandal, Associate Professor

Condensed Matter Physics

Associates: (1) A Sensharma, SRF, (resigned on 12.11.07); (2) S P Mukharjee, SRF (CSIR); (3) D Majumdar, JRF (CSIR) IACS ANNUAL REPORT 2007-08  71

Koushik Ray, Assistant Professor D-Branes and String Theory

Associates: S Paulchoudhury, SRF

Sourov Roy, Associate Professor Physics beyond the Standard Model; in particular, phenomenology of supersymmetric theories Other areas of interest: axion phenomenology in background electromagnetic field; Neutrino masses and mixings in extra-dimensional scenario

Pushan Majumdar, Assistant Professor (Joined on 01.10. 07) Lattice Gauge Theory

1. HIGH ENERGY PHSYSICS

1.1 Fields, String, Cosmology, etc

S Sengupta and K Ray

A) Warped braneworld models

Goldberger-Wise stabilization of the Randall-Sundrum braneworld has been critically analysed to show that there exists a maxima along with the minima for the modulus potential. Randall-Sundrum (RS) braneworld model has been generalized to arbitrary number of warped dimensions. The model provides a possible resolution to the fermion mass hierarchy problem in the standard model.

In a separate work, it is shown that all the higher form bulk antisymmetric tensor fields are suppressed on the visible TeV brane in a RS framework. Thus warped geometry explain the absence of such fields on our brane.

B) Supersymmetry and Supergravity

Occurrence of a light fermion and its role in a generalized supergravity theory has been discussed in a split supersymmetry scenario. A possible reconciliation of dark matter with lepton number violating neutrino masses is found in the backdrop of a supergravity theory.

C) Black Hole

Study of black holes in non-flat space time is a subject of great interest for a long time. Various aspects of a slowly rotating dilaton black hole have been studied in an anti-desitter spacetime.

Various topological properties of D-branes in the type—IIA theory are captured by the topologically twisted B-model, treating D-branes as objects in the bounded derived category of coherent sheaves on the compact part of the target space. The set of basic D-branes wrapped on the homology cycles of the compact space are taken to reside in the heart of t-structures of the derived category of coherent sheaves on the space at any point in the Kähler moduli space. The stability data entails specifying a t-structure along with a grade for sorting the branes. Considering an example of a degenerate Calabi-Yau space, obtained via geometric engineering, that retains but a projective curve as the sole non-compact part, we identify the regions in the Kähler moduli space of the curve that pertain to the different t-structures of the bounded derived category of coherent sheaves on the curve corresponding to the 72  IACS ANNUAL REPORT 2007-08 different phases of the topological branes.

Problems of stabilizing moduli of the type--IIB string theory on toroidal orientifolds of a six-torus, in presence of worldvolume fluxes on various D-branes, have been considered. For Z2 actions, introducing either O9 or O3 planes, we rule out the possibility of moduli stabilization in a wide class of models with N=1 supersymmetry, characterized by the type of fluxes turned on along D-brane worldvolume. Our results, in particular, imply that Abelian worldvolume fluxes can not by themselves stabilize closed string moduli, in a consistent supersymmtric model, for above orientifold compactifications. We also discuss other Z2 orientifolds of a six-torus and show that certain other brane wrappings are also ruled out by similar consistency requirements. In specific setups we consider examples with D9-branes wrapping on a complex three-torus with its world-volume fluxes taken to be semi homogeneous bundles and D7- branes wrapping holomorphic four-cycles of the complex three-torus carrying world-volume fluxes.

1.2 Particle Physics Phenomenology

U Chattopadhyay and S Roy

A) Non-zero trilinear parameter in the mSUGRA model - dark matter and collider signals at Tevatron and LHC

New regions of the parameter space in the minimal super-gravity (mSUGRA) model with small universal scalar and small universal gaugino mass parameters consistent with the Wilkinson Microwave Anisotropy Probe (WMAP) data on dark matter relic density open up if the rather ad hoc assumption of vanishing common trilinear soft breaking parameter, employed in most of the existing analyses is relaxed. This region corresponds to relatively light squarks and light gluinos which are likely to be probed extensively in the very early stages of the LHC runs. In this context the consequences of moderate or large negative values of the common trilinear soft breaking parameter are examined in detail. We find that in this region several processes including lightest supersymmetric particle (LSP) pair annihilation, LSP - lighter tau slepton co-annihilation and LSP - lighter top squark co-annihilation contribute to the observed dark matter relic density. The possibility that a relic density producing lighter top squark can be observed at the current experiments at the Tevatron is quite open. On the other hand, at the LHC a large number ??? of squark - gluino events lead to a very distinctive semi-inclusive signature ? ?X?? (anything without a tau lepton) with a characteristic size much larger than the corresponding electron and muon events.

B) Extending the Higgs funnel region of SUSY dark matter relic density via non-universal scalar masses

A non-universal scalar mass model (NUSM) with inverted mass hierarchy for scalars is being probed where the radiative electroweak symmetry breaking condition (REWSB) is made less constraining so as to have super-heavy scalar masses for the first two generations. Thus, this addresses the flavour changing neutral current (FCNC) problem. The scenario on the other hand preserves naturalness. The lightest stable particle (LSP) is dominantly a Bino that pair annihilates via Higgs exchange giving rise to a WMAP satisfied relic density (through funnel region or A-pole annihilation mechanism) both for small as well as large values of tan?, the ratio of Higgs vacuum expectation value. Obtaining A-pole annihilation is usually not possible unless tan??is large in universal models like mSUGRA. The small m1/2 region, the so called bulk annihilation region of mSUGRA, which would be discard ed via the LEP2 Higgs limit is revived here in the form of a funnel region. Detection prospects of the LSP, candidate for Supersymmetric dark matter in the upcoming dark matter experiments have also been analysed. The direct detection of neutralinos through nuclear recoil (via CDMS2 and XENON10 data) only constrains IACS ANNUAL REPORT 2007-08  73 the smaller mass regions of the lightest neutralino (below 150 GeV or so) . On the other hand, indirect detection of LSPs via continuous gamma-rays as originated in the galactic centre is found to be very promising for different galactic halo profiles in the context of the upcoming space basedGLAST experiment. The characteristic signatures of this model lie in the Higgs sector where all Higgs boson states may be well within the reach of LHC. The scenario produces a reasonably lighter third generation of squarks for a broad region of parameter space. We have also identified a large mass RGE effect which was not discussed anywhere before in the literature. We have calculated semi-analytic results for a few specific low energy parameters due to such large mass effects. This gives a more accurate set of semi-analytic solutions of a few low energy parameters for generic SUSY models with high scale physics input for small tan??

C) Constraining the Randall-Sundrum modulus in the light of recent PVLAS data

The implications of axion-photon coupling in a string inspired Randall- Sundrum model are discussed in the light of laboratory experiments like PVLAS. The measurement of birefringence and dichroism of electromagnetic waves travelling in constant and homogeneous magnetic field is strongly constrained by the recent PVLAS data. The presence of axion-photon coupling can contribute to these phenomena. Such a coupling can be found in a low energy string action from the requirement of quantum consistency. The resulting coupling is determined by the moduli parameters which encode the compact manifold. The possible bounds on the value of compact modulus are examined that emerge from the experimental limits on the coupling obtained from the PVLAS data. Focussing into Randall- Sundrum (RS) type of warped geometry model, it is shown that the PVLAS results on birefringence and dichroism put severe restrictions on the axion mass and modulus if RS model has to resolve the hierarchy problem of the standard model. The proposed value of the modulus in RS scenario can only be accommodated for axion mass  0.3 eV.

D) Signals of sneutrino-antisneutrino mixing at the LHC

In the framework of supersymmetric models, sneutrino and antisneutrino mixing is a generic feature where neutrinos have non-zero Majorana masses. This leads to sneutrino-antisneutrino oscillation phenomenon and can be interpreted as the observation of a sneutrino decaying into a final state with a “wrong-sign” charged lepton. Such a signal can be enhanced naturally in anomaly-mediated supersymmetry breaking scenario. If these signals are observed then it is also possible to extract information on certain combinations of the neutrino masses and mixing angles. We have been analyzing the prospects of observing sneutrino-antisneutrino oscillation in the context of LHC.

E) Neutrino masses and mixing in a supersymmetric model with gauge singlet neutrinos solving the µ problem

We examine in detail the neutrino masses and mixing patterns in an extension of the minimal supersymmetric standard model with three gauge-singlet neutrinos and R-parity violation. The Majorana masses for the gauge-singlet neutrinos as well as the usual µ-term for the Higgs superfields are generated at the electroweak scale through the vacuum expectation values of the singlet sneutrinos. The resulting effective mass matrix for the three light neutrinos have contributions from the seesaw mechanism involving the singlet neutrinos as well as due to the mixing with the heavy neutralinos. We show that even with a flavor diagonal neutrino Yukawa coupling the global data on three-flavour neutrinos can be well accounted for in this scenario. We also analyze the mixing in the chargino and the Higgs sector and calculate the decays of the lightest supersymmetric particle in this model. Some 74  IACS ANNUAL REPORT 2007-08 other phenomenological implications of such a model have been discussed.

1.3 Lattice Gauge Theory

P Majumdar

Developing programs for simulations of dynamical overlap fermions. Studying the chiral phase transition of compact U(1) lattice gauge theory in the deconfined phase. Exploring the higher energy states of the flux tube / hadronic string formed between a quark anti-quark pair in pure Yang-Mills theory.

2. ATOMIC AND MOLECULAR PHYSICS

2.1. Positron and positronium physics

C Sinha

A) Antihydrogen Interaction

We have studied the formation of antihydrogen in the ground and excited states (2s, 2p) via the mechanism of three body recombination (TBR) inside a trapped plasma of antiprotons and positrons. The calculation of the cross-section for the above three body recombination is of interest since the antihydrogen is a preferred system for high precision studies of the charge conjugation symmetries of physics. Significantly large cross-sections are found at low incident energies in the TBR process as compared to the other processes leading to antihydrogen . The present formation cross-sections are found to decrease with increasing positron energy (or temperature) but no simple power law could be predicted for it covering the entire energy range, corroborating the experimental findings qualitatively. Detailed studies are done both for the differential (DCS) and total formation cross sections (TCS).

2.2. Ion-atom collision , Atom-atom collision

C Sinha

Fragmentation of orthopositronium (1s) in collision with Li ion is studied in the framework of the Coulomb distorted eikonal approximation (CDEA), giving special emphasis on the dynamics of the electron loss to the continuum (ELC). Both the fully differential (TDCS) and the double differential (DDCS) cross sections are investigated at intermediate and high incident energies. Two different wave functions of Li ion are chosen in order to test the sensitivity of the present results with respect to the choice of the wave function.

Cold hydrogen-hydrogen scattering has been investigated using non adiabatic close coupling approximation model. Singlet and triplet partial wave elastic and total cross sections are presented and are compared with existing theoretical predictions using Born-Oppenheimer model.

A calculation has been carried out for the resonance energies and widths for some S-wave auto ionization states below and up to the H (n=4s) threshold of the positron-hydrogen system as a function of Debye lengths using complex coordinate rotation model. All the results reported here are determined by using basis functions up to N=1140 terms, and they are well converged.

The results are presented for ground state anti-hydrogen scattering off meta-stable He targets at thermal IACS ANNUAL REPORT 2007-08  75 energies using atomic orbital expansion technique. This calculation suggests that meta-stable singlet target is a good buffer gas to cool anti-hydrogen.

Plasma embedded electron-positronium scattering has been investigated employing close coupling approximation model. The 2s21Se auto-detaching resonant state of positronium negative ion has been successfully predicted for various plasma environments.

2.3. Laser assisted collisions

C Sinha

The dynamics of the electron impact multiphoton ionization of a hydrogen atom in the presence of an intense laser field has been studied theoretically, with a view to compare the results with some recent experiments of the He target. We have noted the modifications in the present doubly (DDCS) and the fully differential cross-sections (TDCS) due to the application of the laser field. For most of the explored kinematics (chosen in accordance with the experiment), the present binary peak intensity of the laser assisted TDCS is significantly enhanced with respect to the field free ones which is in agreement with the experiment but in contradiction with the existing first order theories. Importance of the multiphoton effects are also studied.

3. CONDENSED MATTER PHYSICS, STATISTICAL PHYSICS & NON-LINEAR PHYSICS

3.1 Physics of Correlated Electrons

J Chakrabarti

(i) We continued, indeed intensified, our work in physics, as we consolidated in biology. Here our primary focus is the problem of electron in a magnetic field on the two dimensional lattice. The problem is well known, and has been formulated in Harper’s equations. However, the Harper’s equations are generally not analytically soluble. Analytical solutions exist in a few simple cases.

(ii) Collaborative work with S Bhattacharyya continued on Laser-induced atomic/molecular processes.

3.2 Strongly Correlated Electrons

S S Mandal

A) Superconductivity

Structure of a single vortex in s-wave superconductors is well understood. However the same for a d-wave superconductor is still unclear. We have made an attempt to obtain this by self consistently solving Bogoliubov-de Gennes equations with strong correlation effect taking into account. Our result is consistent with the experimental findings.

Another class of superconductors with lack of centre of symmetry is also studied in my group. These superconductors have a mixture of spin-singlet and spin-triplet pairing at very low temperatures. By studying Ginzburg-Landau theory, we predict a crossover temperature at which pairing transforms 76  IACS ANNUAL REPORT 2007-08 into spin-triplet or spin-singlet only. This temperature is slightly below the superconducting transition temperature. It possibly explains the kink structure obtained in superfluid density data.

B) Spin – Hall Effect

Spin accummulation is observed at the transverse edges in a two dimensional electron system when an electric field is applied. This is known as spin-Hall effect. However spin-Hall conductivity at the bulk of the system is zero for a disordered two dimensional electron gas with Rashba spin-orbit interaction for an uniform electric field. We have investigated the situation if electric filed is nonuniform along the transverse direction. We find that spin-Hall conductivity resonates for a disordered system when spin precission length matches with the wavelength for variation of the electric field.

C) Fractional Quantum Hall Effect

The single mode approximation in 1/3 fractional quantum Hall state predicts a neutral (particle-hole) collective excitation mode. The composite fermion theory also describes a collective mode when one of the composite fermions is excited to the next composite fermion Landau level from the lowest one. These explain the data obtained in resonant Raman scattering. However technological advancement makes it possible to determine excitations at lower momenta recently. The evidence of two modes with very small seperation is reported. This anomaly is rectified by our group by considering composite fermion excitations into higher composite fermion Landau levels and hence the paradigm of single mode approximation in fractional quantum Hall effect is argued to be invalid.

3.3 Statistical Physics and Hydrodynamics

J K Bhattacharjee

A) Statistical Physics

We looked at the question of persistence in finite geometry for an order parameter field when it is quenched from a high temperature to the critical temperature. The global persistence exponent was calculated and shown to depend on the size of the confining region. A result that has attracted a lot of attention in the last decade is the Jarzynski equality which relates the average of the exponential of the work done in time T in a system acted upon by a time dependent force (hence out of equilibrium) to an equilibrium quantity which is the free energy difference between the states at t=0 and t = T. An interesting issue relates to the probability distribution of work done and we showed that even if the evolution dynamics is symmetric, the probability distribution of the work done is asymmetric.

B) Nonlinear dynamics

The principle result was the calculation of the third order structure factor for a rotating turbulent fluid. The third order structure factor has always been a cornerstone for any kind of turbulence and this work has supplied this missing piece for the rotating fluid. It clarifies immediately the issue of dimensional reduction under rotation.

In the study of accretion dynamics in a two dimensional geometry a perturbation theory exploiting the smallness of viscosity was set up to handle a situation where viscosity although small is essential since IACS ANNUAL REPORT 2007-08  77 in the absence of viscosity, the spiraling accretion flow cannot be sustained. The issue of travelling and standing waves in a circular hydraulic jump was explored to bring out the close connection between the radius of the jump and the radius of a white hole.

4. Biological Physics/Computational Biology

J Chakrabarti

(i) A year of consolidation for us. As the RNA revolution the world over gathered pace, we fine-tuned our strategies: focusing and reorienting ourselves towards the emerging area of small RNAs. We developed a software in-house, using the data stored at the Sanger Institute site, towards annotating micro RNAs. In the meantime couple of our ideas dealing with microRNAs appeared in BBRC. Our work on microRNAs was presented at the Indo-French workshop at CCMB, Hyderabad and at the International Conference at Miami, Florida, organized, amongst others, by the Nature Publishing Group. Invitations were received by my students to the laboratory of Prof George Cross at Rockefeller University. They made presentation there.

(ii) We continued into transfer RNAs. Here the work went in two directions. On the one hand we developed a powerful software to identify some of the unconventional tRNAs (pyrrolysine, selenocysteine and the like); on the other we began collaborating with the group of Prof. Uttam RajBhandary of MIT towards experimental verification of our prediction of overlapping tRNAs. Initial results of this collaboration were presented at the International Conference AARS – 06 in December, organised by Scripps Research Institute at San Diego. Part of our results from this collaboration appeared in RNA journal in its Jan, 2008 issue. Our article featured on its cover. Simultaneously our work on non-canonical tRNAs was presented at international tRNA conference at Uppsala, Sweden.

(iii) Collaborative work with A Pan, the DBT Post Doctoral Fellow, continued on mRNAs and their compositions.

5. INTER DISCIPLINARY PHYSICS

J K Bhattacharjee and C Sinha

5.1 Quantum Mechanics

J K Bhattacharjee

The primary result was the demonstration that for a non degenerate bound state, the second order energy shift for any excited state is negative provided at least the unperturbed and perturbing Hamiltonians are both monotonically increasing functions.

5.2 Polaron

C Sinha

There has been an increasingly renewed interest in phenomena associated with strong electron-phonon coupling due to their effectiveness in explaining transport in disordered organic semiconductors – a material which is expected to dominate the future of bio-electronics. The polaron effects can strongly influence the transport and optical properties of heterostructures as well as of polar crystals of reduced 78  IACS ANNUAL REPORT 2007-08 dimensionality (e.g. quantum well, quantum dot). Of more interest, experimentally, is the mobility of the polaron and, more generally, its response to weak, spatially uniform, time varying electric fields. We have proposed and outlined an approach to study the scattering of a bound polaron in presence of a coulomb impurity centre as well as external single mode, linearly polarized weak laser field. The differencial (DCS) as well as the momentum transfer cross-section (MTCS), which is directly related to the conductivity, has been calculated for different set of parameters. The basic underlying assumptions of the present model are (i) the frequency of the laser field is assumed to be much larger than the optical phonon frequency , (ii) the electrical component of the laser field intensity ( ) is much below the dielectric break down limit, (iii) the interaction of the electron with the phonon field is much stronger than that of the photon field ( ) (iv) the electron- phonon coupling parameter is IACS ANNUAL REPORT 2007-08  79

ENERGY RESEARCH UNIT

Swati Ray, Senior Professor Nanocrystalline Si films and their applications to Solar Cells; Solid Phase Crystallisation, Transparent Conducting Oxide

Associates: (1) S Mukhopadhyay, RA-II; (2) A Chowdhury, SRF; (3) K Adhikari (nee Bera), SRF; (4) R Goswami, SRF (MNRE)

Parsathi Chatterjee, Senior Professor & Head Computer Modelling of Amorphous; Microcrystalline/ Nanocrystalline Silicon based single junction and tandem Solar Cells and Detectors; Computer Modelling of crystalline silicon and “HIT” Solar Cells

Associates: (1) M Nath, SRF; (2) A Dutta, JRF, (CSIR); (3) S Chakraborty, JRF

Partha Choudhury, Professor Polymorphous Silicon using Argon Dilution of Silane: Application in Solar Cells; Plasma Diagnostic Study; Amorphous silicon – carbon and silicon - germanium alloy

Associates: (1) A Bhaduri, SRF; (2) A Bandyopadhyay, JRF

Debajyoti Das, Professor Nano-crystalline Silicon and Silicon Quantum-Dots for Multifunctional Applications

Associates: (1) D Raha, SRF (CSIR); (2) A Samanta, SRF; (3) A Bhattacharya, JRF (DST)

1.1 Nanocrystalline Si films and their applications to Solar Cells

S Ray

Nanocrystalline silicon films were deposited varying power and hydrogen dilution. Compressive and tensile stresses in the films were measured using a special attachment to High resolution X-ray Diffractometer. Effect of electrode separation in PECVD system on microstructure of silicon films has been studied. Amorphous Si/ nano-Si double junction solar cells were fabricated. Current-voltage characteristics and quantum efficiencies of the cells were measured. Degradation studies have been made on microcrystalline cells having different crystalline fractions. Using protocrystalline Si films stable single junction cells with more than 7% efficiency have been developed.

1.2 Solid Phase Crystallisation

S Ray

Ellipsometric studies have been done on the polymorphous Si films before and after solid phase crystallization. Crystalline growth process has been predicted from the studies. 80  IACS ANNUAL REPORT 2007-08

1.3 Transparent Conducting Oxide films

S Ray

Aluminum doped ZNO films have been developed as antireflection coating using reactive sputtering technique. Transmission, reflectance and surface texture of the films depend on the gas composition during sputtering.

2.1 Computer Modelling of a-Si:H based Solar Cells and Detector Structures

P Chatterjee

Our indigenously developed one-dimensional electrical-optical model ASDMP (Amorphous Semiconductor Device Modelling Programme) has been applied to simulate the experimentally obtained dark J-V, light J-V and spectral response characteristics of micro-crystalline silicon (?c-Si:H) PIN solar cells of different degrees of crystallinity. Since these cells have high absorption over the longer wavelengths of the visible spectrum with low light-induced degradation, they are suitable for the bottom cell of a tandem structure. Tandem solar cells with amorphous silicon as the active layer in the top sub-cell, and ?c-Si:H in the bottom sub-cell have been simulated under electrically coupled (2 terminal configuration) and electrically decoupled (4 terminal configuration) conditions. In both cases optical coupling was maintained the same. The bottom cell thickness was varied, keeping the top cell thickness constant at 0.25 mm. Up to a thickness of 2.7 mm for the bottom cell, no significant gain in cell efficiency could be achieved for the 4-terminal configuration, relative to the 2-terminal case.

2.2 Computer Modelling of crystalline silicon and Heterojunction with Intrinsic Thin Layers “HIT” Solar Cells

P Chatterjee

The novel “Heterojunction with Intinsic Thin layers” or “HIT” solar cells, of the variety N-a-Si:H / P-c-Si, fabricated in Sanyo, Japan, have been modeled using ASDMP. It was found that the performance of these “HIT” cells, specially the high fill factor of this structure, cannot be modeled in the conventional way. It appears that direct hole tunneling must be present to explain why the holes do not face any collection problems, in spite of the existence of a large valence band discontinuity, detrimental for hole collection. Accordingly, effort is being made to introduce direct tunneling into model ASDMP.

3.1 Amorphous silicon germanium and silicon carbon alloy thin films

P Chaudhuri

Alloying silicon with materials like carbon and germanium can result in materials for application in various optoelectronic devices. Silicon carbon alloy material developed in our lab has been found to possess very high ultra violet sensitivity. A project funded by IFCPAR for the development of the amorphous silicon germanium based materials for application in solar cell has been carried out successfully during 2004 - 2007. Using a modified plasma CVD technique films of silicon-germanium alloy with band gap of 1.4 eV was deposited with diffusion length (LD) of 100 nm. IACS ANNUAL REPORT 2007-08  81

3.2 Industry – Institution Project on large area solar panels using polymorphous silicon material developed at IACS

P Chaudhuri

Studies of the properties of the Polymorphous silicon material developed in an earlier project of Indo French Centre for the Promotion of Advanced Research (IFCPAR) in IACS and collaborators’ laboratories in France have shown a good possibility of this process for large area solar panel production. Use of a benign gas like argon during the preparation of the material makes the process less hazardous than the conventional deposition process of amorphous silicon. An industry-Institution research project involving our laboratory and two other French laboratories together with a French industry has started from September 2006 with funding by IFCPAR.

3.3. Development of a measurement facility for reference solar cells

P Chaudhuri

Solar cell manufacturing in India has highly accelerated in recent years. A National facility for testing and accreditation of the solar cells and modules is the need of the hour. A project has been started from 2007 to develop a calibration facility for reference solar cells and modules. IACS has been given the responsibility to develop a laboratory for calibration and testing of the reference solar cells. Solar Energy Centre under MNRE, Central Electronics Ltd. and National Physical Laboratory are also involved in this project with specific tasks. The project is funded by MNRE.

4.1 Silicon Quantum Dots for Quantum Effect Devices

D Das

Silicon quantum dots (Si-QDs) are being prepared in nano-crystalline Si structures in controlled size and distribution, using RF glow discharge CVD. By precise seeding of the nuclei on various substrates, by proper control of the grain size and grain boundary states, by further miniaturization of the micro crystals, the nano-silicon structures are being developed. In addition to the use of hydrogen, which is the conventional diluent to silane in PECVD, argon and helium are also being tried to enhance nano- crystallization and to overcome the barriers of associated low growth rate of the material, in view of its application in the development of quantum-effect devices.

4.2 Nano-Crystalline Silicon in silicon-oxide matrix for multifunctional applications

D Das

Silicon-oxide, in general, posses an interesting two-phase structure. Utilizing the silicon-rich phase of the material, nano-crystallization to the Si-network is being obtained while oxygen-rich barrier layer is to control the growth of crystallites within nano-dimensions. Using carbon dioxide as one of the component gases hydrogenated silicon oxide films are being developed in view of using those as seeds for growing improved nanocrystalline silicon materials for its use as a component layer in the fabrication of multi-junction devices for multifunctional applications. 82  IACS ANNUAL REPORT 2007-08

MLS Professor’s Unit

Dipankar Chakravorty, Emeritus Professor and INSA Honorary Scientist Associates: (1) S Bhattacharya, SRF (CSIR); (2) S Datta, (Hony); (3) P Hazra, (Hony); (4) R Maiti, (Hony)

Several nanocomposites have been synthesized and their properties delineated. Ag2S nanoparticles in a silica matrix exhibited a resistivity hysteresis signifying melting of the cation sublattice. Multifunctionality was developed in a silicate glass containing nanophases nickel and barium titanate respectively – These showed optical nonlinearity, high dielectric constant and ferromagnetic behaviour. Zinc sulfide nanocrystals doped with iron were synthesized. They exhibited ferropmagnetic behaviour arising out of a one-dimensional magnetic system. DEPARTMENT OF BIOLOGICAL CHEMISTRY IACS ANNUAL REPORT 2007-08  83

Manju Ray, Senior Professor and Head Cancer Biology and Bioenergetics

Associates: (1) D Talukdar, RA; (3) R Chatterjee, Women Scientist; (3) S Patra, SRF; (4) N Bhattcharyya (Hon); (5) S Bera, SRF (CSIR); (6) A Roy, SRF (CSIR); (7) A Pal, JRF; (8) A Ghosh, JRF (DST); (9) A Ray, Project Assistant; (10) M Sarkar, Project Assistant

Arun Kumar Guha, Senior Professor Microbial Biochemistry and Environmental Biotechnology

Associates: (1) S K Das, RA-I; (2) S Chatterjee, RA-II; (3) G C Panda (Hony)

Prasanta Kumar Das, Associate Professor Chemical-Biology and biomedicinal chemistry in self-organized assemblies and non-aqueous systems.

Associates: (1) S Roy, SRF (CSIR); (2) R N Mitra, SRF; (3) S Debnath, SRF (CSIR); (4) D Das, JRF (CSIR); (5) A Shome, JRF (CSIR); (6) S Dutta, JRF (CSIR)

Rupa Mukhopadhyay, Assistant Professor Nanobiology and Nanobiotechnology

Associates: (1) T Banerjee, JRF (CSIR); (2) S Ghosh, JRF (CSIR); (3) R Maitra, JRF (CSIR); (4) A K Das (Int. Ph.d. )

Sidharhta Sankar Jana, Assistant Professor Cell biology

1.1 Biosynthesis of creatine in tumor cells

M Ray

The protein and mRNA expression of the two ezymes of creatine biosynthesis, arginine:glycine amidino transferase (AGAT) and guanidinoacetate methyltransferase (GAMT) in tumor cells have been studied extensively. Significant expression of both these enzymes has been detected in all the three tumor cells. These creatine synthesis enzymes could possibly be considered as targets for cancer therapy.

1.2 Immunomodulatory Activity of Methylglyoxal

M Ray

Methylglyoxal is a potent antitumor agent. It had been found that methylglyoxal has also an immunomodulatory activity. It had been observed that methylglyoxal increases the number of peritoneal macrophages and also elevated the phagocytic capacity of macrophages in both the normal and tumor bearing mice. 84  IACS ANNUAL REPORT 2007-08

1.3 Identification of a novel Glyceraldehyde 3 phosphate (GAP) binding protein

M Ray

A 90,000 molecular weight protein has been identified from mice muscle. The protein has been partially characterized to ascertain its biochemical and molecular properties in biological system.

2.1 Studies on utilization of whey

A K Guha

A yeast strain has been isolated from soil which can grow in whey. The organism is identified to belong to belongs to the genus Klebsiella. The production of â- galactosidase by the organism is under investigation.

2.2 Studies on Biosorption of environmental toxicants

A K Guha

The interaction of chromium and a chromate resistant Aspergillus versicolor strain has been studied by atomic force- and transmission electron microscopies. The nanomechanical properties such as cell wall rigidity and elasticity were measured by force spectroscopy and found to be 0.61 ± 0.08 N/m, and 20.5 ± 2.1 MPa, respectively. On chromium binding, ultrastuctural changes of the cell wall along with the formation of layered structures on the cell wall were observed. TEM and AFM micrographs demonstrate the accumulation of chromium on the cell wall, which were rough and irregular compared with the smooth pristine mycelia. XPS and FTIR studies suggest that bound chromium was reduced to its trivalent state by the cell wall components. The reduced chromium species on the cell surface further electrostatically bind chromate ions forming layered structure on the cell wall.

3.1 Enzymology and Structure-Function Relationship in Bioinspired Membrane Mimetic Systems

P K Das

Microemulsions have been associated to the idea of a microreactor where enzyme can be sheltered and protected from detrimental effects of solvent. In vitro, reverse micelles are being tremendously exploited as host in diversified bioorganic transformation catalyzed by lipase, the best-known surface- active enzyme. Another enzyme, horseradish peroxidase (HRP), the most popular oxidoreductase in plant kindom is also known to remain active at the interface of the reverse micelles. The catalytic efficiencies of these enzymes were remarkably improved at the reverse micellar interface in presence of simple non-ionic surfactants. They synergistically interact with the cationic surfactants to reduce the positive charge density at the interface and thereby markedly improve the enzyme activity simply by reducing inhibition at the active site of the enzyme. We have also raised a question on the role of unsaturation present at the interface of reverse micelles in proximity of enzyme on its activity. Unsaturation introduced sequentially at the head group of surfactants constituting the reverse micelles was found to be inhibitory for the interfacially located enzymes viz lipase and HRP. The results also clarify that the inhibition by unsaturation overwhelms the activating effect of ‘space’ at the interface i.e. in presence of both the parameters, unsaturation plays the predominant role.

Also toward finding the independent/predominant role of headgroup size/hydrophilicity and interfacial composition in controlling the catalytic efficiency of lipase, the concentration of interfacial components in the cationic reverse micelles of surfactants was quantitatively determined by chemical trapping protocol. It was safely concluded that it is the headgroup size, which primarily regulates the lipase IACS ANNUAL REPORT 2007-08  85 activity in micellar enzymology.

3.2 Water gelation of amino acid and di-peptide based Surfactants

P K Das

Search for non-toxic low-molecular-weight hydrogelators with varying structural motif is getting intense globally because of its rapid response to external stimuli, thermoreversible nature and as well as potential biocompatibility. To this end, we have been successful in developing series of novel cationic amino acid as well as dipeptide based amphiphiles, by changing both the head group architecture and alkyl tail length of the amphiphiles, which are excellent gelator in plain water. The self-aggregation behavior of these thermoreversible hydrogelators were investigated through different spectroscopic and microscopic techniques such as 1H NMR, Circular Dichroism (CD), steady state fluorescence, FESEM, which showed that an optimum balance between hydrophilicity and hydrophobicity is indeed essential which can be largely regulated by varying the alkyl chain length. Thus, the study offers better understanding towards tailoring the properties of gel in plain water and thereby paving the way for potential biomedicinal applications.

4.1 Nanobiology and Nanobiotechnology

R Mukhopadhyay

A number of aspects of ‘biological interactions’, mostly with an application-oriented approach, are looked at. For example, (a) the effects of multinuclear platinum cancer drugs on DNA structure are probed, at the single molecule level, to obtain mechanistic details, for improved therapeutics; (b) diagnostic applications using biosensors that operate at the nanoscale are explored. The benefits of a piezoresistive cantilever array in providing label-free, integrated and direct readout, and suitability for lab-on-a chip application, using various polymeric and biological constructs, are tested; (c) the applicability of scanning probe microscopy based methods in providing high-resolution complementary information on protein structure and supramolecular assemblies, where NMR, x-ray crystallography, and electron microscopic methods are not adequate, is evaluated. DEPARTMENT OF INORGANIC CHEMISTRY 86  IACS ANNUAL REPORT 2007-08

Kamalaksha Nag, Senior Professor (Retd. on 31.07. 2007) and INSA Senior Scientist

Structure-property relationships in metal complexes of d- and f-block elements

Associates: (1) P Biswas, RA; (2) M Ghosh, SRF (CSIR); (3) S Dutta, SRF (CSIR)

Pradyot Banerjee, Senior Professor

Synthesis; characterization and properties of coordination complexes and nanoparticles; Bioinorganic chemistry

Associates: (1) J Chakraborty, RA; (2) K Dhara, SRF (CSIR)

Muktimoy Chaudhury, Senior Professor

Chemistry of multimetal system; Reactivity of metal-oxygen bond and Bioinorganic Chemistry

Associates: (1) D Mandal, SRF; (2) P B Chatterjee, SRF; (3) A Audhya, SRF (CSIR); (4) S Bhattacharya, SRF (CSIR); (5) Sk Md T Abtab, JRF (CSIR); (6) K Bhattacharya, JRF (CSIR); (7) M Maity, JRF (CSIR); (8) N Kundu (Hony)

Dipankar Datta, Senior Professor & Head

Concepts in Chemistry, Coordination Chemistry; Crystal Engineering

Associates: (1) S Nag, SRF (CSIR); (2) S De, SRF; (3) D Das, JRF; (4) J Kanjilal, JRF (CSIR); (5) B Maji, JRF (CSIR)

Sreebrata Goswami, Professor

Transition metal chemistry: Synthesis; Metal promoted reactions; Coordination Chemistry of ð-radical ligands

Associates: (1) S Chatterjee, SRF (CSIR); (2) S Samanta, SRF (CSIR); (3) M Sinan, JRF (CSIR); (4) N D Paul, JRF (DST); (5) S Joy, JRF (CSIR); (6) S Mandal, JRF (CSIR)

Pradyut Ghosh, Associate Professor

Development of effective molecular hosts for anion recognition and ion sensing, which include fundamental studies of the structural, thermodynamic and photophysical aspects of guest-host interactions

Associates: 1) P Lakshminarayanan, SRF (CSIR); 2) I Ravikumar, SRF; 3) M Arunachalam, SRF (CSIR); 4) B Nisar Ahamed, SRF; 5) P Bose, JRF (CSIR); 6) S Saha, JRF (CSIR)

Tapan Kanti Paine, Assistant Professor Design and synthesis of structural/functional models of metalloenzyme active sites; Trapping of IACS ANNUAL REPORT 2007-08  87 reactive intermediates and characterizations; Bio-inspired catalysis, Transition metal catalyzed/mediated organic transformations; Molecular magnetism, Inorganic materials

Associates: (1) O Das, JRF; (2) S Paria, JRF (CSIR)

Raju Mondal, Faculty Fellow Crystal Engineering; Synthesis and characterization and reactivity studies of metal-organic frameworks; Role of hydrogen bonds and weak interactions in coordination polymers

1. Structure-property relationships in metal complexes of d- and f-block elements

K Nag

A series of mixed-valence iron(II)-iron(III) complexes with phenolate and carboxylate bridges having electron releasing and withdrawing substituents have been synthesized to assess the variation of degree of electronic coupling. The stabilization energy due to electron delocalization in these complexes, as estimated from their intervalence charge transfer energies measured in solvents of differing polarities, have been compared with the corresponding comproportionation constants obtained from their redox potentials. The electronic and molecular structures of these compounds have been further studied by measuring variable-temperature magnetic susceptibilities and Mössbauer spectra and from broken symmetry DFT calculations.

Solid state and solution properties of lanthanide(III) complexes of a tetraiminediphenolate macrocyclic ligand with ancillary chloride and aqua ligands have been studied by X-ray structure determinations, proton NMR and luminescence spectroscopic methods. Although these compounds are highly stable in aprotic solvents, they spontaneously absorb carbon dioxide from air in methanol solution to form trinuclear mu3-eta2:eta2:eta2 and dinuclear mu2-eta2:eta1 types of carbonate bridge complexes. The triangular gadolinium complex (Si = 7/2) exhibits spin frustration behavior. A cage structure obtained from a dimethoxy-bridged diiron(III) complex of meta-xylyl-bis(acetylacetone) that traps dichloromethane/chloroform in the void space has been structurally studied. Thermal analysis shows remarkable stability towards solvent detrapping.

2. Synthesis, Characterization and Properties of Coordination Complexes and nanoparticles

P Banerjee

Contributions from our group are the following :

A) A new terephthalate-bridged tetranuclear copper(II) complex has been synthesized

and structurally characterized by X-ray crystallography : [Cu4(L)2(tp)(dmf)2] (1) (H3L = 1,3-bis(salicylideneamino)propane-2-ol, tp = terephthalate and dmf = N,N´-

dimethylformamide). The dinucleating pentadentate character of the ligand (H3L) and the desired pair-of-dimers arrangement, through the incorporation of the bridging terephthalate moiety, is clearly evident from the structure of 1. It binds to double-stranded 7 -1 CT (calf-thymes) DNA giving a Kapp value of 1.25 x 10 M and displays efficient cleavage

of supercoiled pUC19 DNA in the presence of H2O2 following hydroxy radical pathway. We have also measured the DNA binding and cleavage activity of an oxovanadium(V)-Schiff base complex. The structural part was done in collaboration with Professor M. Mukherjee of the Department of Solid State Physics of IACS. 88  IACS ANNUAL REPORT 2007-08

B) In our laboratory we have prepared three zinc(II) sensors of different types :

(i) an organic compound, 4-methyl-2,6-bis(((phenylmethyl)imino)methyl) phenol (HL)

(ii) a coordination compound, {[Cu2=(HL1)(N3)].ClO4a (H3L1 = 2,6-bis(hydroxy-ethyliminome thyl)-4-methylphenol) and

(iii) a material which is composed of a highly ordered 2D-hexagonal mesoporons silica (MCM-41) functionalized with 3-aminopropyltriethoxysilane (3-APTES) and grafted with a dialdehyde fluorescent chromophore, 4-methyl-2,6-diformyl phenol (DFP). By incubation of cultured living cells (B16F10 mouse malanoma and A375 human melanoma) with HL intra-cellular Zu2+ concentration could be monitored. The study on material based zinc sensor was carried out in collaboration with Dr. A. Bhaumik of Materials Science Department.

C) We have been able to synthesize a chiral Schiff-base compound, 4-methyl-2,6-bis-[(2- hydroxy-1-phenylethylimino)methyl]phenol. It acts as a fluorescent sensor in ascertaining the enantiomeric composition of ®- and (S)-mandelic acid, and may find analytical applications over a definite concentration range. This type of sensor could be useful to facilitate transport or molecular mixture separations.

D) A copper(II) complex [Cu2L(m1,1 –N3)(m1,3 –N3)( (m1,1,1 –N3)] where HL = 4-methyl-2,6-

bis(phenylmethyliminomethyl) phenol with N2O donor ligand has been synthesized. X-ray crystallographic study reveals that it is a 1D chain along crystallographic b axis - and the existence of rare m1,1,1 azide bridging mode. The compound was immobilized on mesoporous silica and the immobilized compound was used as the active catalyst for the oxidation of olefins using tert-butyl hydroperoxide as oxidant. Epoxidation reactions of unfunctionalised alkenes such as styrene, a-methylstyrene and cyclohexene with the same oxidant catalysed by four bridged polymeric nickel(II) – Schiff base complexes having terephthalate and argentocyanide as bridging moieties have also been successfully carried out. Part of this work on catalysis has been carried out in collaboration with Dr. A. Bhaumik of Materials Science Department.

3. Chemistry of Metal-Oxygen Bonds and Co-operative Effects in Di- and Polynuclear Complexes

M Chaudhury

Research from our group during the period include : (1) synthesis of tetranuclear mixed-valence manganese(II/III) complex with “dimmer of dimmers” structural form relevant to the water oxidation center (WOC) of the multisubunit bacterial enzyme photosystem II; (2) synthesis of a mononuclear octahedral manganese(III) complex involving a coordinated water molecule and a monodentate carboxylate ligand, connected together by strong hydrogen bond, making it a close structural analogue of the active sites of the oxalate metabolizing enzymes viz. oxalate oxidase and oxalate decarboxylase; (3) development of a synthetic protocol for high-yield synthesis of trinuclear complexes involving heterometal combinations, selected by choice and (4) synthesis of binuclear oxovanadium(IV) compounds following an interesting reaction pathway that involves vanadium specific nucleophilic substitution (OH- as nucleophile) in the aromatic ring of halogenated o-dioxolene moiety.

4. Concepts in Chemistry

D Datta IACS ANNUAL REPORT 2007-08  89

A previously published model of bond valence sum has been used to ascertain the nature of X-H…Y hydrogen bonds. A kind of anisotropy in such H-bonds is indicated. The van der Waals’ radii of the d-block elements have been estimated from the general concept of bond valence. These radii are found to be independent of oxidation state.

5. Coordination Chemistry

D Datta

A simple method has been devised to determine the acid dissociation constants of protic acids in non-aqueous media by exploiting solution conductance. The method has been applied to estimate the pKa values of zinc bound water molecule and coordinated ligands that bear a dissociable proton in non-aqueous milieu.

A rare kind of copper(I)-copper(II) mixed valence complex has been synthesized that displays NMR at room temperature and EPR at low temperature.

It has been demonstrated that when HNO3 is used in a controlled manner, it can be a convenient source of nitric oxide.

6. Crystal Engineering

D Datta

The importance of the matching of sizes of the counter ions in the crystallization of ionic complexes has been examined. It is found that larger the anion, less is the tendency of polymerization in the counter cation.

7. Transition Metal Chemistry: Synthesis of New Systems and Search for Applications

S Goswami

High-valent metal-oxo (M=O) complexes are well-recognized for their role in various catalytic and enzymatic oxidation processes. We have developed a one pot synthesis of a family of monooxo osmium(VI) complexes of N–aryl diamide ligand that catalyze oxidative cleavage of unsaturated hydrocarbons with remarkable efficiency. The synthetic methodology involved OsO4 promoted selective ortho-C-N fusion of aromatic amines. This result is in sharp contrast to the available literature of such oxidation reactions and has opened up further scope of studying aromatic amine fusion reactions using high valent metal oxides as templates. The new osmium complexes have been characterized structurally as well as spectroscopically. Catalytic activities of a representative complex towards oxidative cleavage of C-C bonds in a variety of alkenes and alkynes by tert-butyl hydroperoxide have been studied.

Metal complexes of the redox non-innocent 1,2-dioxolene ligand series and of their nitrogen analogues have been the subject of considerable interest. We now address a problem which has generated controversy in the literature during recent years. In a series of diamagnetic ruthenium and osmium complexes of the N-phenyl-o-quinonediimine ligand (L) it was suggested that the central low-spin MII ion (nd6, S=0) is coordinated by neutral o-quinonediimine ligands. We have revisited the problem to establish the optimum description of electronic structures in three relevant complexes OsCl2L2 (1), RuCl2L2 - (2) and Ru(acac)2L (3), Lº = N-phenyl-o-quinonediimine and acac = 2,4-pentanedionato, by using X-ray crystallographic data along with spectroelectrochemical and EPR studies. The results have shown that there is a clear and understandable structure difference between the osmium and ruthenium analogues 1 and 2, caused by the preference of the heavier homologue for higher oxidation states, and between 90  IACS ANNUAL REPORT 2007-08 the two ruthenium compounds 2 and 3, caused by the strong donor effect of the acac- ligands.

8. Coordination Chemistry of Anions and Sensing of Ions

P Ghosh

A) The selective binding and separation of halides, tetrahedral oxyanions (e.g. sulphate, phosphate, perchlorate) are frequently invoked as potential solutions to a number of fundamental problems of current interest. We have developed pentafluorophenyl- substituted tripodal amine receptor for encapsulation of chloride and bromide within the 1 C3-symmetric cavity of the receptor. H-NMR titration results indicated stronger binding of halides in our case compared to phenyl-substituted analogous receptor which may be attributed to the significantly more acidic nature of binding sites in our system due to the electron-withdrawing character of pentafluorophenyl groups and anion···pi interactions observed in crystal structures. In case of pentafluorophenyl substituted tripodal urea receptor we have shown formation of a pseudo dimeric cage which also encapsulates a phosphate dimer via numerous hydrogen bonding and anion···pi interactions. This neutral receptor also showed very high association constant toward dihydrogen phosphate. Further, we have explored hexabromide salt of a tiny cryptand as receptor for lower homologue halides (fluoride and chloride). We have also synthesized a new indole based macrobicyclic receptor to probe its binding toward metal ions and anions.

B) The development of molecular fluorescent sensors for metal ions is an area of immense research interest in recent years. Cu(II) is the third most important trace metal ion in various biological systems and one of the most important environmental pollutant. In this regards we have synthesized three tripodal fluoroionophores. These fluoroionophores are designed based on the fluorophore–spacer–receptor format (choice of fluorophore in all three cases is anthryl unit). Detailed fluorescence emission studies on these fluoroionophores in the presence of different cation inputs showed that fluoroionophore having N4 donor sets bearing three p-methoxy benzyl units attached to the three nitrogen centers involving photoinduced electron transfer process is a viable candidate for enhancement of fluorescence with Cu(II) input. In the absence of p-methoxy benzyl units at the nitrogen centers’ resulting system, shows quenching of fluorescence with the Cu(II) under same experimental conditions.

9. Dioxygen Activation by Model Complexes for Non-heme Iron enzymes

T K Paine

Oxidase and oxygenase enzymes use relatively unreactive O2 in biochemical reactions. Many of the mechanistic strategies used in nature for this important reaction within the 2-histidine-1-carboxylate facial triad family of non-heme iron(II) enzymes. The 2-His-1-carboxylate facial triad serves as an excellent monoanionic three-pronged platform for binding divalent metal ions. Tridentate facial N,N,O-donor ligands are particularly interesting as they can coordinate facially to the iron(II) centre leaving three sites vacant for cofactor and dioxygen. The reactive oxygen intermediates can be trapped to characterize by different spectroscopic techniques and their reactions can be studied with potential organic substrates. The activation of dioxygen and reactivity of the intermediate species are compared with other model complexes supported by tripodal and related ligands.

10. Polynuclear Exchange Coupled Metal Complexes as Building Blocks for Molecular Magnetic IACS ANNUAL REPORT 2007-08  91

Materials

T K Paine

The aim of this work is to optimize the synthetic strategies to prepare exchange coupled polynuclear clusters. Although a rationalized build-up of polynuclear metal complexes is still more a wish than a reality, the structures of compounds resulting from a systematic synthetic programme provide useful pointers to the parameters influencing cluster formation. One of the strategies to synthesize such molecules is to search for ligands capable of giving rise to molecules of high nuclearity and to find out suitable metal ions. The metal ions should have a large single-ion zero-field splitting. The strategy of using ‘metal complexes as ligands’ is applied and different complexes containing one or more metal centers are able to react further through available appropriate donor atoms. They should also exhibit ferromagnetic coupling to obtain ‘high spin’ molecules. Based on these concepts, we try to develop transition metal complexes of polynucleating oximate and oxamate ligands having potential application as molecular magnetic materials.

11. Synthesis, Characterization and Reactivity Studies of Porous, Multifunctional Metal Organic Frameworks

R Mondal

As a part of our ongoing project several novel 1D, 2D and 3D coordination polymers have been synthesized using a divergent sterically hindered polydentate ligand, methylenebis(3,5-dimethylpyrazole)

(H2MDP). Three novel 2D and 3D coordination polymers based on benzene polycarboxylic acids and

H2MDP has been reported. Structural investigation of these complexes reveals an interesting correlation between the angular disposition of the coordinating sites of the ligand and the resulting network.

An unusual event of conformational isomorphism has been reported recently. The title complex consists of two different conformations of a flexible ligand molecule within the same crystal leading to a novel interdigitated coordination polymer sustained by ð-ð stacking and hydrogen bonds.

One of the several factors that have a great impact on the final structural topology of coordination polymer is the nature of the counter ion present. The potential of H2MDP to produce interesting supramolecular arrays is evaluated with different counter ions.

It has been observed that the bridging ability of the anion has a drastic effect on the dimensionality of the resulting coordination polymer. 92  IACS ANNUAL REPORT 2007-08

DEPARTMENT OF Organic Chemistry

Brindaban Chandra Ranu, Senior Professor and Head Green synthesis; Use of ionic liquid for useful chemical transformations; Indium-mediated reactions; Catalysis by metal nanoparticle

Associates: (1) S Ghosh, SRF (CSIR); (2) K Chattopadhyay, SRF (CSIR); (3) L Adak, SRF (CSIR); (4) A Saha, JRF (CSIR); (5) S Bhadra, JRF (CSIR); (6) R Dey, JRF (CSIR); (7) D Saha, JRF (CSIR); (8) J Dutta (Hony); (9) I Mitra (Hony)

Ramanathapuram Vaideeswaran Venkateswaran, Senior Professor Stereocontrolled synthesis of Complex Natural Products

Associates: (1) B Biswas, RA; (2) S Ghosh, SRF (CSIR); (3) D Sarkar, SRF (CSIR); (4) A Roy, JRF (DST); (5) K Tuhina (Hony); (6) P K Sen (Hony)

Subrata Ghosh, Senior Professor Synthesis of complex natural products; enantioselective synthesis; development of new synthetic methodologies

Associates: (1) C Malik, SRF (CSIR); (2) S Maity, SRF (CSIR); (3) S Mondol, SRF (CSIR); (4) K Matcha, JRF (CSIR); (5) R N Yadav, JRF; (6) F Hussain, JRF (CSIR); (7) M Ghosh, Woman Scientist (DST); (8) T Bhowmik, SRF (Hony) (9) S Bose, JRF (Integrated Ph.D)

Saswati Lahiri, Senior Professor Exploratory organic photochemistry; cycloaddition reactions

Associate: (1) I Chakraborty, SRF; (2) S Yadav, SRF; (3) S Banerjee, SRF; (4) A Ghosh (Hon)

Subhas Chandra Roy, Senior Professor Stereocontrolled synthesis of bioactive natural products and related compounds; development of new synthetic methodologies

Associates: (1) S Jana (upto December 31, 2007); (2) S K Mandal, SRF (CSIR); (3) M Paira, SRF (CSIR); (4) S Saha, JRF (CSIR)

Amitabha Sarkar, Senior Professor Organometallic chemistry and catalysis; Nanoparticles and organometallic markers for biomolecules in solution and on surface

Associates: (1) S Mukherjee, RA; (2) S Sawoo, SRF (CSIR); (3) A Pal, SRF (CSIR); (4) D Srimani, JRF (CSIR); (5) A Chakraborty, JRF (CSIR); (6) P Dutta, JRF (CSIR); (7) R Ghosh, JRF (CSIR) IACS ANNUAL REPORT 2007-08  93

Parthasarathi Dastidar, Associate Professor Crystal Engineering; Supramolecular Chemistry; Molecular Gels; Molecular nanotubes; Coordination polymers and microporous materials; Crystal Growth

Associates: (1) N N Adarsh, SRF; (2) P Sahoo, JRF (CSIR); (2) S Banerjee, JRF; (3) T K Adalder, JRF (DST); (4) U K Das, JRF (DST)

Surajit Sinha, Assistant Professor Organic synthesis and chemical biology

Associates: (1) G Jana, JRF (CSIR); (2) K Goswami, JRF (CSIR); (3) S Pattanayak, JRF (CSIR); (4) S Paul, JRF (CSIR)

1. Stereocontrolled Synthesis of Complex Natural Products

R V Venkateswaran, S Ghosh, S C Roy and S Sinha

A total synthesis of heliannuol B, an important component of the heliannuol group of allelopathic sesquiterpenes has been realized. Controlled ring opening of an alkylated lactone and a ring closing metathesis were the key features of the synthesis. With this, we have achieved the synthesis of all the five primary components of the heliannuols. In further application of the direct Bargellini condensation of coumarins developed by us, the synthesis of heliannuol A, heliannuol C and helianane have been accomplished employing this protocol.

The generality of the novel radical induced selective cleavage of a cyclopropane ring in a cyclpropane fused benzoxepane ring system was further demonstrated by application to the synthesis of an advanced intermediate for the bioactive sesquiterpenes, dihydrocalamene.

A total synthesis of alboatrin, a phytotoxic metabolite has been accomplished. This encloses a highly labile linearly fused tetrahydrofurano benzopyran ring system rarely encountered in natural products. An intramolecular ketene-alkene cycloaddition followed by an oxidative ring enlargement was employed to generate the central core of the molecule.

An enantiodivergent approach to the synthesis of both enantiomers of epi-nor-candensolide, nor- canadensolide and canadensolide has been developed.

A novel approach using a domino metathesis sequence involving ROM-RCM-CM of substituted norbornene derivatives has been developed to construct densely functionalised ring systems present in anticancer diterpene umbellactal.

Titanocene(III) chloride mediated radical-induced synthesis of C-3 substituted 3,4-dihydroisocoumarins in a single operation with moderate to good yields from ethyl 2-bromomethyl benzoate and an aldehyde has been achieved. Total synthesis of a natural product Hydrangenol has been accomplished using the radical technology.

A detailed study has been performed for the synthesis of 7- and 8-membered cyclic ethers by radical cyclizations of epoxides using titanocene(III) chloride as the radical source. The aromatic annulated medium-sized oxacyclic rings are important core structures of many naturally occurring bioactive compounds.

Advanced intermediates towards the synthesis of indoloazepine and its derivatives including iboga- alkaloids have been accomplished. Synthesis and biological evaluation of indoloazepines and iboga- alkaloids will be completed in due course. 94  IACS ANNUAL REPORT 2007-08

2. Development of New Reagents and Synthetic Methodologies

B C Ranu and S C Roy

Ionic liquids have been used as catalyst and reaction media for several reactions including synthesis of highly substituted pyridines, dithiocarbamates and cleavage of aziridines and epoxides, and halogenations of carbonyl compounds. Metal nanoparticles have been exploited for catalysis in Heck reaction, Tsuji-Trost reaction, aryl-sulfur bond formation and Hiyama coupling. A sodium bromide/ bromate couple has been used as a green brominating agent for stereoselective bromination of alkynes and alkenes. Allylindium reagents have been used for the synthesis of terminal alkynes and trisubstituted alkenes by coupling reaction.

Synthesis of bis(indolyl)methanes has been achieved in aqueous medium catalysed by molybdenyl acetylacetonate in water medium. Vibrindole A, a bacterial metabolite and biologically active 3,3’-diindolyl methane have been successfully synthesized in excellent yield using this methodology.

A mild and efficient chemoselective deprotection of acetonides of diacetone glucose derivatives and deprotection of cyclohexyl protected diols have been developed using a catalytic amount of ceric ammonium nitrate (CAN) in moist acetonitrile.

A mild and efficient methodology for the preparation of synthetically important substituted a-methylene-g-butyrolactones has been developed in satisfactory yields via titanocene(III) chloride promoted radical Barbier-type reaction of methyl 2-(bromomethyl)acrylate and aldehydes followed by in situ lactonization.

A carbohydrate-based synthesis of both cis- and trans-fused bicylic ethers has been achieved by radical cyclization of epoxides using titanocene(III) chloride as a radical source. While the trans-fused compound has allowed stereoselective radical cyclization, the cis-fused has ended up only in a mixture of isomers. a-Dehydro-b-amino esters have been synthesized regioselectively from acetates of Baylis-Hillman adducts with amines in the presence of a catalytic amount of ceric ammonium nitrate. The regioselectivity does not differ with respect to the polarity of the solvent.

3. Photochemistry

S Lahiri

The usual ketene formation by 1,5-phenyl migration from (7-oxobicyclo[2.2.2]oct-2-ene-2,3-diyl) bis(phenylmethanone) derivatives on irradiation was quenched in triethylamine by photoinduced electron transfer mechanism. In protic solvent the reaction yielded two isomeric trans-hydrogenated products. Simple hydrogenation of these compounds in presence of Pd/C gave furan derivatives. Quantum chain process for one of the photoproducts was identified from the photoreactions of rigid d-keto-b,g-enones. Electron transfer reaction from naphthyl anlogue of chalcones has been used successfully to prepare copper nanoparticles.

4. Organometallic Chemistry

A Sarkar

Functional monolayers have been created on gold, silica or glass surfaces using alkene metathesis or ‘click’ chemistry as key reactions to introduce a Fischer carbene moiety on the exposed terminus. Such IACS ANNUAL REPORT 2007-08  95 a surface readily immobilizes protein and other biologically relevant molecules through a covalent linkage mediated by the organometallic functional group. The efficacy oof such immobilisation has been established by AFM, ATR, ellipsometry and related surface analytical techniques. Besides, nickel nanoparticles have been shown to efficiently catalyse a Suzuki-type coupling reaction of lipophilic aromatic molecules in aqueous medium

5. Crystal Engineering and Supramolecular Chemistry

P Dastidar

The group under the guidance of Dr. P Dastidar is associated with the research in the area of crystal engineering and supramolecular chemistry in general and molecular gels and metal-organic frameworks (MOFs) in particular. The group is involved in highly inter-disciplinary field of research with the aim of 96  IACS ANNUAL REPORT 2007-08

designing novel gelling agents and MOFs. Various sophisticated techniques such as single crystal and powder X-ray diffractometry, high resolution microscopy (SEM, TEM, AFM) along with usual tools such as NMR, IR, various optical spectroscopies are being used to carry out the work. DEPARTMENT OF Physical Chemistry

Debashis Mukherjee, Senior Professor (on lien) and Director; also in the RCAMOS Many-Body Theories of Electronic Structure and Dynamics and Statistical Physics

Sankar Prasad Bhattacharyya, Senior Professor Theoretical Chemistry

Associates: (1) R K Hazra, SRF (CSIR); (2) S Ghosh, SRF (CSIR); (3) R Misra, JRF (Int PhD); (4) K Sarkar, JRF (CSIR); (5) A Mandal, RA (DST); (6) M Ghosh (Hon); (7) S Nandy (Hon); (8) R Sharma (Hon)

Deb Shankar Ray, Senior Professor Nonlinear dynamics and Statistical Mechanics

Associates: (1) D Banerjee, SRF; (2) D Barik, SRF (CSIR); (3) S S Riaz, SRF (CSIR); (4) S Dutta, JRF (CSIR); (5) P Ghosh, JRF (CSIR) (6) S Kar (Hon)

Kankan Bhattacharyya, Senior Professor and Head of the Department Ultrafast Laser Spectroscopy; Organized Assemblies

Associates: (1) S Ghosh, SRF (CSIR); (2) U Mondal, JRF (CSIR); (3) A Adhikari, JRF (CSIR); (4) S De, JRF (CSIR); (5) D Das, JRF (CSIR); (6) D Sasmal, JRF (CSIR)

Tapas Chakraborty, Senior Professor Infrared and electronic spectroscopy of molecules and clusters

Associates: (1) A K Samanta, SRF; (2) P Panda, SRF (CSIR); (3) B Bandopadhyay, JRF (CSIR); (4) A Mukhopadhyay, JRF (CSIR); (5) M Mukherjee, JRF

Debnarayan Nath, Professor Magnetic Field Effect (MFE) on Radical Pair (RP) System; High Resolution Spectroscopy of Super– Cooled Molecular Beam in Jet; Instrumentation

Associates: (1) D Das, SRF (CSIR); (2) P Roy, JRF

Satrajit Adhikari, Associate Professor Classical and Quantum dynamics; Non-Born-Oppenheimer effects; Molecule-surface scattering; Reaction dynamics; Photo-dissociation dynamics IACS ANNUAL REPORT 2007-08  97

Associates: (1) A Paul, JRF (CSIR); (2) S Sardar, JRF (CSIR); (3) P Mondal (Integrated Ph.D)

1. Ultrafast Dynamics in Organized Assemblies

K Bhattacharyya

We have continued to study many ultrafast processes e.g. solvation dynamics, proton transfer, electron transfer and fluorescence resonance energy transfer (FRET) using a femtosecond up-conversion facility setup under the IRHPA program of DST. Dynamics in different regions of an organized assembly has been studied through excitation wavelength dependence. The most interesting recent application of this strategy was in the case of an ionic liquid. We demonstrated that an ionic liquid and a microemuslion containing an ionic liquid are heterogeneous. The marked excitation wavelength dependence in an ionic liquid suggests nano-structural organization with clear demarcation of a polar and non-polar region. The other interesting observation is ultrafast dynamics in a gel. It is proposed that the “voids” in close packed polymer (triblock co-polymer) gel accounts for the ultrafast dynamics. Excitation wavelength dependence of FRET has been studied in a P123 micelle and gel. Excited state proton transfer and solvation dynamics are studied in a supra-molecular assembly of P123 and a surfactant.

2. Magnetic Field Effect MFE) on Radical Pair (RP) Systems

D N Nath

MFE on Pyrene-DMA RP has been studied in a reverse micelle of D2O/AOT/n-heptane and the results have been compared with these in H2O/AOT/n-heptane to understand the effect of deuterium on MFE. MFE on Py-DMA RP system has been further studied in THF/DMF mixed solvent. The MFE has been resolved over the exciplex band and the study indicates presence of multiple exciplexes, relaxed and unrelaxed, in the mixed solvent with respect to solvent reorganization. Studies have also been made on the MFE on the photoinduced electron transfer between thioxanthone and various electron donor like indole, skatole, phenol and BSA protein in SDS micelle.

3. Molecular Spectroscopy

T Chakraborty

We investigate the weak molecular interactions (van der Waals, hydrogen bonding, etc.), which are responsible for shapes of molecules and molecular complexes in the ground electronic state, and dynamics of electronic energy flow processes following excitations to their higher laying electronic states. The shape and structure of an isolated molecule or a molecular complex, either in a supersonic jet expansion (gas phase) or in a cold inert gas matrix environment, is determined by measuring the vibrational frequencies of the structure sensitive intra or intermolecular modes by direct infrared absorption or laser-induced fluorescence spectroscopy. The signatures of electronic energy flow following excitation to a specific level in a higher electronic state that give detailed information of energy flow dynamics, is investigated in spectral domain by measuring the dispersed fluorescence spectra.

5. Nonlinear Dynamics and Statistical Mechanics

D S Ray

Nonlinear dynamics of spatially extended reactive systems has been explored in several contexts. First, by analyzing the condition for instability and pattern formation in reaction-diffusion systems beyond 98  IACS ANNUAL REPORT 2007-08 linear regime it has been shown that nonlinearity present in the kinetic terms can be instrumental in determining stability even to the extent of destabilizing one in a linearly stable parameter regime. Second, influence of a thermal gradient on a reaction-diffusion system has been examined to show how the imposed gradient destabilizes a chemical front via Soret effect giving rise to both absolute and convective instability. Third, consequences of delay in iodate-arsenous acid reaction under the influence of electric field has been analysed to demonstrate how delay incites an absolute instability in a system otherwise displaying varied wave-front characteristics, viz, convective and absolute instabilities and also stationary patterns.

Circadian oscillation is a biologically important chemical oscillation responsible for co-ordinating physiological activities of cells and bioorganisms over a 24-hour cycle of light and dark on earth. An intriguing feature of this nonlinear dynamics is that although velocity of a chemical reaction increases with temperature, Circadian oscillation is temperature compensated. Based on the distribution of activation energies around an experimental mean and averaging of rate constant we have proposed a theory of temperature compensation of Circadian rhythms.

6.1 Genetic Algorithms and High Performance Computing in Quantum Chemistry

S P Bhattacharyya

Parallel Genetic Algorithm driven methodologies have been tested further with specific reference to solving energy independent partitioned eigenvalue problems, Pareto optimal solutions to constrained variational problems. A new methodology has been developed to obtain the single particle density in Polythiophenes within the framework of Su-Schrieffer-Heeger Hamiltonian.

6.2 Quantum Dynamics

S P Bhattacharyya

Evolution of quantum states of diatoms under temporally discontinuous and spatially homogeneous perturbations has been studied. Optimal 4-frequency light fields have been constructed for achieving highly efficient photodissociation of diatoms.

6.3 Electronic Structure and Response properties of Quantum Dots

S P Bhattacharyya

Modulation of response properties due to size variation or the presence of impurities, achievement of targeted excitation in quantum dots by designing appropriately chirped pulses, development of a quantum adiabatic switching route to the impurity perturbed states of quantum dots highlight the work under this heading.

7.1 Formulation of Semi-classical, Quantum-classical and Quantum approaches from the first principle, and their numerical implementations

S Adhikari

The motivation to derive novel quantum-classical approach from first principle is a contemporary research in chemical physics to pursue the dynamics of multi-mode multi-surface systems with the best possible compromise between accuracy and speed. IACS ANNUAL REPORT 2007-08  99

7.2 Theoretical developments on Born - Oppenheimer treatment and non-adiabatic dynamics

S Adhikari

Non-adiabaticity is fundamental in chemical reaction, photo-absorption and photo-dissociation and has received serious attention during the last two decades for detailed understanding from the theoretical point of view. On the other hand, there are plenty of opportunity to explore this rich area of chemical physics namely: (a) The formulation of Extended Born-Oppenheimer equation from first principles; (b) The construction of quasi-diabatic Hamiltonian matrix for a given sub-Hilbert space.

7.3 Molecule-surface scattering with the inclusion of phonon modes and non-adiabatic effects

S Adhikari

Both experimental and theoretical calculations on molecule-surface scattering processes have advanced significantly during the last decades. Among the theoretical models proposed to mimic molecule-surface collision, the rigidness and the periodicity of the solid as well as the dynamics of the surfaces have been considered. We study the dynamics of the scattering process considering the influence of phonon excitation, the role of electronic excitation, the importance of surface corrugation and anomalies. 100  IACS ANNUAL REPORT 2007-08

Polymer Science Unit

Arun Kumar Nandi, Senior Professor and Head Polymer Gelation; Biomolecular Hybrid; Supramolecular Polymer and Polymer Nanocomposites

Associates : (1) D Dasgupta, RA; (2) S Manna, SRF; (3) A Garai, SRF; (4) A Saha, SRF (CSIR); (5) P Mukherjee, SRF (CSIR); (6) S Samanta, JRF (DST); (7) P Rauth, JRF (CSIR); (8) A Mandal, JRF (CSIR)

Tarun Kumar Mandal, Associate Professor Nanostructured materials based on Living Polymerization; Catalytic polymerization; Synthesis of metal/metal oxide nanostructures; Catalysis, Metal-peptide nanoconjugates; Self-assembly; Polymer- peptide conjugate; Sensors

Associates: (1) S Si, SRF (CSIR); (2) A Kotal, SRF; (IACS); (3) Md H Rashid, SRF (CSIR); (4) E Dinda, SRF (DBT/IACS); (5) T K Paira, JRF (CSIR); (6) M Raula, SRF (CSIR); (7) S Bannerjee, JRF (CSIR); (8) D Maity, JRF (CSIR)

Sudip Malik, Assistant Professor (Joined on 25.01.2008) Electroluminescent Polymers

Associate: (1) C Chakrabory, JRF

1.1 Polymer Gelation

A K Nandi

The gels of piezoelectric polymorph of poly(vinylidene fluoride) PVF2 has been prepared in ethylene carbonate. A detailed study on the morphology structure and phase diagrams of the gels are done. The rheology of PANI-CSA- m-cresol gel and its nanocomposite with MMT clay are studied. The shear viscosity exhibits Newtonian behavior for low shear rate (<2´10-4 s-1) and power law variation for higher shear rate. The zero shear viscosity (h0) and the characteristic time (l) increase but the power law index (n) decrease with increase in clay concentration. The storage modulus increases by 619% with the addition of 5% clay.

1.2 Conducting Polymer – Biomolecular Hybrid

A K Nandi

Poly(3- thiophene acetic acid) – ds DNA and poly(o-methoxy aniline) RNA hybrids are prepared and their properties are investigated. The former exhibit interesting UV-vis and photoluminescence properties. The later system exhibit slow uncoiling of POMA chain on RNA surface while the former system exhibit a slow aggregation of the polymer on DNA surface. Both the system would be useful for preparing biosensor.

1.3 Supramolecular Polymer IACS ANNUAL REPORT 2007-08  101

A K Nandi

The gelation mechanism of riboflavime (R) and melamine (M) supra molecular polymer has been evaluated from the microscopy and time dependent CD and photoluminescence spectra measurement. The results indicate that there are three steps for the hydrogel formation. (i) supra molecular complexation between riboflavine and melamine, (ii) conformotional ordering of the R-M complex and (III) Aggregation of the complex to produce fibrils which entrap water producing hydrogels.

1.4 Polymer-Nanocomposites

A K Nandi

Poly(vinylidene fluoride) (PVF2) – ester unctionalized-MWNT nanocomposites are prepared by solvent casting and melt cooled method. Good mixing occurs due to interaction of >C=O group of ester and >CF2 dipole of PVF2. The solvent-cast films have b-polymorphic structure whereas in melt-cooled samples mixture of a and b polymorph occurs. The I-V characteristics curves are interesting and at 5% MWNT content of solvent cast sample exhibit memory effect. Thin films of poly(3-hexyl thiophene)- Ag nanocomposites are prepared. While thin films of pure hexadecyl amine capped silver nanoparticles exhibit switching behavior, the nanocomposite thin film exhibit a characteristic of light emitting diode.

2.1 Nanostructured Polymeric Hybrids

T K Mandal

Hybrids of polyhedral oligomeric silsesquioxane (POSS) and polymer (such as PMMA, polystyrene, PBzMA) have been prepared by using thiol-mediated polymerization and ionic polymerization techniques from the surface of the POSS moiety. These hybrid materials were characterized by GPC, XRD, MALDI-TOF-MS, and DSC instrumental techniques. An attempt has been made to coat multi-walled carbon nanotubes (MWNT) uniformly with polymer using this thiol-mediated controlled polymerization technique. Polymer- peptide conjugates were also prepared by atom transfer radical polymerization and were assembled from different organic solvents, which resulted in the formation of nanospheres.

2.2. Synthesis of Metal/Metal oxide Nanostructures and Catalysis

T K Mandal

Polygonal gold and dendritic silver nanostructures have been prepared by modified citrate reduction technique. These metal nanostructures were then successfully used as effective catalysts towards the borohydride reduction of p-nitrophenols and aerobic oxidation of different hexoses. Nanostructured metal oxides of different shapes such as flower, spindle, lance, etc. have been prepared by wet- chemical technique at low temperature using water-soluble polymers as templates. The catalytic and photocatalytic activities of these metal oxides nanostructures have also been explored.

2.3. Redox Active Amphiphiles/Ionic Liquids for Metal Nanostructures Synthesis

T K Mandal

A series of newly deigned redox active amphiphiles containing either tyrosine or tryptophan residue of varying carbon chain length have been synthesized and were used to generate gold and silver nanoparticles by an in situ reduction approach at basic pH. These amphiphile-coated nanoparticles 102  IACS ANNUAL REPORT 2007-08 are then efficiently transferred from water to different nonpolar organic media. A series of ascorbic acid-based ionic liquids have also been synthesized for the in situ generation of anisotropic gold, silver and platinum nanoparticles.

3.1. Electroluminescent Polymers

S Malik

The work on the design, synthesis and physical properties study of electroluminescent polymers has been initiated. IACS ANNUAL REPORT 2007-08  103

Raman Center for Atomic Molecular & Optical Sciences

Debashis Mukherjee, Senior Professor (on lien from Department of Physical Chemistry) and Director

Many-Body Theories of Electronic Structure

Associates: (1) S Das, SRF (CSIR); (2) D Datta, JRF (CSIR); (3) R Maitra; (4) P Ghosh (Hon); (5) D Pahari, (Hon)

Manas Mukherjee, Assistant Professor Precision measurements with cold ions

Associates: (1) P Mandal, JRF (CSIR)

1. Precision measurements with cold ionic samples

M Mukherjee An ion trap based precision spectroscopy laboratory is presently being setup. In collaboration with GSI, Darmstadt this year we have also preformed a review on high precision Penning trap mass spectrometry with unstable nuclei.

2 Many-Body Theories of Electronic Structure

D Mukherjee

2.1 Spin-adapted combinatoric cluster expansion theory for strongly correlated nonsinglet states

We have developed an explicitly spin-free compact coupled cluster (CC) theory for simple open-shell systems, e.g. doublets, biradicals etc. which can be described either by a single open-shell determinant or by a configuration state function (CSF) which corresponds to a single spatial configuration but is a linear combination of determinants with different spin allocations. A new cluster expansion Ansatz for the wave-operator is introduced, in which the spin-free cluster operators are either of the form of closed-shell-like n hole-n particle excitations or contain valence excitations which may involve exchange spectator scatterings. These latter type of operators are allowed to contract among themselves through the spectator orbitals. The novelty of the Ansatz is in the choice of a suitable automorphic factor accompanying each composite of non-commuting operators, ensuring that each such composite appears only once. The resulting CC equations consist of two types of terms: one is direct and the other is folded and the latter involves the effective Hamiltonian operator. We emphasize that while the direct term terminates exactly at the quartic power of the cluster amplitudes, termination of the folded term is dictated by the valence rank of the effective Hamiltonian operator, just as in the spin-free open-shell CC theory with a normal ordered exponential Ansatz. Example applications are presented by computing the core and valence-ionized state energies of H2O and comparing the results with benchmark full CI results. The results are of spectacularly high quality. 104  IACS ANNUAL REPORT 2007-08

2.2 Development and Applications of Non-perturbative Approximants to State-Specific Multireference Coupled Cluster Theory (SS-MRCC)

We have proposed and applied an uncoupled approximation to the rigorous, size-extensive state- specific multireference coupled cluster theory (SS-MRCC), developed earlier. Both the parent formulation and the uncoupled approximant use the Jeziorski–Monkhorst Ansatz involving a different cluster operator acting on its corresponding model function. The approximant presented in this paper builds on a preliminary formulation earlier presented by us recently. The working equations of the SS-MRCC, following a set of physically motivated sufficiency conditions. Pilot molecular applications of the UC- SS-MRCC theory to the singlet states of CH2 and SiH2, which possess strongly multi-reference character and to the potential energy surface of the ground state of Li2 indicate the extreme closeness of the computed energies with those from the rigorous but more involved parent SS-MRCC theory. This establishes the potentiality and the efficacy of the UC-SS-MRCC approximation.

2.3 Generation of effective Hamiltonians for Electronic structure of nanotubes via eigenvalue independent partitioning technique

A subsystem, even if it strongly interacts with its environment, can be described by an effective Hamiltonian whose eigenvalues are precisely the same as the selected eigenvalues of the total system. This principle has been applied to develop an energy-independent partitioning scheme extracting an effective p-electron model from valence Hamiltonians. This effective Hamiltonian has been applied successfully to predict the onset of metallization of a (5,0) carbon nanotube. The method is simple, predictive and accurate.

2.4 Relativistic non[perturbative many body theories: Developments and Applications

Lifetimes of the first two metastable states in Sc2+ and Y2+ are determined using the relativistic coupled-cluster theory. We have made a comparative study of the correlation trends between the above doubly ionized systems with their corresponding neutral and singly ionized iso-electronic systems. The knowledge of the lifetimes of these excited states is very important in the field of astrophysics, especially for the study of post-main-sequence evolution of the chemically peculiar stars.

We have formulated and made applications of a novel relativistic unitary coupled cluster theory to atomic properties. The remarkable features of this theory are highlighted, and it is used to calculate the lifetimes of 5d 2D3/2 and 6p 2P3/2 states of Ba+ and Pb+ respectively. The magnetic dipole hyperfine constants for the 6s 2S1/2 state of Ba+ and the 6p 2P3/2 state of Pb+ have also been calculated. The results clearly suggest that it is very well suited for accurate ab initio calculations of properties of heavy atomic systems.

2 171 + The electric quadrupole moment for the 5d D3/2 state of Yb , has been calculated using the relativistic coupled-cluster method. The effect of inner core excitations and their contribution to the electric quadrupole moment has been presented, which is a property sensitive to regions away from the nucleus.

2 2 2 2 + The suitability of the narrow transitions 7s S1/2 ® 6d D3/2 and 7s S1/2 ® 6d D5/2 in Ra for optical frequency standard studies has been tested. Our calculations of the lifetimes of the metastable 6d states using the relativistic coupled-cluster theory suggest that they are sufficiently long for Ra+ to be considered as a potential candidate for an atomic clock. This is further corroborated by our studies of the hyperfine interactions, dipole and quadrupole polarizabilities, and quadrupole moments of the appropriate states of this system. IACS ANNUAL REPORT 2007-08  105

2 The low-lying n(=3,4,5)d D5/2 states of alkaline-earth-metal ions are of vital importance in a number of different physical applications. The hyperfine structure constants of these states are characterized by unusually strong electron correlation effects. Relativistic coupled-cluster theory has been employed to carry out ab initio calculations of these constants. We have aptly demonstrated of the power of the coupled-cluster method to cope with strongly interacting configurations.

Calculations of the weighted oscillator strengths and the transition probabilities for a few low-lying transitions of boron-like ions: Mg VIII, Si X and S XII have been carried out, which are astrophysically important, particularly in the atmosphere of the solar corona. We have employed an all-order relativistic many-body theory called the relativistic coupled-cluster theory to calculate very precisely these atomic quantities of astrophysical interest.

2.5 Study of possible consequences of Cp violation in atoms using relativistic coupled cluster theory

The enhancement factors of the electric dipole moment (EDM) of the ground states of two paramagnetic atoms; rubidium (Rb) and caesium (Cs) which are sensitive to the electron EDM are computed using 106  IACS ANNUAL REPORT 2007-08

the relativistic coupled-cluster theory and our results are compared with the available calculations and measurements. The possibility of improving the limit for the electron EDM using the results of our present work is pointed out. CENTRE FOR RENEWABLE ENERGY SOURCES

Debashis Mukherjee, Head

Asok Kumar Barua, Advisor Participating Scientists from other Departments / Units

Swati Ray, Energy Research Unit & Shyamal Saha, Materials Science

Associates: (1) T Jana, RA-II; (2) U Das, JRF

1. Development of Silicon Thin Film Solar Cells and Modules

A K Barua and S Ray

Technology transfer document for Amorphous Silicon Solar Cell Technology (developed at IACS) has been prepared and sent to M/S Hind High Vac. Pvt. Ltd. Bangalore. To start next phase of research, some modifications have been done in the power lines of the Prototype Multichamber deposition system. Attempts are being made to deposit large area (30cm x 30cm) microcrystalline intrinsic and p-type silicon layers in the Multichamber system. Conductivity and X-ray studies have been done on the films.

Amorphous Si/microcrystalline Si double junction 10 cm x 10 cm modules have been fabricated and current-voltage characteristics have been measured.

2. Catalytic growth of carbon nanotubes for low cost Fuel cell Electrode

S Ray

Carbon nanotubes (CNTs) have been synthesized by catalytic decomposition of turpentine oil using Ni nanocatalyst by spray pyrolysis technique. SEM images of the synthesized carbon clearly show the formation of CNTs with 50-70 nm diameters. The HRTEM analysis shows the presence of 45-50 graphene walls. The XRD patterns of as synthesized MWCNTs shows <200> peak of graphitic carbon and intensity of this peak is enhanced after purification. The purified MWCNTs can be used in fuel cells electrodes.

3. Development of transparent polymer and diamond like carbon thin films for Solar Cell

S Ray

Polymer-like amorphous carbon films are deposited by PECVD technique at a low substrate temperature of 200oC. Hydrogen content as high as 30 at % to 46 at % indicates formation of polymeric hydrogenated amorphous carbon. The SEM and TEM micrograph shows the presence of crystalline grains of 5 – 12 nm diameter in the amorphous matrix. The increase of RF power from 50 mW/cm2 to 150 mW/cm2 IACS ANNUAL REPORT 2007-08  107 increases the crystallinity and hardness, lowers the hydrogen content drastically to a very low value of ~1.0 at %. The higher crystallinity and hardness of the films at higher RF power (150 mW/cm2) indicates formation of diamond like carbon films.

4. Synthesis and characterization of composite materials for organic Solar Cell application

S Saha

Thin films of composite materials containing carbon nanotubes and conjugated polymers and hybrid materials of conjugated polymers with inorganic nanoparticles have been fabricated and characterized 108  IACS ANNUAL REPORT 2007-08

both optically and electrically to use these films as active materials in organic solar cell. Several electron transport and hole-transport materials will be used to fabricate multilayer structures to enhance the efficiency. CENTRE FOR ADVANCED MATERIALS (CAM)

Dipankar Das Sarma, MLS Chair Professor of Physics Strongly correlated electron systems (magnetism, metal-insulator transition, phase separation, multiferroics); Semiconducting nanoparticles (Optical and electronic properties, growth studies, novel synthesis) Conducting polymers; high-energy electron spectroscopies (photoelectron spectroscopy, inverse photoemission spectroscopy, Auger electron spectroscopy, x-ray absorption spectroscopy)

Associates: (1) N Sekhar Karan, JRF (CSIR); (2) S Jana, JRF (CSIR); (3) S Middey, JRF (CSIR); (4) A Nandi, JRF (CSIR); (5) B B Srivastava, JRF (CSIR); (6) R Ganguli, RA (DST); (7) R Sarkar, RA (DST) (8) P Anil Kumar, SRF; (9) T Chakraborty, JRF; (10) S Panda, JRF

Strongly correlated electron spectroscopy and semiconducting nanoparticles

D D Sarma

The major research activities of our group are in the field of strongly correlated electron systems and semiconductor nanoparticles in the quantum confinement regime. We are actively involved in studying the electronic, magnetic and dielectric properties of different materials such as manganites, double perovskites, dilute magnetic semiconductors and also multiferroics, both experimentally as well as theoretically. There are serious attempts to discover new useful multiferroic and dielectric materials and also to understand the nature of unusual magnetic responses in comparatively uncorrelated 4d materials. Our group is also particularly active in understanding various aspects of doping, optical properties, and growth mechanisms of various nanoparticles in the nanometric size regime using the IACS ANNUAL REPORT 2007-08  109

so-called bottom-up approach. Our recent results on doped nanomaterials provide important insight in understanding the universal nature of doping and ion solubility in a material matrix. INTER-INSTITUTIONAL COLLABORATION

1. Electronic structure and Magnetism in TM doped ZnO

G P Das (Department of Materials Science, IACS) and D Karmakar (BARC) and I Dasgupta (IIT- Bombay)

The electronic structure and related magnetic properties of Fe-doped ZnO system is analyzed in presence of both O- and Zn-vacancy in the framework of TB-LMTO-ASA method within DSA. Although for the Fe-doped ZnO system, the ground state is antiferromagnetic, in presence of O- and Zn-vacency the magnetic mechanism is drastically altered. Utilizing the two-centered tight binding model of Anderson and Hasegawa, we have investigated the nature of the two competing interactions: antiferromagnetic superexchange versus ferromagnetic double exchange interactions, as a function of the Fe-Fe separation by supercell calculations. The results reveal that for obtaining long-ra nge half-metallic ferromagnetism, Zn-vacancy is more crucial that O-vacancy.

2. Effect of correlation on structural and magnetic phases of CeMnNi4

G P Das (Department of Materials Science, IACS), M S Bahramy, P Murugan, and Y Kawazoe (IMR, Sendai)

CeMnNi4 is a unique intermetallic soft ferromagnet discovered recently, which exhibits large magnetic moment (~4.95µâ/Mn), reasonably high Curie temperature (~150K), and a high degree of spin polarization (~66%) as seen by PCAR spectroscopy. Recent LSDA calculations for the cubic phase reveal FM phase to be stable, and the resulting magnetic moment as well as mea field estimation Curie temp are in close agreement with experimental values. The large moment mainly originates from the Mn atoms, while Ce and Ni atoms have small induced moments of opposite sign. LSDA calculations however have failed to reproduce (a) the correct ground state structure which is cubic and (b) the degree of spin-polarization P which is significantly underestimated. We have shown for the first time that by explicit inclusion of the Coulomb U-parameter within LSDA+U formalism, the structural phase stability as well as transport spin

–polarization in CeMnNi4 can be correctly described. Our study reveals for the first time, the cross-over from hexagonal to cubic phase, as a function of the (U,J) parameters on all the three constituents viz. Ce, Mn and Ni, in this interesting intermetallic compound. 110  IACS ANNUAL REPORT 2007-08

Staff & Students Matters

(i) Awards / honours received from Scientific Organization / Govt. Sector / Industries as per table below :

Name of the Organization Awards / honours received Name of the Faculty/Staff/ Fellow

Materials Science

West Bengal Academy of Science and Elected Fellow B N Dev Technology

Materials Research Society of India Young Scientist Award S Ray

LNJ Bhilwara Group LNJ Bhilwara Research N Pradhan Fellowship

Spectroscopy

Indian Photobiology Society, Kolkata Vice President T Ganguly

Indian Physical Society, Kolkata Vice President T Ganguly

Theoretical Physics

UNESCO-MCBN, USA William J Whelan Fellowship B Mallick Award, 2008

Energy Research Unit

Solar Energy Society of India Photovoltaic R & D Award S Ray

Biological Chemistry

The Science Association of Bengal Dr. Jnan Chandra Ghosh M Ray Memorial Award-2008

B M Birla Science Centre B M Birla Science Prize in P K Das Chemistry

Inorganic Chemistry

Indian Science Congress Association ISCA Young Scientist Award P S

IACS ANNUAL REPORT 2007-08  111

Lakshminarayanan

Organic Chemistry

Indian National Science Academy, New Delhi Fellowship (FNA) B C Ranu

Chemical Research Society of India Bronze Medal S C Roy

West Bengal Academy of Science and Elected Fellow S C Roy Technology

Physical Chemistry

Third World Academy of Sciences (TWAS) TWAS prize in Chemical K Bhattacharyya Science for 2007

Chemical Research Society of India Vice President K Bhattacharyya

Raman Center for Atomic Molecular & Optical Sciences

Asia-Pacific Association of Theoretical and Fukui Medal of the, 2008. D Mukherjee Computational Chemists (APATCC)

The Asian-Pacific Consortium on Theoretical Fellow and Board Member D Mukherjee and Computational Chemistry

Centre for Advanced Materials

Federation of Indian Chamber of Commerce FICCI Award 2006-07 D D Sarma and Industry

American Physical Society (APS), 2007 Fellow D D Sarma

Thirld World Academy of Science Elected Fellow of TWAS 2007 D D Sarma

Indian National Science Academy INSA K R Rao Memorial D D Sarma Lecture, 2008

Tata Institute of Fundamental Research Adjunct Professor, TIFR D D Sarma 2007 - 2009

Indian Institute for Science Education and Adjunct Professor, IISER D D Sarma Research

Dept. of Science & Technology, Govt. of India J C Bose National Fellow D D Sarma 2006-2011 112  IACS ANNUAL REPORT 2007-08

(ii) Lectures / Seminars organized by the Departments / units as per table below:

Name of the Speaker Topic Name of the Organizer

Materials Science

Dr. R Groetzschel, Institute of Ion Advanced Ion Beam Analysis for B N Dev Beam Physics and Materials Research, Ultra Thin Film Studies Research Centre, Dresden-Rossendorf, Dresden, Germany

Dr. L Bischoff, Institute of Ion Beam Ion Beam Synthesis of Nanoclusters B N Dev Physics and Materials Research, and Nanowires Research Centre, Dresden-Rossendorf, Dresden, Germany

Dr. Prasenjit Sen, Harish-Chandra Tuning magnetic properties through G P Das Research Institute, Allahabad size and composition in atomic cluster

Prof. Mojmir Sob, Masaryk University, Electronic structure and atomic Brno, Czech Republic configura- tion of interfaces in G P Das metallic material

Dr. Chiranjib Majumder, Bhabha Small Size, Large Expectations: G P Das Atomic Research Centre Tuning the electronic properties of materials by first principles calculations

NUS Delegation led by National University of Singapore – G P Das Prof. B V R Chowdari Collaboration with Indian Universities / Institute

Dr.Swadeshmukul Santra, Nanoscience Engineered Nanostructured Materials S K De Technology Center, University of Central Florida, USA

Dr. Jay Chakraborty, General Electric Interdiffusion and stress in Cu-Pd S K De Global Research Center, Bangalore bilayer thin films: X-ray diffraction study

Solid State Physics

Prof. Sung-IK Lee, Pohang University Concurrent Magnetic Metal-Insulator Department of Science and Technology, Republic Transitions in Eu1-xSmxB6 single crystal of Korea

Prof. Per Nordblad, Angstrom Low Dynamics in Disordered Magnets -do- Laboratory, Uppsala, Sweeden

Theoretical Physics

Dr. S Sarkar, Poorna Prajna Research Superconducting Quantum Dots -do- Institute, Bangalore IACS ANNUAL REPORT 2007-08  113

Dr. D Roy, RRI, Bangalore Electrical Transport in a One -do- Dimensional Conductor with Inelastic Scattering by Self Consistent Reservoirs

Prof. S R Das, Dept. of Phys., Space-time Singularity and holography -do- Kentucky, USA

Dr. K Sengupta, SINP, Kolkata Low Dimensional and Strongly -do- Correlated Systems

Dr. A Dasgupta, University of New Semi classical Horizons -do- Brunswich, Canada

Dr. T K Dey, IOP, Bhubaneswar Phase Transitions in Asymptotically -do- ADS Black Holes and Gauge Theory Duals

Dr. T K Das, HRI, Allahabad Black Holes in a Bathtub -do-

Dr. R Chakrabarti, IISc, Bangalore Diffusion of Macromolecules Across -do- the Nuclear Pore Complex

Dr. S Basak, Indiana University, USA Lattice QCD determination of baryon -do- resonances

Prof. D Chowdhury, IIT, Kanpur Molecular machines: packers and -do- movers, assemblers and shredders

Prof. N C Chandra, IIT, Kharagpur Quantum Information and Quantum -do- entanglement, Lecture- I

Dr. J Majumdar, Helsinki Institute of String Cosmology -do- Physics, Finland

Prof. N C Chandra, IIT, Kharagpur Quantum Information and Quantum -do- entanglement, Lecture- II

Dr. T Stauber, Instituto de Ciencias de Electronic properties of grapheme: -do- Materiales, Madrid (CSIC) from semi-classical transport to correlated quantum dots

Dr. S Bhattacharya, HRI, Allahabad Non-universal gaugino masses : a signal -do- based analysis for the Large Hadron Collider

Dr. P Bandyopadhyay, HRI, Allahabad Associated Higgs Production in CP- -do- violating super symmetry : probing the ‘open hole’ at the Large Hadron Collider

Dr. S Bhattacharya, Delhi University Discoveries in LHC : possibilities and -do- challenges

Dr. A Mukherjee, Dept. of Phys., IIT, Structure of the Hadron in position -do- Bombay space

Dr. A Sinha, Perimeter Inst., Canada The fast life of holographic mesons -do- 114  IACS ANNUAL REPORT 2007-08

Dr. A Basu, IAS, Princeton Higher Derivative Corrections in String -do- Theory

Dr. R Anishetty, IMSc, Chennai Long distance Orientational Correlations -do- in Liquid Water and Shape Dependant Hydrophobic Force

Dr. R Paul, Univ. of California, Davis, Mechanical regulation of cell -do- USA contractility and spontaneous cell patterning

Energy Research Unit

International Conference, SOLACE at Silicon Thin Film Solar Cells S Ray Cochin Univ., January 21-23, 2008

The 10th IUMRS International Structural studies of Protocrystalline S Ray Conference on Advanced Materials, Silicon Film: A material developed for October 8-13, 2007 absorber layer of solar cells

National Symposium on Recent Trends Computer modeling of ‘Heterojunction P Chatterjee in Renewable Energy Technologies at with Intrinsic Thin layers (HIT)’ Solar HNB Garhwal University, Uttaranchal, Cells March 26-28, 2008

Laboratoire de Physique des Interfaces Why does the open-circuit voltage of P Chatterjee et des Couches Minces, Ecole a microcrystalline silicon PIN solar cell Polytechnique, Palaiseau, France, July decrease with increasing crystalline 23, 2007 volume fraction?

Course lectures (Total 15 lectures) at Physics of Semiconductor Devices P Chaudhuri Jadavpur University’s M.Sc electronics course between September 2007 and February 2008 as guest faculty

Inorganic Chemistry

Dr. Sumit Khanra, University of Exchange Coupled Polynuclear Metal Department Manchester, UK, May 04, 2007 Complexes

Dr. J-M Latour, Grenoble, France, Biomimetic Diiron Complexes: Electron -do- October 11, 2007 Exchanges and Atom Transfers

Mr. Siddhartha Das, Yale University, Biomimetic Inorganic Chemistry -do- USA, November 30, 2007

Dr. Frantisek Hartl, University of Redox-responsive Metallic Chains and -do- Amsterdam, The Netherlands, Conjugated Molecular Bridges December 04, 2007

Dr. Abhishek Dey, Stanford University, S K-edge XAS and DFT Calculations -do- USA, December 05, 2007 on Iron-Sulfur Active Sites: Role of H-bonding in tuning Electronic Structure and Reactivity IACS ANNUAL REPORT 2007-08  115

Mrs. Somdatta Ghosh Dey, Stanford Cu Active Sites in Bacterial -do- University, USA, December 07, 2007 Denitrification Cycle

Dr. Abhik Ghosh, University of The Unique Chemistry of Low- -do- Tromso, Norway, March 13, 2008 Coordinate Stereochemistries: Aspects of Transition Metal NO and Imido Complexes

Mr. P S Lakshminarayanan, Dept. of Halide Encapsulation in Tripodal and -do- Inorganic Chemistry, IACS, March 19, Caged Receptors 2008

Organic Chemistry

Prof. M H Ali, Dept. of Organic Fluorus Phase in Organic Reactions -do- Chemistry, Southeast Missouri State University, USA, July 19, 2007

Dr. A Babu, Dept. of Chemistry, Indium Mediated Regio- and -do- University of Osaka, Japan, February Stereoselective Carbon-Carbon Bond 14, 2008 Formation

Dr. Gopal C Kundu Understanding the Molecular Mechanism -do- National Center for Cell Science, of Tumor Growth and Angiogenesis in Pune, February 27, 2008 Breast and Prostate Cancers by Chemokine like Protein, Osteopontin

Dr. S Kulkarni, University of California, One-pot Method for Glycomics -do- USA, April 02, 2008

Prof. Uday Maitra, Dept. of Organic Copper Catalyzed O-arylation of -do- Chemistry, Indian Institute of Science, Oximes Bangalore, April 03, 2008

Dr. Ganesh Pandey, National Chemical Asymmetric Desymmetrization: -do- Laboratory, Pune, April 04, 2008 Conceptual Creation to Synthetic Explorations

Physical Chemistry

Prof. Masanori Tachiya, Fellow, AIST, Stochastic Approach to Exciton -do- Tsukuba, Japan Annihilation Dynamics in Quantum Dots and Carbon Nanotubes

Prof. B Bagchi, IISc, Bangalore From enzyme kinetics to protein -do- (INSA J L Nehru Memorial Lecture) diffusion along DNA : New Approaches to old unsolved problems

W Becker, Becker-Hickl Co, Germany High resolution fluorescence lifetime -do- imaging by multidimensional TCSPC

Prof. E Arunan, IISc, Bangalore Microwave Spectroscopy -do- 116  IACS ANNUAL REPORT 2007-08

Dr. Pratik Sen, RIKEN, Japan Structure & Dynamics at Biological -do- Interfaces: Femtosecond Surface Sum Frequency Generation & Up-conversion

Polymer Science Unit

Dr. Shurit Ghosh Supramolecular Assembly – Disassembly A K Nandi Univ. of Massachusetts, USA in custom designed polymers and surfactant

Prof. Dusan Berek, Polymer Institute, Progress in liquid chromatography of A K Nandi Slovak Academy of Sciences, Slovakia synthetic polymers

Raman Center for Atomic Molecular & Optical Sciences

Sudarshana Saha, School of Chemistry, Experimental and ab initio study of a Department Bristol University, UK new delta state of the C3 radical

Dr. David Scherer, University of Vortex formation by merging of – do – Arizona independent BECs

Prof. Pradip Narayan Ghosh Can we stop and confine free atoms? – do – Dett. of Physics, Calcutta University

Prof. Lokesh Tribedi, Deptt. of Nuclear Electron emission in ionization of H2 – do – and Atomic Physics, TIFR and evidence of Young type interference: a molecular double slit

Prof. J Banerji, PRL, Ahmedabad Novel resonators and interferometers – do – using self-imaging wave guides

Subhadeep De, KVI, University of Laser cooling of atoms with a leaky – do – Groningen, Netherlands level scheme for testing fundamental symmetries

Jozef Noga, Comenius University, Towards high precision calculations of – do – Bratislava molecular energies and properties via explicitly correlated coupled cluster theory

Horst Köppel, Theoretical Chemistry, Nonadiabatic excited state dynamics – do – University of Heidelberg, Germany and photoactive biomolecular function

Prof. Marcel Nooijen First principles simulations of electronic – do – University of Waterloo, Canada spectroscopy

Dr. Kiran Sankar Maiti, Technishe A challenge to explore structure and – do – Universitaet Muenchen, Germany ultrafast dynamics of protein and peptide using 2D IR spectroscopy

Dr. K S Viswanathan, IGCAR Conformation of organic phosphates: – do – Matrix isolation studies

Prof. Mariusz Pawlak, Nicolaus The influence of an external electric – do – Copernicus University, Torun, Poland field and plasma environment on the hydrogen-like atom IACS ANNUAL REPORT 2007-08  117

Prof. Miroslaw Bylicki,Institute of Dirac Coulomb Model Treating Bound Department Physics, Nicolas Copernicus University, States as Resonances Torun, Poland

Dr. R Talukdar, NOAA, Boulder, USA Laboratory studies of critical – do – atmospheric processes

Mark R Hoffmann, Department of Generalized Van Vleck Perturbation – do – Chemistry, University of North Dakota, Theory and its Application to USA Molecular Electronic States

Mark R Hoffmann, Department of Inclusion of triple and quadruple – do – Chemistry, University of North Dakota, excitations to MRCISD USA

Prof. P Chowdhury, University of Protein polymerization and Peptide – do – Pennsylvania Hydration using Fluorescence correlation and infra-red spectroscopy

Dr. N Nayak, S N Bose National Reduction of quantum noise in spin – do – Center for Basic Sciences, Kolkata systems

Centre for Advanced Materials

Dr. Sameer Sapra, Physikalische Electronic and Optical Properties of D D Sarma Chemie, TU Dresden, Bergstr. 66b, Semiconductor Nanocrystals 01069 Dresden, Germany

Dr. Nilotpal Ghosh, UniversitÄat Single Crystal Growth by Float Zone D D Sarma Leipzig, Germany Technique : Stability and Controle & Physical Property Measurements

Dr. Saroj K Nayek, Rensselaer Nanoelectronics from First Principles: D D Sarma Polytechnic, Institute Troy NY 12180 From Electrons to Transistors

Professor Ashish Chainani Evidence for charge-order maximized D D Sarma The Institute of Physical and Chemical momentum-dependent superconductivity Research, RIKEN, Japan :Angle-resolved Photoemission spectroscopy of 2H-NbSe2

Dr. Prashant V Kamath, University of 1. Meeting Clean Energy Demand D D Sarma Notre Dame, Indiana, USA with Nanotechnology 2. Ethics of Publication and Presentation

Dr. Prashant V Kamath, University of Nanotube Architecture for solar cells D D Sarma Notre Dame, Indiana, USA and fuel cells

Dr. Prashant V Kamath, University of Quantum Dot Solar Cells D D Sarma Notre Dame, Indiana, USA 118  IACS ANNUAL REPORT 2007-08

(iii) Meeting / Conference held in the Departments as per table below:

Name of the Conference/ Symposia Duration Funding Convenor Authority

Materials Science Workshop on High Performance April 23-26, DST G P Das Computing 2007 IUMRS-ICAM-2007 Theme Symposium October 8-13, DST G P Das on Computational Materials Science 2007

Solid State Physics Workshop and Conference on Electronic January 14-18, Asia-Sweden I Dasgupta Structure Theory: Methods and 2008 Research Link Application Programme

Theoretical Physics IXth Summer School on Basic Sciences May 17–31, INSA, New Delhi J K Bhattacharjee (for school leaving students) 2007 1st Samar Biswas Memorial Lecture June 26,2007 J K Bhattacharjee Annual one day Monsoon seminar of August 14, 2007 J K Bhattacharjee Theoretical Physics in memory of Prof. C K Majumdar Sixty years after India’s Independence- August 17, 2007 J K Bhattacharjee one day seminar

Physical Chemistry Quantum Chemistry, Soft Computation April 04-05, DST, CSIR S Adhikari & and Optimization 2008 T Chakraborty

Polymer Science Unit Colloquium on Perspectives in Polymer 1 day IACS & SPSI A K Nandi Science & Technology, December 22, Kolkata Chapter 2007

Raman Center for Atomic Molecular and optical Sciences International Symposium on Atomic, January 10-12, DST, CSIR,DAE, D Mukherjee & Molecular and Optical Sciences & High 2008 JNCASR, M Mukherjee Performance Computing: A Seamless Reliance Industries, Frontier IIA, IBM Quantum Information Science – a day May 4, 2008 Registration B Deb & long workshop M Mukherjee

Centre for Advanced Materials First In-house symposium of CAM July 13, 2007 IACS D D Sarma CRP-Spintronics Review August 3, 2007 DAE D D Sarma Indo – Japan Workshop February 3 – 5, DST D D Sarma & 2008 A Fujimori IACS ANNUAL REPORT 2007-08  119

(iv) Invited talk delivered by the members of the Faculty as per table below:

Event Title of the talk Name of the Faculty /Staff/ Fellow

Materials Science

Refresher Course in Physics, Dept. of Atoms, Molecules and Ultra-intense S S Bhattacharyya Physics, Burdwan University, February lasers 28, 2008

Workshop on Mathematical Modelling Modelling, Simulation and Design of G P Das & its Engg Applics, B.P. Poddar Novel Materials Institute of Management & Technology, Kolkata, May, 2007

Materials Structure & Micromechanics First-principles thermodynamics G P Das of Fracture (MSMF-5), Brno, Czech approach to phase stability and Republic, June 27-29, 2007 microstructure in alloys

Technische Universitaet Clausthal, Phase stability, magnetism and spin- GP Das

Germany, June 13, 2007 transport in CeMnNi4 Max Planck Institut fuer Electronic structure of semiconducting G P Das Festkoerperforschung, Stuttgart, spintronics materials Germany, June 21, 2007

International Conference on Materials Electronic, Magnetic and Transport G P Das for Advanced Techmologies (ICMAT- properties of CeMnNi4 : a first 2007), Singapore, July 1-6, 2007 principles study

Nanyang Technology University, Nanomagnetism in Spintronics G P Das Singapore, July 12, 2007 Materials

National University of Singapore, Titanium decorated Silicon fullerene: G P Das September 10, 2007 Nanostructure for Hydrogen Storage

Conference of Asian Consortium for Nanomagnetism in Spintronics G P Das Computational Materials Science Materials (ACCMS-4), Seoul, South Korea, September 12-16, 2007

EU-India Grid Workshop, Pune, Large scale electronic structure and G P Das September 24-28, 2007 molecular dynamics simulation in nano-materials: some case studies

International Conference on Advanced Phase stability, magnetism and spin- G P Das

Materials (IUMRS-ICAM 2007), transport in CeMnNi4 : a first Bangalore, October 8-13, 2007 principles density functional study

The Indian Institute of Metals, NMD- Nanostructures for Hydrogen Storage: G P Das ATM-2007, Mumbai, November13-16, an emerging scenario 2007 120  IACS ANNUAL REPORT 2007-08

Sanjay Sen Memorial Lecture, Indian Quo Vadis Nanoscience and G P Das Leather Technologists Association, Nanotechnology Kolkata, January 14, 2008 Sweden-India Research Network Conf Structural, electronic and magnetic G P Das on Electronic Structure: Theory & properties of doped clusters Applics, January 17-18, 2008 ACCMS-VO Meeting, Sendai, January Diluted Magnetic Semiconductors and G P Das 26-28, 2008 Dielectrics Int. Conf. on Materials Science Exploiting elelctron’s spin for new G P Das Research and Nanotechnology, generation device materials Kodaikanal, February 27-29, 2008 India-Singapore Symp on Current The issues and challenges of hydrogen G P Das Trends in Physics, IIT, Madras, storage: from bulk to nano February, 2008 Colloquium at Institute of Physics, Magnetism in nanoscale systems and B N Dev Bhubaneswar, May 21, 2007 intriguing dual nature of ion irradiation International Conference on Advanced Detecting atomic migration with sub- B N Dev Materials, IUMRS-ICAM 2007, nanometer precision and understanding Bangalore, October 8-13, 2007 magnetism in a multilayer Bangalore Nano 2007, Bangalore, Transforming a nonmagnetic multilayer B N Dev December 6 -7, 2007 medium into a ferromagnetic medium and vice versa: Implications in nanotechnology Colloquium at Viswa Bharati University, Magnetism in Nanoscale Systems B N Dev Shantineketan, December 14, 2007 Third Indo-Japan Conference on Transforming a nonmagnetic system B N Dev Ferroics and Multiferroics, Kolkata, into a ferromagnetic system and vice February 4-6, 2008 versa by ion irradiation 37th National Seminar on Understanding atomic displacement B N Dev Crystallography, Kolkata, February 6-8, and migration, and magnetic 2008 transformation in multilayered materials using X-ray standing waves 4th National Workshop on Characteri- Seeing Atoms and putting them to B N Dev zation of Laser and Nanomaterials, work Burdwan University, March 7-9, 2008 Indo-JapanWorkshop on Quantum Applications of X-ray standing waves B N Dev Beam Science, SINP, Kolkata, March in surface and nanoscale science 7-12, 2008 Workshop on Materials Characterization Ion irradiation effects on the magnetic B N Dev and Surface Modification in Research behaviour in layered structures and Industry using Ion Accelerator, Bhubaneswar, Marh 31–April 04, 2008 Banaras Hindu Univer-sity, Invited Transport and dielectric properties of S K De Lecture conducting polymer nanocomposites IACS ANNUAL REPORT 2007-08  121

Recent advances in Materials Science, Conducting Polymer S K De Ramananda College, Bishnupur One day seminar on Catalysis: Recent Design, synthesis and Potential A Bhaumik Trends held in National Chemical applications of microporous and Laboratory, Pune on November 29, 2007 mesoporous materials Department of Physics, University of Doped Nanomaterials and Their A Patra Texas, Arlington, USA, on September Properties 14, 2007 Optical Society Meet-ing 2007, San Luminescence Properties of Doped A Patra Jose, USA on September 16-20, 2007 Nanostructures. Forth International Meeting on Doped – nanomaterials and their A Patra Nanostruc-tured Materials and photoluminescence study Nanotechnology, Monterrey, Mexico, November 12-14, 2007 Centro De Investigaci-ones En Optica, Understanding the Photolumine-scence A Patra Leon, Mexico, November 23, 2007 Properties of Nano-Materials for Photonic Applications Recent Trends in Molecular Research Resonance energy transfer from dye to A Patra under the India-Japan Cooperative nanoparticles : A new spectrosco-pic Programme (IJCSP) at Kovalam, ruler Trivandrum, January 19-22, 2008 Future Directions of Advanced Steady-state and time resolved A Patra Materials Research (FDAMR) at spectroscopic study of nanoparticles Shimla, April 16-19, 2008 and their energy transfer City University of Beijing, China One dimensional organic semicon- S K Saha ductors for Photovoltaic application 3rd Indo-Japan Conference on Ferroics Achieving Multiferroicity: a search for S Ray and Multiferroics unconventional routes

Solid State Physics

American Ceramic Society 2007 Glass Relaxation dynamics in superionic A Ghosh and Optical Materials Division Meeting glasses and nanocomposites and 18th University Conference on Glass, Alfred University, Rochester, New York, USA, May 20 – 23, 2007 ICMAT-2007, New Routes to Nanomaterials as High-Density A J Pal Inorganic Materials, Films and Memory Elements Nanocrystals, Singapore 4th European Conference on Organic Electrical Bistability and Memory A J Pal Electronics and Related Phenomena, Phenomenon in Organic Varenna, Italy, October 1-4, 2007 Semiconductors Institute for Nanostructured Materials Organic Electronics: Electrical A J Pal – CNR, Bologna, Italy, October 5, 2007 Bistability, Memory Phenomenon and Molecular Rectification 122  IACS ANNUAL REPORT 2007-08

Istituto per lo Studio delle Rectification in Molecular and A J Pal Macromolecole del CNR di Milano Nanoscales (ISMAC), October 8, 2007 Politecnico di Milano, Milan, October Memory applications of semiconducting A J Pal 9, 2007 nanoparticles and organic molecules IUMRS - International Conference on Memory Phenomenon and Electrical A J Pal Advanced Materials, Bangalore, October Bistability in Organic Semiconductors 8-13, 2007 DST-JSPS joint conference on Recent Memory applications of molecular A J Pal Trends in Molecular Materials Research, materials Trivandrum, January 20 -22, 2008 Raja Ramanna Centre for Advanced Electrical Bistability and Memory A J Pal Technology, Indore, March, 17, 2008 Phenomenon in Organic Semiconductors ILL, Grenoble, France, May 30, 2007 Nano-clustered phase separation in the S Giri self doped manganites Katholieke Universiteit Leuven, Leuven, Magnetism of nanostructured oxides S Giri Belgium, June 1, 2007 University of Augsburg, Augsburg, Nanoscale phase separation in S Giri Germany, June 5, 2007 manganites: Glassy magnetic behavior and exchange bias One-day annual in-house symposium Exchange bias and nanoscale phase S Giri of Center for Advanced Materials, separation in cluster-glass compound

IACS, July 13, 2007 LaMn0.7Fe0.3O3 Internal Training, IACS, January 31, Nanomagnet: Future Prospect S Giri 2008 3rd Indo Japan Conference on Electronic structure of oxide based I Dasgupta Ferroics and Multiferroics, IACS & diluted magnetic semiconductor S N Bose Centre, Kolkata, February, 2008 Workshop and Conference on electronic Magnetism in low dimensional oxides: I Dasgupta structure theory: Methods and A perspective from first principles Applications, S N Bose Centre, Kolkata, calculations January, 2008 Symposium on Atomic, Molecular and Magnetism in low dimensional oxides: I Dasgupta Optical Sciences, Vedic Village, A perspective from first principles Kolkata, January, 2008 calculations Conference on Correlated Electrons First principles study of strongly I Dasgupta and Frustrated Magnetism, Goa, correlated systems December 2007 International Conference on Materials First Principles Electronic Structure of I Dasgupta for Advanced Technologies (ICMAT), Novel Oxides Singapore, July, 2007 IACS ANNUAL REPORT 2007-08  123

Spectroscopy

Chemistry Department, University of Spectroscopy of confined atomic P K Mukherjee Heidelberg, Germany systems Physics Department University of Spectroscopy of alkali atoms under P K Mukherjee Kassel, Germany liquid helium Workshop on Laser Spectroscopy and Spectroscopy of atoms under Nano P K Mukherjee Nano Photonics IIT Delhi confinements TPSC seminar at BHU, Varanasi 1.Spectroscopy of atoms under external P K Mukherjee plasma environments 2. Linear and non linear response properties of atomic systems under external fields Physics Department Nicolas Spectroscopy of atomic systems under P K Mukherjee Copernicus University, Torun, Poland liquid helium XXXIII symposium of OSI at Spectral line shifts of alkali atoms under P K Mukherjee Tezpur University liquid helium Workshop on Coherent control of Control of interference of K Rai Dastidar Optical Phenomena’ held at IIT- spontaneously generated oherence and Kanpur, July 9-10, 2007 dynamically induced coherence in a three level lambda system: Switching of non-linear response and group velocity Raman Research Institute, Bangalore, Slowing down of light in molecules by K Rai Dastidar October, 2007 invoking spontaneously generated coherence IIT, Kharagpur, September 17, 2007 Role of nuclear wavepackets in selective K Rai Dastidar vibrational excitation of molecules: Use of delayed phase-locked ultrashort pulses 35th International Conference in Photoinduced electron transfer and its T Ganguly Physical Chemistry, Xiamen University, applications Xiamen, China, September 25, 2007 Institute of Molecular Sciences, Recent trends in research on T Ganguly Academic Sinica, Taipei, Taiwan, nonradiative processes December 10, 2007 Institute of Molecular Sciences, Photophysical processes of excited T Ganguly Academic Sinica, Taipei, Taiwan, molecules December 24, 2007 Dept. of Chemistry (Under the auspices Laser flash photolysis investigations on T Ganguly of Eastern Royal of Chemistry, India charge separated products Section), February 27, 2008 9th Refresher course in hysics,Academic Electronic excited state and laser T Ganguly Staff College, Golapbag, Burdwan dynamics 124  IACS ANNUAL REPORT 2007-08

University, March 07, 2008 Conferenc on Recent Advances in Radiationless transitions Investigations T Ganguly Materials Science held In Ramananda by time resolved Spectroscopic method College, West Bengal, India held In Ramananda College, West Bengal, India Centre for Chemical Physics (CCP), Templating Effects and Optical B Mallik The University of Western Ontario Characterization of Copper (II) (UWO), London, Ontario N6A 3K7, Phthalocyanine Nanocrystallites Thin Canada, September 28, 2007 Film: Nanoparticles, Nanoflowers, Nanocabbages, Nanoribbons and Nanorods Research Institute for Electronic Semiconductor nanocrystallites: Some B Mallik Science, Hokkaido University, Sapporo, interesting properties Japan, March 25, 2008

Theoretical Physics

Seminar at University of Lethbridge, Miracles of extra dimensions S Sengupta

Canada, April, 2007 Lecture course at University of Supersymmetry and Supergravity S Sengupta Lethbridge, Canada, April, 2007 Seminar at B P Poddar Inst. of Singularities K Ray Management and Technology, April 30, 2007 Lecture at DAMTP, University of Modulus stabilization and hierarchy S Sengupta

Cambridge, U K, May, 2007 problem in warped braneworld models Seminar at IISc., Bangalore on June 20, Temperature Dependence of Critical S Biswas 2007 Number of Particles for Attracting Atomic Bose Gas Lecture at Helsinki Institute of Physics, Forbidden territories in the String K Ray June 22, 2007 Theory CNR-INFM, Research and Temperature Dependence of Critical S Biswas Development, Center on Bose-Einstein Number of Particles for Attracting Condensation, Phys. Dept., Univ. of Atomic Bose Gas Trento, Italy 14th Int. Symposium on (e,2e) DPI and Laser assisted collisions of charged C Sinha related Process, Konigstein, Germany, particles with atoms and positronium August 1 – 4, 2007 Young Physicist Conf., SINP, Kolkata, Ground State Energy of a Particle N Bera August 22 –23, 2007 Confined in a Super Circular Box Cent. for Atomic, Molecular and How Circular a Circular Quantum N Bera Optical Sciences, IACS, August 31, Dot is ? IACS ANNUAL REPORT 2007-08  125

2007 Inst. of Phys., Bhubaneswar, From amoebas to trees and forests – K Ray September 2 –5, 2007 tropical varieties Conf. on History of Science, SINP, Role of the Indian Journal of Physics J K Bhattacharjee Kolkata, October 4 –5, 2007 Photonics workshop at IIT-Kharagpur, The History of Photon J K Bhattacharjee October 11–12, 2007 M P I Dresden, Germany, November The Ubiquitous Hydraulic Jump J K Bhattacharjee 16, 2007 University of Goettingen, November Patterns in Reaction Diffusion Systems J K Bhattacharjee 30, 2007 Platinum jubilee conf. on Theoretical Hydraulic Jump J K Bhattacharjee Physics, ISI, Kolkata, December 7, 07 6th meeting of the Field Theoretic Gravity and warped geometry – some S Sengupta

Aspects of Gravity (FTAG-VI), HRI, key issues Allahabad, November 13 –18, 2007 Workshop on From Strings to LHC-II Cosmological Constant, brane tension S Sengupta at Bangalore, December 19 –23,07 and large hierarchy in a generalised Randall- Sundrum Scenario Workshop on Physics of warped extra Review of warped braneworld models S Sengupta dimensions, IIT-Kharagpur, February 21 -23, 2008 One Day State Level (U.G.C.) Seminar Mysteries of Space, Time – A S Sengupta on Understanding The Fundamentals Relativistic World of Physical and Chemical Sciences, Dum Dum Motijheel College, Kolkata, March 28,2008 Higgs Hunters Meeting 2008, Search for Higgs Bosons in SUSY S Roy (Organised by Visva-Bharati and Cascades with Non-universal RECAPP, HRI, Allahabad), Visva- Gaugino masses Bharati, Santiniketan, February 7 -8, 2008 Workshop on Physics of warped extra Constraining the RS modulus in the S Roy dimensions, IIT-Kharagpur, February light of recent PVLAS data 21 -23, 2008 Workshop on High Energy Physics Implications of non-universal gaugino S Roy and Cosmology (HEPCOS-2008), masses on the dark matter and Higgs Center for Theo. Phys., Jamia Islamia searches Univ., New Delhi, March 11 -12, 2008 SERC Preparatory School in Particle Physics and Standard Model S Roy 126  IACS ANNUAL REPORT 2007-08

Theoretical High Energy, Dept. of Phys., BHU, Benaras, December 3 –15, 2007 Workshop on Quantum Correlation Quantum transport in Superconductor S S Mandal and Quantum Computing (QCQC07) heterjunctions at IIT-Kharagpur, December 11 –13, 2007 Workshop on Recent Trends in Fractional Quantum Hall Effect S S Mandal Condensed Matter, SINP, Kolkata, March 7 – 8, 2008 Indo-French Conf. on RNAi in RNAi in Genome control Z Ghosh Genome Control, Cent. For Cellular & Molecular Biology, Hyderabad, December 12 –14, 2007 Higgs Hunters Meeting 2008, Extending the Higgs funnel region of D Das (Organised by Visva-Bharati and SUSY dark matter relic density via RECAPP, HRI, Allahabad), Visva- non-universal scalar masses Bharati, Santiniketan, February 7 - 8, 2008 Workshop on Physics of warped extra Localization of Fields in Braneworld R Koley dimensions, IIT-Kharagpur, February 21 -23, 2008 String Group Meeting, Org. by Dept. Superstring Partition Functions in the S Paulchowdhury of Theo. Phys. of SINP and IACS, Doubled Formalism March 4 - 5, 2008 1st State Level Seminar on Recent Collision at nanokelvin temperature S Chakraborty Advances in Material Science, and formation of stable BEC Bishnupur, Bankura, West Bengal, India, March 27-28, 2008

Biological Chemistry

Invited Lecture at Torrey Pines of Understanding the Biochemical M Ray Institute for Molecular Studies Differences between Normal and (TPIMS), USA, September, 2007 Malignant Cells: Designing of an Anticancer Drug Invited Lecture at John Hopkins Evaluation of a cancer controlling agent M Ray University, Baltimore, USA, September, for non toxic target specific 2007 chemotherapy Indian Science Congress, Andhra Chaired a Session M Ray University, January 3 -7, 2008 Invitated talk in National Level Seminar Understanding Cancer and Designing M Ray organised by the Department of a Non-Toxic Drug Chemistry of Ramakrisna Mission Vidyamandira, Belur, Math 14, 2008 Indian Institute of Chemical Amphiphilic,Antibacterial Soft Matters P K Das IACS ANNUAL REPORT 2007-08  127

Technology, Hyderabad, January 01, for Biomedicinal Applications 2008 International Conference on Soft Amino Acid Based Amphiphilic P K Das Systems, Center for Surface Science, Hydrogelators: Potent for Biomedicinal Department of Chemistry, Jadavpur Applications University, Kolkata, February 13-15, 2008

Inorganic Chemistry

Seminar in Department of Chemistry, Selective fluorescence zinc ion sensing P Banerjee Rani Durgavati University, Jabalpur, and binding behavior of 4-methyl-2, MP, August 2007 6-bis (((phenylmethyl)-imino) methyl) phenol : biological application Refresher course in Chemistry, Jadavpur Selective fluorescence zinc sensors of P Banerjee University, January 2 -22, 2008 varied types Refresher Course, Jadavpur University, Ligand design in coordination S Goswami January 19, 2008 chemistry : Approaches to synthesis of new material, catalyst and ð-radical ligands Ramakrishna Mission Vidyamandira, Supramolecular Chemistry : Basics to P Ghosh Belur Math, Howrah, Delivered, Chemical Sensors November 17, 2007 12th MTIC, Department of Chemistry, Regioselective ortho-fusion of primary S Samanta

Indian Institute of Technology, aromatic amines by OsO4. Isolation of Chennai, December 6-8, 2007 oxo-amido osmium(VI) complexes and their catalytic activities 12th MTIC, Department of Chemistry, A combined experimental and density S Chatterjee Indian Institute of Technology, Chennai functional theoretical approach towards December 6-8, 2007 understanding of electophilic substitution reactions in Ruthenium acetylacetonates 12th MTIC, Department of Chemistry, Targeted synthesis of mu-oxo P B Banerjee Indian Institute of Technology, Chennai divanadium(V) compounds with December 6-8 , 2007 asymmetry in coordination environments 11th CRSI, Indian Institute of Science, Mild Synthesis of a family of planar M Sinan Bangalore, February 2 – 4, 2008 triazinium cations via proton catalyzed cyclization of pyridyl containing diazo compounds and studies on DNA intercalation

Organic Chemistry

Two lectures in the DST sponsored Green Reactions Avoiding Hazardous B C Ranu National Workshop on Green Organic Solvents and Toxic Catalysts – Chemistry Practices and Their Part I and II 128  IACS ANNUAL REPORT 2007-08

Applications organized by Cotton College, Guwahati, April 1-4, 2007 KVPY programme at IACS, Kolkata, Green Chemistry – the Key to Our B C Ranu May 16, 2007 Good Living DST sponsored workshop on Green Green Chemistry in Teaching and B C Ranu Chemistry at NIPER, Mohali, Research September 3-4, 2007 Lady Broubourne College, Kolkata in a Green Chemistry – Its Relevance in B C Ranu seminar jointly sponsored with CRSI, Environment and Education September 7, 2007 Dinard, France in 4th Annual Palladium and Copper Nanoparticles B C Ranu Symposium of Indo-French Center in as Catalysts in Carbon-Carbon and Organic Synthesis, September 12-14, Carbon-Heteroatom Bond Formation 2007 2nd International Symposium on Potential of Metal Nanoparticles in B C Ranu Atomic Technolgy (ISAT-2) at Awaji, Organic Reactions Japan, October 1-2, 2007 Department of Chemistry, Osaka Ionic Liquid – A powerful Tool in B C Ranu University, Japan, October 03, 2007 Organic Synthesis Department of Chemistry, Tokyo Potntial of Metal Nanoparticles in B C Ranu University of Science, Japan, October Organic Reactions 05, 2007 Department of Chemistry, University Metal Nanoparticles as Efficient B C Ranu of California, Santa Barbara, USA, Catalysts for Organic Reactions October 12, 2007 Benaras Hindu University, Varanasi, Green Chemistry – Society and B C Ranu November 15, 2007 Environment Popular lecture at IACS organized by Green Chemistry to Protect B C Ranu Science Association Club, December Environment and Humanity 26, 2007 Plenary lecture in Indo-US S & T Metal Nanoparticle as Green Catalyst B C Ranu Forum workshop on Green Chemistry for Organic Reactions at Delhi, January 7-9, 2008 Key note address in the National Metal Nanoparticle in Organic B C Ranu Seminar on Recent Trends in Chemical Synthesis Sciences, Sambalpur University, February 9-11, 2008 DST sponsored workshop on Green Practice of Green Chemistry in B C Ranu Chemistry at Pondicherry University, Research and Teaching March 7-8, 2008 National Symposium on Modern Metal Nanoparticles in Organic B C Ranu Trends in Chemistry: Molecules to Synthesis IACS ANNUAL REPORT 2007-08  129

Materials, at Jawaharlal Nehru University, Delhi, March 14-15, 2008 Key note lecture in the UGC Sponsored Practice of Green Chemistry in B C Ranu National Seminar cum Workshop on Teaching and Research Green Chemistry: Its Implications in UG Curriculam and in Industry at New Alipore College, Kolkata, March 27-28, 2008 Department of Chemistry, Green Chemistry in Research and B C Ranu Viswabharati University, Santiniketan, Teaching March 29, 2008 National Chemical Laboratory, Pune, Synthesis of Plant self-sustenance R V Venkateswaran April 21, 2007 agents - Heliannuols from cultivar sunflowers Department of Chemistry, Western Synthesis of allelopathic natural R V Venkateswaran Michigan University, Kalamazoo, products - heliannuols MI, USA, July 02, 2007 Deparment of Horticulture, Michigan Synthesis of allelopathic natural R V Venkateswaran State University, East Lansing, MI, products - heliannuols USA, July 12, 2007 M.D. Anderson Cancer Center, Synthesis of allelopathic natural R V Venkateswaran University of Texas, Houston, TX, products - heliannuols USA, July 16, 2007 Arena Pharmaceuticals, San Diego, Synthesis of allelopathic natural R V Venkateswaran CA, USA, July 20, 2007 products - heliannuols Department of Chemistry, University Synthesis of allelopathic natural R V Venkateswaran of California, Los Angeles, CA, USA, products - heliannuols July 24, 2007 Pailan College of Management Management – A Scientist’s Perspective R V Venkateswaran Technology, Pailan Park, Joka, Kolkata, January 18, 2008 12th NOST Conference at Majorda Rapid access to densely functionalized S Ghosh Beach Resort, Goa, July 7-10, 2007 bridged and condensed ring systems through a domino process involving ring opening-ring closing metathesis Symposium on Natural Products: Past, Rapid access to densely functionalized S Ghosh Present and Future, Organised by bridged and condensed ring systems Prof. R. N. Chakravarti 90th Birth through a domino process involving Anniversary Celebration Committee ring opening-ring closing metathesis and West Bengal Academy of Science and Technology, Central Glass and Ceramic Research Institute, Kolkata, August 3, 2007 44th Annual Convention of Chemists, Domino metathesis involving ROM- S Ghosh 130  IACS ANNUAL REPORT 2007-08

Mahatma Gandhi Institute of Applied RCM Rapid access to bridged, Sciences, Jaipur, December 23-27, 2007 condensed and angularly fused ring systems present in a number of bioactive natural products National Seminar on Current trends in Sequencing Olefin metathesis S Ghosh Chemistry-II, University of Kalyani, Expedient approach to complex West Bengal, March 04, 2008 molecular architecture with potent medicinally important natural products A Course of 8 Lectures, NIPER, Logics in Organic Synthesis S Ghosh Kolkata, February-March, 2007 Recent Trends in Organic Chemistry, Ketyl Radical Promoted S Lahiri Centre of Advanced Studies, Calcutta Transformations Under PET University, March 28, 2008 Conditions A Course of 15 Lectures, Department Pericyclic Reactions S Lahiri of Chemistry, Vidyasagar University, March, 2008 A Course of 10 Lectures, B. E. College, Organic Photochemistry S Lahiri Shibpur, July-Aug, 2007 A Course of 6 Lectures, NIPER, Ultraviolate and Visible Spectroscopy S Lahiri Kolkata, November, 2007 Medal Lecture in 10th CRSI National Titanocene(III)-Mediated Radicals in S C Roy Symposium in Chemistry, Indian Organic Synthesis Institute of Science, Bangalore, February 1-3, 2008 National Symposium on Recent Titanocene(III)-Mediated Radicals in S C Roy Advances in Natural Products Natural Products Synthesis Chemistry, Department of Chemistry, Gauhati University, Guwahati, February 22-23, 2008 Brain Storming meeting arranged by Photochemical regulation of ntl-gene S Sinha Department of Science and Technology (DST), New Delhi at Indian Institute of Technology, Madras, November 16, 2007 S. N. Bose National Center for Basic Conditional regulation of hedgehog S Sinha Sciences (SNBNCBS), Kolkata, India, (Hh) signaling pathway December 8, 2007 Astra Zeneca, Bangalore, India, July 23, Small molecule modulation of S Sinha 2007 hedgehog (Hh) siganling pathway

Physical Chemistry

JNC Frontier Lecture at GNDU, Femtosecond dynamics in Organized K Bhattacharyya Amritsar October 24-26, 2007 Assemblies IACS ANNUAL REPORT 2007-08  131

Indo-German Meeting, IIT Kanpur Ultrafast Processes in Organized & K Bhattacharyya October 26-28, 2007 biological Assemblies Internat. Symp. Recent Trends in Surf. Study of Organized & biological K Bhattacharyya & Colloids, ISI, November, 2007 Assemblies using ultrfast laser IISER, Mohali, February 27-28, 2008 Femtosecond Dynamics K Bhattacharyya AIST, Tsukuba, Japan, March, 2008 Femtosecond dynamics in Organized K Bhattacharyya Assemblies RIKEN, Japan, March, 2008 Study of Ultrafast Processes in K Bhattacharyya Organized and Biological Assemblies Tokyo Inst of Tech, Japan, March, Ultrafast Processes in Organized and K Bhattacharyya 2007 Biological Assemblies Calcutta University, Refresher Course, a) Infrared Spectroscopy & b) Time- T Chakraborty November 22-23, 2007 resolved IR spectroscopy Trombay Symposium on Radiation & Infrared Spectroscopy probing of T Chakraborty Photophysics, January, 2008 C-H…O hydrogen bonds CRSI Mid year meeting, IIT Guwahati, Electronic Spectroscopy of doubly T Chakraborty July, 2007 hydrogen bonded dimers Discussion meeting on spectroscopy Myth of methyl rotor effect on T Chakraborty and dynamics of molecules and clusters, vibrational dynamics of molecules and Mohabalipuram, February, 2008 clusters Modern trends in chemistry: From Role of methyl rotor in vibrational T Chakraborty Molecules to Materials, School of dynamics of molecules and clusters Physical Sciences, JNU, Delhi, March 14-15, 2008 Seminar on Agro-based organization …, Pattern Formation D S Ray Bose Institute, August 7, 2007 Workshop on Concepts in Chemistry I, Excitements in nonlinear dynamics in D S Ray Ramananda College, Bankura, Chemistry (4 lectures) September 28 -29, 2007 Refresher Course in Chemistry, Measurement of equilibrium properties D S Ray Department of Chemistry, Calcutta from nonequilibrium measurements University, December 5, 2007 Refresher Course in Chemistry, Electron transfer reactions D S Ray Department of Chemistry, Jadavpur University, June 17, 2008 Workshop on Concepts in Chemistry Thermodynamics (3 lectures) D S Ray II, Berhampur K N College, Murshidabad, February 1 - 3, 2008 Invited Lecture, Department of Jarzynski Relation D S Ray Chemistry, Visva-Bharati, Santiniketan, March 6, 2008 132  IACS ANNUAL REPORT 2007-08

Post BSc Integrated PhD Program, Nonequilibrium Statistical Mechanics D S Ray IACS, 2007 & Thermodynamics (30 lectures) Calcuuta University, PG II (Physical Reaction dynamics and Nonequilibrium D S Ray Chemistry Special), September, 2007 – Statistical mechanics (15 lectures) March, 2008 Scottish Church College PG II Chemical kinetics, Recation dynamics D S Ray (Physical Chemistry Special), and nonequilibrium Statistical September, 2007 – March, 2008 Mechanics (30 lectures) International Conference on Neural Genetic Algorithm and Computation S P Bhattacharyya network and Genetic Algorithm in of Electronic Structure: Search for Materials Science (NGMS08), Taj Alternative Strategies Bengal, Kolkata, January, 2008 Post BSc Integrated PhD Programme I. Group Theory (30 Lectures) S P Bhattacharyya in Chemistry II. Advanced Quantum Mechanics (10 Lectures) Indo-Swedish Workshop, IACS, Genetic Algorithms in Electronic S P Bhattacharyya Kolkata Structure Calculations Refresher Course in Chemistry, Chemical Binding I: Energetics S P Bhattacharyya Calcutta University, Academic Staff Chemical Binding II: Dynamics College University of Debrecen, Hungary Beyond Born - Oppenheimer Treatment S Adhikari Fritz Haber Institute, Jerusalem The Curl equation for non-adiabatic S Adhikari coupling elements Minerva Gentner Symposium: Time A Quantum-Classical Approach to the S Adhikari Dependent Density Functional theory, Photoabsorption spectrum of Pyrazine Eilat, Israel, December 16 -21, 2007 Discussion meeting on spectroscopy Quantum-Classical Approach to the S Adhikari and dynamics of molecules and clusters, Photoabsorption spectrum of Mohabalipuram, February, 2008 Butatriene Cation Fifth CRSI meeting, (Kolkata Chapter), Beyond Born - Oppenheimer Treatment S Adhikari Jadavpur University, 2007 Dept. of Chemistry, IIT Bombay, 2007 A Quantum-Classical Approach to the S Adhikari Photoabsorption spectrum Post BSc Integrated Ph. D. Program, a) Chemical Dynamics (40 lectures) S Adhikari IACS b) Advance Quantum Dynamics (20 lectures) CKM Memorial Summer Workshop Rectification of noise (2 lectures) D S Ray on Expt. Phys 2006 – IPTA, IACS, July, 2006 Rahara V C College under CRSI Chemical reactions from equilibrium D S Ray Programme, August, 2006 Post BSc Integrated PhD Programme Irreversible Thermodynamics D S Ray IACS ANNUAL REPORT 2007-08  133 in Chemical Sciences, IACS, 1st (15 lectures) Semester, October-November, 2006 Post BSc Integrated PhD Programme Chemical Dynamics (25 lectures) D S Ray in Chemical Sciences, IACS, 3rd Semester, August-November, 2006 Post BSc Integrated PhD Programme Nonequibrium Statistical Mechanics D S Ray in Chemical Sciences, IACS, 3rd (12 lectures) Semester, August-November, 2006 Calcutta University, PG-II (Physical Nonequibrium Statistical Mechanics D S Ray Chemistry Special), September, 2006 and Reaction Dynamics (14 lectures) and February, 2007 Trends in Chemistrt, Bethune College, Rate of Chemical Reactions (1 lecture) D S Ray November, 2006 SERC School on Nonlinear Dynamics Spatio-temporal organization D S Ray at IACS, December, 2006 (4 lectures) International Conference on Structure Noise-induced pattern formation D S Ray and Dynamics, Centenary Celebration, (1 lecture) Calcutta University, December, 2006 Refresher course in Chemistry, Jadavpur Entropy and Evolution D S Ray University, June, 2007 International Workshop on Neural Networks and Genetic Algorithm, BE College, January, 2006 From Aryabhatta to Harishchandra, Physical Chemistry in the last century; D S Ray Vivekananda University, February, 2007 An Indian Perspective

Polymer Science Unit

Colloquium on Perspectives of Polymer Nanocomposites of carbon nanotube A K Nandi Science & Technology organized by and electroactive polymers SPSI, IACS, Kolkata Chapter International Conference of Advanced Nanocomposites of MWNT with A K Nandi Materials organized by IUMRS- electroactive polymers ICAM-2007, Bangalore G. E., Bangalore Poly(3-alkyl thiophene) – A K Nandi nanocomposites Centre de Research Sur des Nanostructured self assembly of poly A K Nandi Macromolecules Vegetables at (o-methoxy aniline) and DNA Grenoble, France Dept. of Chemical Engineering, Poly(3-hexyl thiophene) – clay A K Nandi University of Louis Pasteur, Strasbourg, nanocomposites France Institut Charles Sadron, Strasbourg, Nanostructured self assembly of poly A K Nandi France (o-methyl aniline) & DNA 134  IACS ANNUAL REPORT 2007-08

Raman Center for Atomic Molecular and optical Sciences

Workshop on Nuclei and Mesoscopic Applications of a Novel Spin-free D Mukherjee Physics, Michigan State University, Combinatoric Open-shell Coupled 2007 Cluster (COS-CC) Theory to Single- reference Doublets Symposium in honor of Professor State-specific multireference coupled D Mukherjee Wilfried Myeres, University of cluster theory and its CEPA Kaiserslautern approximants Keynote Address: Symposium on Some Recent advances in State-Specific D Mukherjee Advanced Methods of Quantum Multi-Reference Coupled Cluster Chemistry and Physics (SAMQCP), Theories and its Approximate Variants Torun, Poland

International Conference of Applications of a Novel Spin-free D Mukherjee Computational Methods in Sciences Combinatoric Open-shell Coupled and Engineering 2007 (ICCMSE Cluster (COS-CC) Theory to Single- 2007), Corfu, Greece reference Doublets

Plenary Lecture: 47th Sanibel A Novel Cluster Expansion Formalism D Mukherjee Symposium, St Simons Island, Georgia, for Treating Strong Relaxation and 2007 Correlation Effects in Open-shell Systems

International Conference honoring Recent advances in state-specific multi- D Mukherjee Professor Peter Pulay, Budapest, reference coupled cluster formalism Hungary, 2007

16th Canadian Symposium on State-specific multireference coupled D Mukherjee Theoretical Chemistry (CSTC2007), cluster theory and its CEPA St. John’s Island, Canada approximants

Physics & Meteorology Department, Quantum computation – an M Mukherjee IIT, Kharagpur experimental approach

Physics & Meteorology Department, A single ion as a two photon source M Mukherjee IIT, Kharagpur

Quantum Information Science - Quantum teleportation – a reality M Mukherjee workshop

Centre for Advanced Materials

Annual Conference at Dinabandhu Unusual features in magneto resistance D D Sarma Andrews College, Kolkata of double peroxite oxide

ICMM-2007, SINP, Kolkata A new type of magnetotransport in D D Sarma

Sr2FeMoO6 MRSI Short Course Program on Synchroton-based microscopic D D Sarma Microscopy and Diffraction- investigations of the phase separation ATMC-07, MRSI, Kolkata Chapter problem IACS ANNUAL REPORT 2007-08  135

TWAS GBM at Trieste as the TWAS “Sr2FeMoO6 – a fascinating compound D D Sarma Prize (Physics)

Correlated Electron and Frustrated Sr2FeMoO6 and related compounds”. D D Sarma Magentism at Goa (CEFM07)

Inaugural session Indo- Australia Time-resolved experiments to D D Sarma symposium investigate the growth of semiconducting nanocrystals in solution: Many surprises

Bangalore Nano 1. A brief history of EU-India D D Sarma collaboration in Computational Materials Science leading to the Coordinated Call for Proposals 2. What is so special about nanoparticles - optical properties

ICMM2007 at SINP A new type of magnetotransport D D Sarma

in Sr2FeMoO6 Indo-Sweden conference IACS, Magnetic and Electronic Structures of D D Sarma Kolkata Diluted Magnetic Semiconductors” Off board Scientifique Programme Excitement with nano science and D D Sarma With Science Express, IACS,Kolkata Nanotechnology

Special session on Spintronics during Oxide materials for spintronics D D Sarma TeckKriti, IIT, Kanpur Non-equilibrium phenomena in Growth of semiconducting nanocrystals D D Sarma condensed matter, INSA, New Delhi in solution International Conference on Doping transition metal ions in to D D Sarma Nanoscience and Technology, semiconducting nanocrystals (ICONSAT) 2008 India-Japan Workshop on Quantum 1. Introduction to Electron D D Sarma Beam Science Programme, SINP, spectroscopy Kolkata 2. Phase separation probed by spatially resolved PES 136  IACS ANNUAL REPORT 2007-08

(v) Visits at various places as per table below:

(a) Within the Country

Purpose / place of Visits Activity / Role Name of the Faculty /Staff Fellow

Materials Science

Institute of Physics, Bhubaneswar, Colloquium speaker & B N Dev May 21, 2007 Collaboration 18th International Conference on Ion Beam Co-Chairman, Co-Editor of the B N Dev Analysis (IBA 2007), Hyderabad, September Conference Proceedings in an 23-28, 2007 Elsevier Science journal International Conference on Advanced Invited speaker & Member of B N Dev Materials, IUMRS-ICAM2007, Bangalore, the organizing committee October 8 -13, 2007 Viswa Bharati University, Shantiniketan, Colloquium speaker B N Dev December 14, 2007 Conference on Electronic Structure: Theory Session Chairman B N Dev and Applications, IACS &SNBNCBS, Kolkata, January17-18, 2008 4th National Workshop on Characterization Invited speaker & Chief Guest B N Dev of Laser and Nanomaterials, Burdwan University, March 7-9, 2008 International Symposium on Atomic, Chaired a Session G P Das Molecular and Optical Sciences & High Performance Computing: A Seamliess Frontier, Vedic Village, Kolkata, January, 2008 Indian Leather Technology Association Chief Guest G P Das 37th National Seminar on Crystallography, Participant as a member of local T Kar Jadavpur University, 2008 organizing committee 37th National Seminar on Crystallography, Poster Presentation Sweta Maitra Jadavpur University, 2008 Saikat Seth Tapati Mallik

Spectroscopy

XXXIII symposium of OSI at Tezpur Invited talk P K Mukherjee University during December 18 -20, 2007 Workshop on Laser Spectroscopy and Nano Invited talk P K Mukherjee Photonics at IIT Delhi during March IACS ANNUAL REPORT 2007-08  137

14 -15, 2008 Dept. of Chemistry, North Bengal Special invited talk T Ganguly University, India under the auspices of Eastern India section of Royal Society of Chemistry, February 27, 2008

9th Refresher course in Physics Invited talk as a resource person T Ganguly Academic Staff College, Golapbag, Burdwan University, March 07, 2008

Workshop on on Interdisciplinary Invited Talk T Ganguly approach related to the 100 years of Science departments of Vidyasagar College, Kolkata, March 18, 2008

Recent Advances in Materials Science, Invited Talk & Chairperson T Ganguly Ramananda College, West Bengal, India, March 27-28, 2008

Langmuir – Blodgett Technique, a Unique Invited talk G B Talapatra Thin Film Technology at the Govt. College of Engg. & Ceramic Technology, Govt. of WB, Kolkata at the National Workshop on Ceramics and Special Coatings, April 11-12, 2008

IIT, Kharagpur, September 17, 2007 Invited Talk K Rai Dastidar

Raman Research Institute, Bangalore, Invited Talk K Rai Dastidar October, 2007

Workshop on Coherent control of Optical Invited Talk K Rai Dastidar Phenomena’ held at IIT- Kanpur, July 9 - 10, 2007

Topical Conference on Atomic and Invited Talk A K Das Molecular Physics, Sardar Patel University, Gujarat, January 3 – 5, 2008

Research Institute for Electronic Science, Invited Talk B Mallik Hokkaido University, Sapporo, Japan, March 25, 2008

The effect of salts on alcohol dehydrogenease Poster presentation T Kamilya Langmuir-Blodgett film” 10th CRSI National Symposium in Chemistry, NSC-10, IISc, Bangalore, INDIA. February 1-3, 2008

Relative study of immobilization of Poster presentation T Kamilya Ovalbumin in different DPPC matrices”, International Conference on Soft Systems (ICSS-2008) Centre for Surface Science, 138  IACS ANNUAL REPORT 2007-08

Dept. of Chemistry, Jadavpur University, Kolkata, February 13-15, 2008

Amyloid-fibrillation of Yeast alcohol Poster presentation T Kamilya dehydrogenease at air/water interface studied by Langmuir Blodgett technique, International Conference on Nano Science & Technology, (ICONSAT 2008), Chennai, February 27-29, 2008 DAE-BRNS Basic Sciences School on Participation T Kamilya Condensed Matter Interface with Chemistry and Biology at BARC, Mumbai, March 3-14, 2008 DAE-BRNS Basic Sciences School on Lecture Presentation T Kamilya Condensed Matter Interface with Chemistry and Biology at BARC, Mumbai, On the formation of protein-lipid thin film with minimum aggregation of protein, March 13, 2008 Workshop on High performance Computing, Participation M Gupta IACS, Kolkata, India, April 23 -26, 2007 International Symposium on atomic, Poster Presentation M Gupta molecular and optical sciences & high performance computing: A seamless frontier, Vedic Village, Kolkata, January 10-12 2008 Topical Conference on Atomic and Poster Presentation M Gupta Molecular Physics, Sardar Patel University, Gujarat, January 3 - 5, 2008 Topical Conference on Atomic and Poster Presentation N C Bera Molecular Physics, Sardar Patel University, I Bhattacharya Gujarat, January 3 – 5, 2008

Theoretical Physics

Inst. Of Physics, Bhubaneswar, July 3 –16, Visited S Paulchowdhury 2007 HRI, Allahabad, August 27 –31, 2007 Visited S Sengupta Raman Research Institute, Bangalore, Visited S Biswas September 1 - October 1, 2007 Theo. Phys. Dept. , TIFR, Mumbai, Visited P Majumdar December 3 –7, 2007

Biological Chemistry

Collaboration/ Delhi University, New Delhi Research/ Collaborator S S Jana

Inorganic Chemistry IACS ANNUAL REPORT 2007-08  139

Chennai Chaired a Session P Banerjee Jabalpur Invited Talk P Banerjee Jadavpur Deliver a Talk P Banerjee Jadavpur Invited Lecture S Goswami Jaipur Deliver a Talk P Ghosh Chennai Deliver a Talk P Ghosh Jadavpur Participated R Mondal Chennai Poster Presentation S Samanta Chennai Poster Presentation S Chatterjee Bangalore Poster Presentation M Sinan Chennai Poster presentation P Lakshminarayanan Visakapatnam Presentation for ISCA Young P Lakshminarayanan Scientist Chennai Poster presentation M Arunachalam Bangalore Poster presentation I Ravikumar

Polymer Science Unit

International Conference of Advanced Invited lecture A K Nandi Materials, IUMRS-ICAM-2007, Bangalore General Electric Co., Bangalore Invited lecturer A K Nandi

Computer Centre

Young Physicists Colloquium (YPC)–2007, Member, Organizing Committee S Deoghuria Organised by Indian Physical Societ,at Saha Institute of Nuclear Physics, August 23-24, 2007 140  IACS ANNUAL REPORT 2007-08

Undergraduate physics Teaching, Organised Member, Organizing Committee S Deoghuria by Indian Physical Society at Behala College, Kolkata, February 8-10, 2008

(b) Abroad :

Purpose / place of Visits Activity / Role Name of the Faculty/Staff / Fellow

Materials Science

Hamburg Synchrotron Radiation Laboratory Synchrotron radiation experiment B N Dev (HASYLAB at DESY), Hamburg, Germany, September 10-16, 2007 Institute of Ion Beam Physics and Collaboration B N Dev Materials Research, Research Centre Dresden-Rossendorf, Dresden, Germany, November 1-4, 2007 National University of Singapore Colloquium speaker & G P Das Collaborative Research National University of Singapore Colloquium speaker & Saswata Bhattacharya Collaborative Research Teschnische Universitaet Cluasthal Colloquium speaker & G P Das Collaborative Research Max Planck Institut FKF, Stuttgart Colloquium speaker & G P Das Collaborative Research Italy; For performing Synchrotron Experiments at the beamline S Ray Experiments in Elettra Collaboration/Oklahama State University, Research done on Quantum B Deb January - February, 2008 entaglement of two Bose condensates National Chen Kung University, Taiwan Visiting Professor S K Saha

Solid State Physics

Collaborative work Department of Applied Visiting Professor B K Chaudhuri Electronics, Tokyo University of Science, Noda, Chiba, Japan Collaborative work Department of Physics, Visiting Professor B K Chaudhuri National Sun Yat Sen University, Taiwan Joint project Between CSIR, India and Academic Visitor S Sarkar Royal Society, UK University of Sheffield, UK

Spectroscopy IACS ANNUAL REPORT 2007-08  141

Ovalbumin and octadecylamine interaction Poster Presentation G B Talapatra studied by Langmuir Blodgett technique”, 12th International Conference on organized molecular films (LB-12) Jagiellonian University, Kraków, Poland, July 1-5, 2007 Symposium on Advanced Methods of Poster Presentation N C Bera Quantum Chemistry and Physics (SAMQCP 2007) at Institute of Physics, Faculty of chemistry, Nicolaus Copernicus University, Torun, Poland, September 2-6, 2007 Formation of a pepsin monolayer at air/water Poster Presentation P Pal interface by Langmuir Blodgett technique”, 12th International Conference on organized molecular films (LB-12) Jagiellonian University, Kraków, Poland, July 1-5, 2007 Formation of a protein-lipid film by Poster Presentation T Kamilya combined techniques of Langmuir Blodgett and Self Assembly methods, 12th International Conference on organized molecular films (LB-12) Jagiellonian University, Kraków, Poland, July 1-5, 2007

Theoretical Physics

University of Lethbridge, Canada, April, Visited S Sengupta 2007 DAMTP, Cambridge, U K, May, 2007 Visited S Sengupta Ins. Of Atomic and Molecular Science, Visiting Scholar S Chakraborty Academia Sinica,Taipei, Taiwan, April 1–May 31, 2007 Ins. Of Atomic and Molecular Science, Post Doctoral Fellow S Chakraborty Academia Sinica, Taipei, Taiwan, September 1– November 12, 2007 Helsinki Institute of Physics, Finland, June Visited K Ray 18 – 22, 2007 CERN, Geneva, Switzerland, July 2 – 16, Visited K Ray 2007 Univ. of Gottingen, Germany, November Visited J K Bhattcharjee 14 – December 3, 2007 Helsinki Inst. of Physics, Finland, November Visited S Roy 14 – December 1, 2007

Energy Research Unit

ISI-PV, Juelich, Germany, September Invited Talk S Ray 142  IACS ANNUAL REPORT 2007-08

12 - 15, 2007 Hahn-Meitner-Institute, Berlin, September Invited Talk S Ray 16 - 18, 2007 22nd European Photovoltaic Solar Energy Oral presentation S Ray Conference, Milan, September 3 -7, 2007 17th International PVSEC at Fukuoka, Papers presented S Ray Japan, December 3 -7, 2007 Laboratoire de Physique des Interfaces et Collaborative work P Chatterjee des Couches Minces, Ecole Polytechnique, Palaiseau, France, June - September, 2007 22nd International Conference on Amorphous Oral presentation P Chatterjee and Nano-crystalline Semiconductors (ICANS-22), Breckenridge, USA, August 19 -24, 2007 22nd International Conference on Amorphous Oral Paper presentation P Chaudhuri and Nanocrystalline Semiconductors (22 ICANS), August 19 -24, 2007, Breckenridge, USA Visiting Collaborator’s lab in France, August Collaborative research work P Chaudhuri 27 - September 10, 2007 17th Photovoltaic Science and Engineering Paper presentation P Chaudhuri Conference (17th PVSEC), Fukuoka, Japan, December 3 – 7, 2007 22nd International Conference on Amorphous Paper presentation P Chaudhuri and Nanocrystalline Semiconductors (22 ICANS), Breckenridge, USA, August 19 - 24, 2007 17th Photovoltaic Science and Engineering Paper presentation P Chaudhuri Conference (17th PVSEC), Fukuoka, Japan, December 3 – 7, 2007 Solar energy Centre, Gurgaon, Haryana, Attended the meetings P Chaudhuri June 26 - 27 and July 18, 2007

Inorganic Chemistry

Boston, USA Invited Speaker P Ghosh

Organic Chemistry

Indo-French Collaborative Programme, Member of Indian delegation B C Ranu France of scientists Department of Chemistry, Osaka To deliver a talk B C Ranu University and Tokyo University of Science, Japan Department of Chemistry, University To deliver a talk B C Ranu of California, Santa Barbara, IACS ANNUAL REPORT 2007-08  143

USA International Summer School on ‘Polymeric To deliver series of lectures to the P Dastidar and supramolecular gels’ organized by international students/participants International Center for Materials Research, of the school University of California, Santa Barbara

Physical Chemistry

IUPAC General Assembly, Torino, Italy, Member of Indian Delegation K Bhattacharyya 2007 Polymer Science Unit ESRF and Centre de Research Sur des Synchrotrom work and Invited A K Nandi Macromolecules Vegetables, Grenoble, lecture at CRSMV France Dept. of Chemical Engineering, University Invited lecture A K Nandi of Louis Pasteur, Strasbourg, France Institut Charles Sadron, Strasbourg, France Indo-French Collaborative work A K Nandi and invited lecture Gordon Research Conference Ventura, Poster presentation A K Nandi California, USA Singapore International Chemistry Oral Presentation T K Mandal Conference at National University of Singapore ESRF Grenoble and Institut Charles Sadron, Synchroton X-ray and S Manna France collaborative work

Raman Center for Atomic Molecular and optical Sciences

Computational Science and Engineering To confer on the tripartite D Mukherjee Centre of Royal Swedish Academy of agreement between KTH, IACS Technology (KTH) Sweden about the and Beijing University and to common platform present the Indian Scenario on high-performance computing at the Summer School on High Performance Computing Max-Planck- Physik Komplexer Systeme, Visit and deliver a series of D Mukherjee Dresden, Germany, May 21-28, 2007 lectures and interact with the students Eotvos Lorand University, Budapest, Visit and deliver a series of D Mukherjee Hungary lectures Trieste, Italy Attend 18th General Meeting D Mukherjee 144  IACS ANNUAL REPORT 2007-08

of TWAS Dipartimento di Chimica of University of Visit and deliver a series of D Mukherjee Ferrara lectures University of Waterloo, Canada Visit and deliver a series of D Mukherjee lectures

(vi) Conference / Symposia participated as per table below:

(a) Within the Country :

Name of Converence / Symposia Activity / Role Name of the Faculty /Staff/ Fellow

Materials Science

A short course on Advanced Techniques for Participant S Manna Materials Characterization :Microscopy and Diffraction, MRSI, Kolkata (ATMC-07), October 29 - November 2, 2007 52nd DAE Solid State Physics Symposium, Poster presentation S Manna Mysore, December 27 -31, 2007 3rd Indo-Japan conference on ferroics and Chaired a session S K De Multiferroics, IACS, kolktata, February 4 - 6, 2008

Solid State Physics

Workshop & Conference on Electronic Chaired a Session Attended M Mukherjee Structure: Theory and Application B Chattopadhyay D K Hazra, V Singh 37th National Seminar on Crystallography, Attended/Poster Presentation B Chattopadhyay, Department of Physics, Jadavpur University, D K Hazra Kolkata, February 6-8, 2008 M Mukherjee Workshop on High Performance Computing, Attended B Chattopadhyay IACS, April 23-26, 2007 International Conference on Magnetic Poster presentation P Dasgupta Materials (ICMM), SINP, Kolkata, December 11-16, 2007 3rd Indo-Japan Conference on Ferroics and Attended / Poster presentation S Giri, S Majumdar Multiferroics S Chatterjee A Karmakar A Bhattacharyya S Karmakar, E Bose P K Jana, S Sarkar ICMS-ICMR Winter School on Chemistry Poster presentation P K Jana and Physics of Materials IACS ANNUAL REPORT 2007-08  145

IWPSD-2007 workshop, December 16-20, Oral presentation S Sahu 2007, IIT, Mumbai and TIFR 52nd DAE SSP Symposium, December Oral / Poster presentation A K Rath, B C Das, 26-30, 2007, Mysore University, Mysore K De, M Patra, S Chatterjee, S Majumdar International Conference on Magnetic Poster presentation S Giri Materials (ICMM) International Conference on Ferromagnetic Poster presentation S Chatterjee Shape Memory Alloys, S N Bose National Centre for Basic Sciences, Kolkata, India, November 14 - 16, 2007

Theoretical Physics

Drug Design workshop, IISc, Bangalore, Participated A Pan July 30 – August 3, 07

Training Course on Computational aspects Participated T Naskar of Fluid Dynamics, JNCASR, Jakur, Bangalore, August 18 – December 3, 2007

Seminar at Inst. of Phys., Bhubaneswar, Participated and delivered talk K Ray September 2 –5, 2007

Conf. on History of Science, SINP, Kolkata, Participated and delivered talk J K Bhattacharjee October 4 –5 , 2007, 2007

Advanced String Theory, Inst. of Phys., Participated K Ray and Bhubaneswar, October 8 –14, 2007 S Paulchowdhury

Photonics workshop at IIT-Kharagpur, Participated and delivered talk J K Bhattacharjee October 11 –12, 2007

Familiarisation and Sourcing of Microbial Participated J Chakrabarti (Archaeal) Samples From East Calcutta Wetlands for Analysis, October 15 –18, 2007

Indian String Conference, HRI, Allahabad, Participated S Paulchowdhury October 15 –19, 2007

6th meeting of the Field Theoretic Aspects Participated and delivered talk S Sengupta of Gravity (FTAG-VI), HRI, Allahabad, November 13 –18, 2007

Workshop on Correlated Electrons and Participated S S Mandal Frustrated Magnetism (CEF07), Goa, Org. by Cent. For Theo. Sciences, TIFR, November 25 – December 5,2007

SERC Preparatory School in Theoretical Participated and delivered lecture S Roy High Energy, Dept. of Phys., BHU, course Benaras, December 3 –15, 2007 146  IACS ANNUAL REPORT 2007-08

SERC Preparatory School in Theoretical Participated P Ghosh High Energy, Dept. of Phys., BHU, Benaras, November 26 – December 15, 2007

Platinum jubilee conf. on Theoretical Participated and delivered talk J K Bhattacharjee Physics, ISI, Kolkata, December 7, 2007 Training Course on Computational aspects Participated T Naskar of Fluid Dynamics, JNCASR, Jakur, Bangalore, December 11, 2007 – January 11, 2008 Workshop on Quantum Correlation and Participated and delivered talk S S Mandal Quantum Computing (QCQC07) at IIT- Kharagpur, December 11 –13, 2007 Workshop on Quantum Correlation and Participated D Majumdar Quantum Computing (QCQC07), IIT, Kharagpur, December 11 –13, 2007 Indo-French Conf. on RNAi in Genome Participated and Poster presented B Mallick Control, Cent. For Cellular & Molecular Biology, Hyderabad, December 12 –14, 2007 Indo-French Conf. on RNAi in Genome Participated and delivered talk Z Ghosh Control, Cent. For Cellular & Molecular Biology, Hyderabad, December 12 –14, 2007 Topical Conference on From Strings to LHC-II, Bangalore, December 19 –23, 2007 Participated and delivered talk S Sengupta

Topical Conference on From Strings to Participated U Chattopadhyay LHC-II, at Bangalore, December 19 –23, 2007 10th Workshop in High Energy Physics Participated D Das Phenomenology (WHEPP-X), Ins. of Math. Sciences, Chennai, January 2 –13, 08 Tropical Conf. on Atomic & Molecular Participated and Paper presented S Chakraborty Physics-TC2008, Sardar Patel University, Gujrat, January 3 –5, 08 C.K.Majumdar Memorial Lecture, Participated J Chakrabarti S N Bose Centre, Kolkata, January 4, 2008 Workshop on Non-Perturbative Gauge Participated P Majumdar Theories and Gravity-2008, S N Bose National Centre for Basic Sciences, Kolkata, January 7 –12, 2008 School on Low Dimensional Nanoscopic Participated S S Mandal , Physics, HRI, Allahabad, January 28 – S P Mukherjee and February 9, 2008 D Majumdar SERC Main School in Theoretical High Participated J Mitra and IACS ANNUAL REPORT 2007-08  147

Energy Physics, IIT- Bombay, February P Ghosh 6 -26, 2008 Higgs Hunters Meeting 2008, (Organised Participated U Chattopadhyay by Visva-Bharati and RECAPP, HRI, Allahabad), Visva-Bharati, Santiniketan, February 7 -8, 2008 Higgs Hunters Meeting 2008, (Organised Participated and delivered talk S Roy and D Das by Visva-Bharati and RECAPP, HRI, Allahabad), Visva-Bharati, Santiniketan, February 7 -8, 2008

Conference in Neutrino Physics – “Nu- Participated S Roy Horizons”, HRI, Allahabad, February 13 -15, 2008

Workshop on Physics of warped extra Participated and delivered talk S Sengupta, S Roy dimensions, IIT-Kharagpur, February 21-23, & R Koley 2008

Seminar at St. Xavier College, Kolkata, Participated J Chakrabarti February 29, 2008

Workshop on Recent Trends in Condensed Participated and delivered talk S S Mandal Matter, SINP, Kolkata, March 7 – 8, 2008

Workshop on High Energy Physics and Participated and delivered talk S Roy Cosmology (HEPCOS-2008), Center for Theo. Phys., Jamia Islamia Univ., New Delhi, March 11 -12, 2008

1st State Level Seminar on Recent Advances Participated and delivered talk Sumana Chakraborty in Material Science, Bishnupur, Bankura, West Bengal, India, March 27-28, 2008

Workshop on Complex Systems with special Participated B Mallick & emphasis on Complexity of Living Systems, Z Ghosh WBUT, Kolkata, March 17 -28, 2008

One Day State Level (UGC) Seminar on Participated and delivered talk S Sengupta Understanding the Fundamentals of Physical and Chemical Sciences, Dum Dum Motijheel College, Kolkata, March 28, 2008

Biological Chemistry

International Conference on Soft Systems, Poster Presentation S K Das Organized by Indian Society of Surface G C Panda Science and Technology, Kolkata, February 13-15, 2008

International Symposium on Recent Trends Poster Presentation S Debnath, in Surface and Colloid Science, Indian R N Mitra & 148  IACS ANNUAL REPORT 2007-08

Statistical Institute, Kolkata, November P K Das 15-16, 2007

Joint Indo-German bilateral Seminar, on Poster Presentation S Roy Antimicrobial Drug Resistance and the Development of New Antibiotics, INSA, New Delhi, November 22-25, 2007

10th CRSI-RSC (2nd) National Symposium Poster Presentation S Roy in Chemistry, Dept. of Inorganic and P K Das Physical Chemistry, IISc., Bangalore, January 31 – February 3, 2008

International Conference on Soft Systems, Invited Speaker P K Das Center for Surface Science, Dept. of Chemistry, Jadavpur University, Kolkata, February 13-15, 2008

International Conference on Soft Systems, Poster Presentation A Shome, Center for Surface Science, Dept. of D Das & Chemistry, Jadavpur University, Kolkata, R N Mitra February 13-15, 2008

International Conference on Nanoscience Poster Presentation R Mukhopadhya & and Technology 2008, Chennai, February & attendance T Banarjee 27-29, 2008

Inorganic Chemistry

12th Biennial Symposium on Modern Trends Chaired a Session P Banerjee in Inorganic Chemisty (MTIC-XII), December 6 - 8, 2007

Alexander von Humboldt Western Regional Invited Speaker P Ghosh Humboldt Kolleg on Nanotechnology Education, Science and Technology & Emerging Applications, at Hotel Clarks, Jaipur, Rajasthan, September 28 - 30, 2007

Modern Trends in Inorganic Chemistry Invited Speaker P. Ghosh (MTIC-XII) at Indian Institute of Technology Madras, December 6 - 8, 2007

Chemical Research Society of India (Kolkata Participated R Mondal Chapter), Jadavpur University, Kolkata, August 2, 2007

Modern trends in Inorganic Chemistry Participated R Mondal (MTIC-XII), Deptt. of Chemistry, IIT, Madras, India, December 6 - 8, 2007

37th National Seminar on Crystallography, Participated R Mondal Jadavpur University, Kolkata, February 6 - 8, IACS ANNUAL REPORT 2007-08  149

2008

Organic Chemistry

Chemical biology and Drug Discovery Invited participant S Sinha conducted by ILS, University of Hyderabad Campus, January 29, 2008

Polymer Science Unit International Conference of Advanced Invited Lecture A K Nandi Materials, IUMRS-ICAM-2007, Bangalore, October 8 -13, 2007 Colloquium on perspectives of Polymer Organizer & invited lecture A K Nandi Science & Technology, IACS, Kolkata, December 22, 2007 International Conference on Nano Science Poster Presentation M R Rashid & and Technology (ICONSAT-2008), E Dinda Chennai, India, February 27 - 29, 2008 One-day Annual In-house Symposium of Lecture T K Mandal Centre for Advanced Materials, IACS, Kolkata, July 13, 2007

Centre for Advanced Materials International Conference on Nanoscience Invited Lecture D D Sarma and Technology (ICONSAT) 2008, February 27 - 29, 2008 ICMM2007 at SINP, Dec.11 – 15, 2007 Invited Lecture D D Sarma Bangalore Nano., December 6 - 7, 2007 Invited Lecture D D Sarma Indo-Sweden conference, IACS, Kolkata, Invited Lecture D D Sarma January 17, 2007 Indo-Japan Workshop on Quantum Beam Invited Lecture D D Sarma Science Programme, SINP, Kolkata, March 7 – 12, 2008 Inaugural session Indo-Australia symposium, Invited Lecture D D Sarma December 19, 2007 Consultation Meeting at DST, Delhi on Invitee Member D D Sarma India-EU Coordinated Call for Proposals on Computational Materials Science, June 22, 2007

Library International Conference on Future of Paper Presentation A Dasgupta Knowledge Organization in the Networked Environment (IKONE 2007), ISI, Bangalore, September 3 – 5, 2007 150  IACS ANNUAL REPORT 2007-08

Annual National Conference organized by Paper Presentation A Dasgupta Indian Library Association, Osmania University, Hyderabad during November 3-5, 2007 National Conference on XXVI IASLIC National Convener A Dasgupta Computer Application, Jamia Milia Islamia University, New Delhi, December 25- 29, 2007

(b) Abroad :

Name of Converence / Symposia Activity / Role Name of the Faculty /Staff/ Fellow

Materials Science

Beijing & Taiwan Collaborative research activity S K Saha Visiting Professor

Solid State Physics

American Ceramic Society 2007 Glass and Invited speaker and chairperson A Ghosh Optical Materials Division Meeting and of a session 18th University Conference on Glass International Conference in Optical, Oral presentation & chaired D Basak Optoelectronic and Photonic Materials and a session Applications, London, July 30 – August 3, 2007 4th International conference on materials for Oral presentation D Basak advanced technologies, Singapore, July 1- 6, 2007

Spectroscopy

35th International Conference in Physical Invited talk T Ganguly Chemistry held in Xiamen University, Xiamen, China , September 25, 2007 Institute of Atomic and Molecular Sciences Visit for collaboration T Ganguly (IAMS), Academia Sinica, Taipei, Taiwan, December, 2007 Institute of Atomic and Molecular Two invited talks T Ganguly Sciences (IAMS), Academia Sinica, Taipei, Taiwan

Theoretical Physics

Summer School on Particle Physics and Participated D Das Cosmology, Beijing, China, June 18–26, IACS ANNUAL REPORT 2007-08  151

2007 String 2007 Conference, Instituto de Fisica Participated and delivered talk K Ray Teorica, UAM, Madrid, Spain, June 25– 29, 2007 STATPHYS-23, 23rd Int. Conf. on Participated and poster presented S Biswas Statistical Physics, IUPAP, Conf. Centre, Genova, Italy, July 9–13, 2007 XXV ICPEAC, Freiburg, Germany, July Participated S Chakraborty 25–31, 2007 XXV ICPEAC, Freiburg, Germany, July Participated and Paper presented C Sinha 25–31, 2007 14th Int. Symposium on (e,2e) DPI and Participated and delivered talk C Sinha related Process, Konigstein, Germany, August 1– 4, 2007 IV Int. Workshop on Low Energy Positron Participated S Chakraborty and Positron Physics, Reading, England Summer Institute 2007 on Particle Physics Participated D Das and Cosmology at Yukawa Inst. For Theo. Phys., Yamanashi, Japan, August 3–10, 2007 Magnetic and Superconducting Materials Participated and poster presented S P Mukherjee (MSMO7) Khiva, Uzbekistan, September 25–30, 2007 22nd tRNA workshop, Upsala University, Participated and poster presented S Das Sweden, November 1– 6, 2007 2nd Asian Winter School on String Participated S Paulchowdhury Theory, Kusatsu, Japan, January 14–25, 2008 2008 Miami Winter Symposium, The Univ. Participated and poster presented B Mallick and Biochemistry and Molecular Foundation, Z Ghosh Miami, Florida, USA, Feruary 2–6, 2008 Spring School on Superstring Theory and Participated S Paulchowdhury Related Topics, Abdus Salam International Centre for Theo. Phys., Trieste, Italy, March 27–April 4, 2008

Inorganic Chemistry

234th National Meeting of the American Invited Speaker P Ghosh Chemical Society in Boston, USA, August 19-23, 2007

Organic Chemistry

International Symposium on Atomic To deliver a talk B C Ranu 152  IACS ANNUAL REPORT 2007-08

Technologies, Department of Chemistry, Osaka University and Tokyo University of Science, Japan

Polymer Science Unit

Gordon Research Conference on Composites, Poster presentation A K Nandi Crown Plaza, Ventura, California, USA, January 13-18, 2008 Singapore International Chemistry Oral Presentation T K Mandal Conference 5 (SICC-5), Singapore, December 16 -19, 2007 IACS ANNUAL REPORT 2007-08  153

(vii) Name of the Research Collaborators as per table below:

Name of the Faculty Name of the Collaborator

Materials Science

Prof. G P Das (1) Prof. Y P Feng and Dr. Chen Ping, National University, Singapore;

(2) Dr. D Karmakar, Max Planck Insitute Stuttgart; (3) Dr. Prasenjit Sen., Harish-Chandra Research Institute, Allahbad; (4) Prof. Y Kawazoe, Institute of Materials Research, Tohoku University, Sendai, Japan; (5) Dr. I Dasgupta, SSP, IACS; (6) D Karmakar, MPI, Stuttgart; (7) C Majumdar, BARC; (8) A Kshirsagar, Pune University; (9) P Sen, HRI; (10) T Saha Dasgupta, SNBNCBS; (11) P Murgan, IMR, Sendai; (12) M S Bahramy, IMR, Sendai

Prof. B N Dev (1) S Bera, K Bhattacharjee, (2) S Mathew, (3) M Rundhe, (4) S Roy, (5) A Roy, J Kamila – These are Research Fellows working under the supervision of B N Dev at IOP, Bhubaneswar;

(1) B Joseph, IOP, Bhubaneswar; (2) U M Bhatta, IOP, Bhubaneswar; (3) J Ghatak, IOP, Bhubaneswar; (4) B R Sekhar, Bhubaneswar; (5) P V Satyam, IOP, Bhubaneswar; (6) D P Mahapatra, IOP, Bhubaneswar; (7) K Kundu, IOP, Bhubaneswar; (8) G Kuri, Paul Scherrer Institute, Switzerland; (9) R Groetzschell, Research Centre Dresden-Rossendorf, Germany; (10) Dr. R Groetzschel, Dr. L Bischoff, Research Centre Dresden-Rossendorf, Germany; (11) Prof. K Kundu, (12) Prof. D P Mahapatra, (13) Dr. P V Satyam, Institute of Physics, Bhubaneswar

Dr. A Bhaumik (1) Dr. N K Mal, Tata Chemicals Limited, Pune; (2) Dr. A Mitra, Habra Srichaitanya College, West Bengal; (3) N K Mal; (4) A Mitra

Dr. S K Saha (1) Prof. Y K Su, NCKU, Taiwan; (2) Prof. S Datta, Purdue University, USA

Solid State Physics

Prof. B K Chaudhuri (1) A Yoshizawa, Hirosaki University, Japan; (2) S L Wu, Tatung Institute of Technology, Taiwan; (3) H D Yang, National Sun Yat Sen University, Taiwan; (4) H Sakata, Tokai University, Japan; (5) H Chou, National Sun Yat Sen University, Taiwan; (6) A Das, BARC, India; (7) A Maignan, CRISMAT, France; (8) G A Gehring, University of Sheffield, UK; (9) T Watanabe, Tokyo University of Science

Prof. M Mukherjee (1 ) M Hellewel, University of Manchester, UK; (2) V V Sureshbabu, Bangalore University, India

Prof. A Ghosh (1) S W Martin, Iowa State University, USA; (2) U Hoppe,Rostock University, Germany

Dr. I Dasgupta (1) O K Andersen, Max Planck Institute for Solid State Research, Stuttgart Germany; (2) L Nordstorn and B Sanyal, Uppsala University, Sweden; (3) J Bobroff, Universite’ Paris Sud, Orsay, France 154  IACS ANNUAL REPORT 2007-08

Spectroscopy

Prof. P K Mukherjee T K Mukherjee Prof. G B Talapatra (1) Amlan Jyoti Pal, SSP Dept., IACS; (2) J Choudhury Prof. Biswanath Mallik Nobuhiro OHTA, Research Institute for Electronic Science, Hokkaido University, Japan Prof. Tapan Ganguly (1) Dr Wen-Bih Tzeng, Institute of Atomic and molecular Science, Academia Sinica, Taipei, Taiwan; (2) Prof. S Fukuzumi, Osaka University, Osaka, Japan; (3) Prof. D R Worrall, Laughborough University, UK; (4) Prof. A De, Ex-professor, Organic Chemistry, IACS; (5) Dr. T Sahu; (6) Dr. C Deb; (7) Dr. T Misra Prof. Subir Kumar Roy T Pal Majumder, Prabitra Chakraborty

Theoretical Physics

Prof. J K Bhattacharjee (1) Prof. K Bhattacharya, Dept of Chemistry, Calcutta University; (2) Prof. R Ramaswamy, School of Physical Sciences, Jawaharlal Neheru University, New Delhi; (3) Prof. S Pratik Khastagir, Dept of Physics and Meteorology, Indian Institute of Technology, Kharagpur; (4) Prof. U Kaatze, Physics Institute III, University of Goettingen, Germany Prof. J Chakrabarti (1) S Sahoo, Raidighi College, CU; (2) F H M Faisal, Univ. of Bielefield; (3) U Rajbhandary, MIT, USA Prof. C Sinha (1) S Mukhopadhyay; (2) K Basu Choudhury; (3) N C Deb Prof. S Sengupta (1) B Mukhopadhyaya, HRI, Allahabad; (2) S Das, Univ. of Lethbridge, Canada; (3) S Kar, IIT-Kharagpur; (4) D Chaudhuri, Delhi Univ.; (5) R Srikanth, HRI, Allahabad; (6) R Koley, IACS; (7) T Ghosh, IACS Dr. U Chattopadhyay (1) A Datta, Jadavpur University; (2) P Konar, Karlsruhe, Germany; (3) S Poddar, Jadavpur University; (8) D P Roy, TIFR, Mumbai Dr. S S Mandal (1) J K Jain, Penn-State University, USA; (2) T V Ramakrishnan, BHU, Varanasi; (3) S Gupta, Birla Institute Technology, Messra Dr. S Roy (1) A Ibarra, DESY, Hamburg; (2) D K Ghosh, Delhi Univ.; (3) K Huitu, Univ. of Helsinki, Finland; (4) T Honkavaara, Univ. of Helsinki, Finland; (5) R Kinnunen, Helsinki Institute of Physics, Finland; (6) J Laamanen, University of Dortmund, Germany; (7) S Lethi, Helsinki Institute of Physics, Finland; (8) T Salminen, Helsinki Institute of Physics, Finland; (9) S Sengupta, Theo Phys, IACS; (10) P Ghosh, Theo Phys, IACS; (11) D Das, Theo Phys, IACS

Dr. P Majumdar (1) R V Gavai, TIFR, Mumbai; (2) S Datta, TIFR, Mumbai; (3) N Mathur, TIFR, Mumbai; (4) B Brandt, University of Muenster, Germany; (5) O Philipsen, University of Muenster, Germany; (6) M Gravina, University of Calabria; (7) E Gasparim, University of Edinburgh, (8) S Sen, Trinity College, Dublin; (9) N Chakrabarty, SA, Positional Astronomy Centre, Kolkata; (10) S Majhi, Baylor University, USA; (11) N C Chandra, Dept. of Phys., IIT-Kharagpur; (12) U Sinha, Institute for Quantum Computing, Ontario, Canada; (13) A Ghosh, Dept. of Physics, Federal of Amazonas, Manaus, Brasil; (14) R IACS ANNUAL REPORT 2007-08  155

Mukherjee, Lecturer, Vivekananda College; (15) T Ghosh, Visiting Fellow; (16) D Chaudhuri, Univ. of Delhi; (17) B Mukhopadhyay, HRI, Allahabad; (18) S Das, Univ. of Lethbridge; (19) A Mukhopadhyay, HRI, Allahabad; (20) A Kumar, IOP, Bhubaneswar; (21) S Sengupta, IOP, Bhubaneswar

Biological Chemistry

Prof. M Ray (1) Lokmanya Medical Research Center, Pune, India; (2) Theo Wallimann Institute of Cell Biology, ETH-Hönggerberg, HPM, D24 CH-8093, Zurich, Switzerland; (3) Lifecare Innovation Pvt. Ltd., Gurgaon, Haryana, India

Organic Chemistry

Prof. A Sarkar (1) Othman Bouloussa, Institut Curie, Paris, France; (2) Michele Salmain, ENSCP, Paris, France; (3) Simon Woodward, University of Nottingham, UK; (4) David Knight, Cardiff University, UK Prof. S Lahiri (1) G Maiti; (2) K K Rana Dr. P Dastidar (1) Prof. J A Navarro, Spain; (2) Prof. Joan Ribas, Spain; (3) Prof. Derek Tocher, UK

Physical Chemistry

Prof. S P Bhattacharyya (1) Dr. P Chowdhury, Calcutta University; (2) Dr. D K Maity, BARC, Bombay; (3) Dr. R Saha; (4) Dr. K Maji Prof. D N Nath Dr. Nikhil Guchhait, Dept. of Chemistry, Calcutta University

Polymer Science Unit

Prof. A K Nandi Prof. J M Guenet, Institute Charles Sadron Strasbourg, France

Centre for Advanced Materials

Prof. D D Sarma (1) Dr. Priya Mahadevan, SNBNCBS; (2) Dr. Tanusri Saha Dasgupta, SNBNCBS; (3) Dr. N Pradhan, Material Sc., IACS; (4) Prof. T Takahasi, Tohoku University ; (5) Prof. A Fujimori, Tokyo University; (6) Prof. Chandan Dasgupta, IIsc., Bangalore; (7) Prof. T V Ramakrishnan, IIsc., Bangalore; (8) Prof. Heinz Amenitsch 156  IACS ANNUAL REPORT 2007-08

Ph. D. (SCIENCE) DEGREE AWARDED TO RESEARCH WORKERS

Sl. Name Title of thesis University Department Supervisor No

1. Kousik Dutta Transport and dielectric Jadavpur Materials S K De properties of Nanostructured Science Materials

2. Anuja Datta Tailoring of Optical and -do- -do- A Patra Magnetic Properties of Sulfide Semiconductors in Different Nanoforms using Different Dopants

3. Godhuli Sinha Synthesis and Characteriza- -do- -do- A Patra tion of Nanocrystalline Thin Films of Gallium Oxide and Gallium Nitride

4. Soumen Das Transparent conducting -do- -do- S K Saha semiconductor oxide based nanocomposite thin films: synthesis and characterization

5. Subhrangsu Taran Transport properties of some -do- Solid State B K Chaudhuri colossal magnetoresistive Physics material

6. Muklesur Rahman Dielectric and Electro-optical - do- - do- B K Chaudhuri properties of Ferroelectric Liquid Crystal

7. Shilpi Karmakar Transport, magnetic and - do- - do- B K Chaudhuri other properties of colossal magnetoresistive oxides undergoing semiconducting to metallic transition

8. Swastik Mondal Crystallographic studies of - do- - do- M Mukherjee organic compounds, metal- organic complexes and quasicrystalline materials using x-ray diffraction techniques

9. Papri Dasgupta Investigation of thermophysical - do- - do- M Mukherjee properties of rare earth & IACS ANNUAL REPORT 2007-08  157

pyrochlores exhibiting D Ghosh geometric frustration and magnetic ordering in some rare earth insulators 10. Dibakar Dutta Study of Conduction - do- - do- A Ghosh Mechanism in Some Fast Ion Conducting Glasses and Nanocomposites 11. Basudev Pradhan Organic Photovoltaic devices: - do- - do- A J Pal Role of heterostructures and device architecture 12. Ranajit Ghosh Studies on sol-gel derived - do- - do- D Basak

ZnO and MgxZn1-xO thin films for optoelectronic applications 13. Narayan Ch. Bera Ab initio study of spectro- - do- Spectroscopy A K Das scopic properties of weakly bound molecules 14. A Chattopadhyay Study of some Laser-assisted Jadavpur Theoretical C Sinha collision processes of Atomic Physics and Ionic targets by charged particle impact 15. Urmimala Further Characterization of Jadavpur Biological M Ray Chatterjee Artocarpus lakoocha lectin with Chemistry & respect to its biological A K Guha properties 16. Jhuma Pramanik Lectins as tool to study - do – - do – B P chatterjee proteomics and glycomics of & cancer ,T cell lines M Ray 17. Sudipta Chatterjee Studies on chitosan with - do – - do – B P Chatterjee special reference to production & and biotechnological A K Guha application 18. Sujoy Kumar Das Studies on removal of some - do – - do – A K Guha environmental pollutants from water using microbial biomass 19. Debapratim Das Biocatalysis and Chemical - do – - do – P K Das Reactivity in the Microdomain of Novel Self-Assemblies 20. Meenakshi Ghosh Transition metal complexes - do- Inorganic K Nag of polypyridine ligands Chemistry 21. Sanchita Goswami Synthesis, structure and - do- - do- P Banerjee properties of mono- and 158  IACS ANNUAL REPORT 2007-08

polynuclear manganese and iron 22. Jishnunil Synthesis, structure and - do- - do- P Banerjee Chakraborty properties of some complexes of d8 metal(II) ions 23. Debdas Mandal Studies on metal complexes - do- - do- M Chaudhury of phenol-based chelating agent 24. Priyabrata Banerjee Studies of Coordination - do- - do- S Goswami Chemistry -of Ligands with Large Denticity 25. Anasuya Sanyal Studies of Chemistry of - do- - do- S Goswami Heavier Transition Elements Involving Redox Non- Innocent Ligands 26. Tanmay Mandal Development of Novel - do – Organic B C Ranu Synthetic Procedures by Chemistry Indium and Other Metal Mediated Reactions 27. Ranjan Jana Development of Green - do – - do – B C Ranu Synthetic Procedures Using Ionic Liquid and Alternative Benign Reaction Media 28. Subhash Banerjee Search for Green Alternatives - do – - do – B C Ranu for Toxic Reagents and Solvents Used in Chemical Reactions 29. Niladri Sarkar Synthesis of cyclic compounds - do – - do – S Ghosh with potential biological activity 30. Saikat Sinha Synthetic studies on - do – - do – S Ghosh biologically active carbocyclic compounds 31. Somnath Yadav Tricyclo[3.3.0.02,8]-octanone: - do – - do – S Lahiri Photochemical Syntheses from b,g-enones and Their Regioselective Cyclopropyl Ring Cleavage 32. Samaresh Jana Synthetic Studies towards - do – - do – S C Roy Natural Products of Biological Importance and Related Compounds 33. Rajendra Saha Development of Soft- - do – Physical S P computing Techniques for Chemistry Bhattacharyya IACS ANNUAL REPORT 2007-08  159

Molecular Electronic Structure Calculations and Exploration of Complex Potential Energy Landscapes of Clusters 34. Kaushik Maji Modeling Quantum Dynamics - do – - do – S P of Complex Systems Bhattacharyya 35. Dhruba Banerjee Quantum theory of activated - do – - do – D S Ray rate processes 36. Debashis Barik Some aspects of quantum - do – - do – D S Ray Brownian motion and application to rate processes 37. Sandip Kar Application of nonlinear - do – - do – D S Ray dynamics to some model biological systems 38. Debarshi Das Multiporous Polymeric Jadavpur Polymer A K Nandi Gupta Materials from Science Unit Thermoreversible Poly (vinylidene fluoride) Gels and Intercalates 39. Biplab Kuila Studies on Poly(3-alkyl - do – -do- A K Nandi thiophene) Nanocomposites 40. Swarup Manna Studies on Nanocomposites - do - - do – A K Nandi of Poly(vinylidene fluoride) 41. Satyabrata Si Design and Synthesis of -do- - do – T K Mandal Metal Peptide Nanoconjugates and Their Self Assembly 42. Atanu Kotal Synthesis of Organic/ - do - -do- T K Mandal Inorganic Hybrid Materials by Living Polymerization 160  IACS ANNUAL REPORT 2007-08

Research Publications in Peer Reviewed Journals

Materials Science

1. Population transfer to excited vibrational levels of H2 molecule by stimulated hyper-Raman passage with chirped laser pulses – C Sarkar, R Bhattacharya, S S Bhattacharyya and S Saha, J. Chem. Phys., 127, 104304 (2007)

2. High temperature ferromagnetism in Fe-doped ZnO : a density functional investigation – D Karmakar, I Dasgupta, G P Das and Y Kawazoe, Materials Transaction, 48 2119 (2007)

3. GaN codoped with Mn and Cr: Study of the electronic structure of a spintronics material using spin-polarized calculations – N Tandon, G P Das and A Kshirsagar, Phys. Rev., B 77 (2008)

4. Co:CdS Diluted Magnetic Semiconductor Nanoparticles: Radiation Synthesis, Dopant-Defect Complex Formation and Unexpected Magnetism – K A Bogle, S Ghosh, S D Dhole, V N Bhoraskar, L-F Chi, N D Browning, D Kundaliya, G P Das and S B Ogale, Chem Mater., 20, 440 (2008)

5. Coexistent compressive and tensile strain in Ag thin films on Si(111)-(7×7) surfaces – D K Goswami, K Bhattacharjee, B Satpati, S Roy, G Kuri, P V Satyam and B N Dev, App. Surf. Sci., 253, 9142 (2007)

6. Microstructural evolution, atomic migration and FePt nanoparticle formation in ion irradiated Pt(Fe)/C(Fe) multilayers – S Bera, S Roy, K Bhattacharjee, G Kuri and B N Dev, J. Appl. Phys., 102, 014308 (2007)

7. KeV Ag ion irradiation induced damage on multiwalled carbon nanotubes – S Mathew, U M Bhatta, B Joseph and B N Dev, Nucl. Instr. Meth. Phys. Res., B 264, 36 (2007)

8. The effects of 2 MeV Ag ion irradiation on multiwalled carbon nanotubes – S Mathew, U M Bhatta, J Ghatak, B R Sekhar, B N Dev, Carbon, 45, 2659 (2007)

9. Growth of fullerene on Ag and hydrogen-passivated Si substrates: Effect of electron beam exposure on growth modes – M Rundhe, B N Dev, Appl. Surf. Sci., 254, 4531 (2008)

10. Electronic structure of Ag-adsorbed nanowire-like stripes on Si(110)-(16x2) surfaces. I. An in- situ STM and STS experiment – K Bhattacharjee, A Roy, K Kundu, B N Dev, Phys. Rev., B 77, 115430 (2008)

11. Electronic structure of Ag-adsorbed nanowire-like stripes on Si(110)-(16x2)surfaces. II. A one- dimensional tight-binding model with Green’s function approach – K Bhattacharjee, A Roy, K Kundu, B N Dev, Phys. Rev., B 77, 115431 (2008)

12. Surface roughness of ion-bombarded Si(1 0 0) surfaces: Roughening and smoothing with the same roughness exponent – A Roy, K Bhattacharjee, H P Lenka, D P Mahapatra and B N Dev, Nucl. Instr. Meth. Phys. Res., B 266, 1276 (2008)

13. Crystallization and characterization of NLO material L-arginine formomalate –T Mallik and T Kar, Materials Letters, 61, 3826 (2007)

14. Growth and Characterization of Nonlinear Optical Crystal Zinc Tris (thiourea) Sulphate in Presence of L-arginine – S Moitra and T Kar, Optical Materials, 30, 508 (2007) IACS ANNUAL REPORT 2007-08  161

15. A Study on the Growth and Characteristic Properties of ZTS Single Crystal – S Moitra and T Kar, Materials Chemistry and Physics, 106, 8 (2007)

16. Growth, Optical and Thermal Characterization of Bis(thiourea)zinc Chloride Single Crystals – S Moitra and T Kar, Optical Materials, 30,1621 (2008)

17. Electrical conductivity and dielectric properties of SiO2 nanoparticles dispersed in conducting polymer matrix – K Dutta and S K De, J. Nanoparticle Research, 9, 631 (2007)

18. Conductivity relaxation in zirconia nanoparticles dispersed in conducting polymer – A Dey and S K De, J. Appl. Polymer Science, 105, 2225 (2007)

19. Optical and nonlinear electrical properties of SnO2 – polyaniline nanocomposites – K Dutta and S K De, Materials Letters, 61, 4967 (2007)

20. Double dielectric relaxations in SnO2 nanoparticles dispersed in conducting polymer – K Dutta and S K De, J. Appl. Phys., 102, 084110 ( 2007)

21. Thermal and electric properties of CeO2 nanoparticles dispersed in polyethylene oxide:NH4ClO4 complex – A Dey, S Karan and S K De, Solid State Ionics, 178, 1963 (2008)

22. Photoluminescence behavior of new mesostructured titania composites synthesized by novel bidentate structure directing agents – D Chandra and A Bhaumik, Microporous Mesoporous Mater., 101, 348 (2007)

23. Mesoporous silicotinphosphates with high anion exchange capacity – D Chandra, N K Mal and A Bhaumik, Stud. Surf. Sci. Catal., 172, 341 (2007)

24. Nickel Complexes with N2O Donor Ligands: Syntheses, Structures, Catalysis and Magnetic Study – J Chakraborty, M Nandi, H Mayer-Figge, W S Sheldrick, L Sorace, A Bhaumik and P Banerjee, Eur. J. Inorg. Chem., 5033 (2007)

25. Highly Luminescent Organic-Inorganic Hybrid Mesoporous Silicas Containing Tunable Chemosensor Inside the Pore-Wall – D Chandra, T Yokoi, T Tatsumi and A Bhaumik, Chem. Mater., 19, 5347 (2007)

26. Functionalized mesoporous cross-linked polymer as an efficient host for loading gold

nanoparticles and its electrocatalytic behavior for reduction of H2O2 – D Chandra, B K Jana, C Retna Raj and A Bhaumik, Chem. Mater., 19, 6290 (2007)

27. Eco-friendly, Selective Hydroxylation of C-7 Aromatic Compounds Catalyzed by TS-1 / H2O2 System under Solvent-free S-L-L type triphase conditions – P Mukherjee, A Bhaumik and R Kumar, Ind. Eng. Chem. Res., 46, 8657 (2007)

28. New organic-inorganic hybrid mesoporous tantalum oxophosphate and sulfonate tantalum oxophenylphosphate – N K Mal, M Fujiwara and A Bhaumik, J. Non-Cryst. Solids, 353, 4116 (2007)

29. Enhanced Emission from Single Component Organic Core-Shell Nanoparticles – K Dhara K Sarkar, P Roy, A Bhaumik and P Banerjee, J. Nanosci. Nanotechnol., 7, 4311 (2007)

30. Liquid phase partial oxidation of olefins over mesoporous titanium silicate molecular sieve synthesized by non-ionic templating route – M Nandi, K Sarkar and A Bhaumik, Mater. Chem. Phys., 107, 499 (2008)

31. Mesostructured polyaniline: Synthesis, characterization and conducting properties – M Nandi, 162  IACS ANNUAL REPORT 2007-08

R Gangopadhyay and A Bhaumik, Microporous Mesoporous Mater., 109, 239 (2008)

32. Mesoporous titanium oxide synthesized in the presence of a new surfactant assembly – A Mitra, A Bhaumik and B Paul, Microporous Mesoporous Mater., 109, 66 (2008)

33. A Highly Enantioselective Fluorescent Sensor for Mandelic Acid by Chiral Schiff-Base Compound – K Dhara, K Sarkar, P Roy, M Nandi, A Bhaumik and P Banerjee, Tetrahedron, 64, 3153 (2008)

34. Mesoporous hybrid zirconium oxophenylphosphate synthesized in absence of any structure directing agent – K Sarkar, T Yokoi, T Tatsumi and A Bhaumik, Microporous Mesoporous Mater., 110, 405 (2008)

35. Resonance energy from Rhodamine 6G to gold nanoparticles by stedy-state and time resolved spectroscopy – T Sen and A Patra, J. Phys. Chem. C, 112, 3216 (2008)

36. Tuning of crystal phase and luminescence properties of Eu3+ doped sodium yttrium fluoride nanocrystal – P Ghosh and A Patra, J. Phys. Chem. C, 112, 3223 (2008)

3+ 37. Upconversion in Er -doped ZrO2 nanocrystals pumped at 1.426 µm – L A Gomez, G S Mmaciel, Cid B de Araújo and A Patra, J. Appl. Phys., 103, 053507 (2008)

38. Synthesis and time-resolved photoluminescence spectroscopy of capped CdS nanocrystals – S Sadhu, P S Chowdhury and A Patra, J. Lumin., 128, 1235 (2008)

3+ 39. Crystal phase, shape and luminescence properties of LaPO4: Eu nanocrystals – P Ghosh and A Patra, J. Nanosci. & Nanotech, 8, 3458 (2008)

40. Phase and shape controlled synthesis of CdS nanocrystals and their characterization – S Sadhy, T Sen and A Patra, J. Nanosci. & Nanotech, 8, 1238 (2008)

41. Surface energy transfer from rhodamine 6G to gold nanoparticles : A spectroscopic ruler – T Sen, S Sadhu and A Patra, J. Appl. Phys. Lett., 91, 043104 (2007)

3+ 42. Influence of surface coating on physical properties of TiO2/Eu nanocrystals – P Ghosh and A Patra, J.Phys. Chem. C, 111, 7004 (2007)

3+ 43. Photoluminescence properties of nanocrystalline Tb doped Y2O3 phosphor prepared through a novel synthetic route – S Ray, A Patra and P Pramanik, Optical Materials, 30, 608 (2007)

44. Geometry-dependent interplay of long- and short-range interactions in ultracold fermionic gases : models for condensed matter and astrophysics – B Deb, G Kurizki and I E Mazets, New Journal of Physics, 10, 045013 (2008)

45. Critical Test for Altshuler-Aronov Theory: Evolution of the Density of States Singularity in

Double Perovskite Sr2FeMoO6 with Controlled Disorder – M Kobayashi, K Tanaka, A Fujimori, S Ray and D D Sarma, Phys. Rev. Lett., 98, 246401 (2007)

46. Pressure and temperature dependence of the Fano resonance in the Raman spectrum of

A2FeMoO6 systems (A = Sr, Ca) – D Marrocchelli, P Postorino, D Di Castro, E Arcangeletti, P Dore, M Cestelli Guidi, S Ray and D D Sarma, Phys. Rev. B, 76, 172405 (2007)

47. High temperature ferromagnetism in single crystalline dilute Fe-doped BaTiO3 – S Ray, P Mahadevan, S Mandal, S R Krishnakumar, C S Kuroda, T Sasaki, T Taniyama and M Itoh, Phys. Rev. B, 77, 104416 (2008) IACS ANNUAL REPORT 2007-08  163

Solid State Physics

48. Magnetocaloric effect in charge ordered Nd0.5Ca0.5MnO3 manganite – S Karmakar, E Bose, S Taran, C P Sun, H D Yang and B K Chaudhuri, J. Appl. Phys., 103, 023901 (2008)

49. Evidence of intrinsic exchange bias and its origin in spin-glass-like disordered L0.5Sr0.5MnO3

manganites (L=Y, Y0.5Sm0.5, and Y0.5La0.5) – S Karmakar, S Taran, E Bose, C P Sun, C L Huang, H D Yang and B K Chaudhuri, Phys. Rev. B, 77, 144409 (2008)

50. Importance of Double Exchange Interaction in Low Doped Ferromagnetic Insulator

La0.875Ca0.125MnO3 – E Bose, S Karmakar, B K Chaudhuri, S Pal, Solid State Comm., 145, 149 (2008)

51. Small polaron hopping conduction and magnetic frustration in electron doped charge ordered

Ca0.85La0.15MnO3 system – E Bose, S Karmakar, B K Chaudhuri, J.Phys., Condens. Matter, 19 486201(2007)

52. Correlation of structural, magnetic and transport properties with tolerance factor in low doped

La 0.875Sr 0.125-xCa xMnO3, (0 £?x £?0.125) system: Crossover from Mott to Shklovskii–Efros variable range hopping conduction – E Bose, S Karmakar, B K Chaudhuri, S Pal, C Martin, S Hébert and A Maignan, J.Phys., Condens. Matter, 19 266218 (2007)

53. High dielectric behavior and memory effect in a deformed helix ferroelectric liquid crystal with an antiferroelectric phase – A Mukherjee, M Rahman, S S Bhattacharyya, B K Chaudhuri, A Yoshizawa, Chem. Phys. Lett., 443, 71 (2007)

54. Measurement of some physical parameters of a deformed helix ferroelectric liquid crystal with an antiferroelectric phase – A Mukherjee, M Rahman, S S Bhattacharyya, B K Chaudhuri, Ind. J. Pure & Appl. Phys., 45, 674 (2007)

55. Field driven ferroelectric-ferroelectric transition: Evidence of antiferroelectric Goldstone mode in the phase – M Rahman, A Mukherjee, B K Chaudhuri, A Yoshizawa, Chem. Phys. Lett., 449, 92 (2007)

56. Colossal internal barrier layer capacitance effect in polycrystalline copper (II) oxide – S Sarkar, P K Jana, and B K Chaudhuri, Appl. Phys. Lett., 92, 022905 (2008)

57. Microstructure and dielectric properties of NaxTiyNi1-x-yO (x = 0.05 – 0.30, y = 0.02) – P K Jana, S Sarkar, H Sakata, T Watanabe, and B K Chaudhuri, J Phys. D: Appl. Phys., 41, 065403 (2008)

58. Conduction mechanism and dielectric relaxation in high dielectric KxTiyNi1-x-yO (KTNO) – P K Jana, S Sarkar, S Karmakar, and B K Chaudhuri, J. Appl. Phys., 102, 084105 (2007)

59. Review Article: The effect of monovalent alkali metals (i.E. Li,Na,K) doping at the R site of RMnO3 manganite compounds – S Bhattacharya, S Pal, S Taran, and B K Chaudhuri, Ind. J. Cryogenics, 31, 3770 (2007)

60. Review Article: Colossal magnetoresistance: Fundamental electrical transport mechanism and consequent phenomena – S Mollah and B K Chaudhuri, Ind. J. Cryogenics., 31, 129150 (2007)

61. 2,2¢-Diazinodimethylidyne)di-o-phenylene) dibenzoate – B Chattopadhyay, S Basu, S Ghosh, M Helliwell and M Mukherjee, Acta Crystal. E, 64, 0866 (2008) 164  IACS ANNUAL REPORT 2007-08

62. A novel cation induced polymeric chain in Na8[{Cu(gly)2}2]{H2(H2W12O42)}] · 24H2O: hydrothermal synthesis, spectroscopic characterization and X-ray structure analysis – D Dutta, D Maity, M Ali, M G B Drew, S Mondal, M Mukherjee, Transition Met. Chem., 33, 347 (2008)

63. Synthesis and crystal structure of a mixed valence heteropoly green compound, (PPh4)4[PMo12O40], and its use as a catalyst in olefin epoxidation – N Gharah, K Chowdhury, M Mukherjee and R Bhattacharyya, Transition Met Chem, 33, 635 (2008)

64. Field-induced spin-flop transitions of interacting nanosized a-Fe2O3 particles dispersed in a silica glass matrix – S Mukherjee, A K Pal, S Bhattacharya and S Chatterjee, J. Phys: Condens. Matter, 20, 055204 (2008)

65. Correlation of ion dynamics and structure in superionic silver tellurite glasses – D Dutta and A Ghosh, J. Chem. Phys., 128, 044511(2008)

66. Effect of ZnO nanoparticles on the structure and ionic relaxation in PEO-LiI polymer electrolytes – S Bhattacharya and A Ghosh, J. Nanosci. Nanotechnol., 8, 1922 (2008)

67. Frequency dependent conductivity of cadmium vanadate glassy semiconductor – A Ghosh, S Bhattacharya, D P Bhattacharya and A Ghosh, J. Phys.:Condens. Matter, 20, 035203 (2008)

68. Relaxation dynamics in superionic glass-nanocomposites – S Bhattacharya and A Ghosh, J. Am. Ceram. Soc., 91, 753 (2008)

69. Hopping conduction in zinc vanadate semiconducting glasses – A Ghosh, S Bhattacharya, D P Bhattacharya and A Ghosh, J. Appl. Phys., 103, 083703 (2008)

70. Silver molybdate nanoparticles, nanowires and nanorods embedded in glass- nanocomposites – S Bhattacharya and A Ghosh, Phys. Rev. B, 75, 092103 (2007)

71. Dynamics of Li+ ions in strontium metaphosphate glasses – A Dutta and A Ghosh, J. Chem. Phys., 127, 144504 (2007)

72. Relaxation dynamics of Ag4Te3O8 glass nanocomposites embedded with Ag2S nanoparticles – D Dutta and A Ghosh, J. Chem. Phys., 127, 044708 (2007)

73. Electrical conductivity and relaxation in mixed alkali tellurite glasses – S Ghosh and A Ghosh, J. Chem. Phys., 126, 184509 (2007)

74. Electrical transport properties of semiconducting lithium molybdate glass-nanocomposites – S Bhattacharya and A Ghosh, J. Chem. Phys., 127, 194709 (2007)

75. Structural and optical properties of lithium barium bismuthate glasses – A Dutta and A Ghosh, J. Non-Cryst. Solids, 353, 1333 (2007)

76. A bit per particle: Electrostatic assembly of CdSe quantum dots as memory elements – B C Das, S K Batabyal, and A J Pal, Adv. Mater., 19, 4172 (2007)

77. Memory applications and electrical bistability of semiconducting nanoparticles – do the phenomena depend on bandgap – B C Das and A J Pal, Small, 4, 542 (2008)

78. pn-Junction Rectifiers based on p-ZnO and n-ZnO Nanoparticles – K Mohanta, S K Batabyal, and A J Pal, Chem. Mater., 19, 3662 (2007)

79. Layer-by-layer assembly of capped CdSe-nanoparticles electrical bistability and memory phenomenon – S Sahu, S K Majee and A J Pal, Appl. Phys. Lett., 91, 143108 (2007) IACS ANNUAL REPORT 2007-08  165

80. Rectifying Junctions from an Assembly of Two Dissimilar Nanoparticles – K Mohanta and A J Pal, J. Phys. Chem. C, 112, 3232 (2008)

81. Multi-functionality of Organic Devices: Light-emission, Photovoltage Generation, and Photodetection – S Sahu and A J Pal, J. Phys. Chem. C, 112, 8446 (2008)

82. Conductance Switching in an Organic Material: From Bulk to Monolayer – A K Rath and A J Pal, Langmuir, 23, 9831 (2007)

83. (Organic) Switching phenomenon in lateral structures: tuning by gate voltage – B Mukherjee and A J Pal, Org. Elec., 8, 584 (2007)

84. Switching between different conformers of a molecule: Multilevel memory elements – B C Das and A J Pal, Org. Elec., 9, 39 (2008)

85. Electrical Bistability in Zinc Oxide Nanoparticle-Polymer Composites – B Pradhan, S K Majee, S K Batabyal, and A J Pal, J. Nanosci. Nanotechnol., 7, 4534 (2007)

86. Particle size dependent exchange bias and cluster-glass states in LaMn0.7Fe0.3O3 – M Thakur, M Patra, S Majumdar, and S Giri, J. Phys.: Condensed Matter, 20, 195215 (2008)

87. Dominant dipolar interaction and glassy magnetic behaviour in the polymer coated magnetite nanoparticles – M Thakur, M Chowdhury, S Majumdar, and S Giri, Nanotechnology, 19, 045706 (2008)

88. Exchange bias with Fe substitution in LaMnO3 – M Patra, K De, S Majumdar and S Giri, Eur. Phys. J. B, 58, 367 (2007)

89. Magnetic and electrical transport properties of La0.87Mn1-xFexO3 (0 = x = 0.15): Coexistence of ferromagnetic and glassy magnetic states – K De, S Majumdar and S Giri, J. Phys. D: Appl. Phys., 40, 5810 (2007)

90. Spin-glass like features in cluster-glass compounds La1-dMn0.7Fe0.3O3 – K De, M Patra, S Majumdar, and S Giri, J. Phys. D: Appl. Phys., 40, 7614 (2007)

91. Electrical and ultraviolet photoresponse properties of quasi-aligned ZnO nanowires/p-Si heterojunction – R Ghosh, and D Basak, Appl. Phys. Lett., 90, 243106 (2007)

92. Self-seeded growth and ultraviolet photoresponse properties of ZnO nanowire arrays – R Ghosh, M Dutta and D Basak, Appl. Phys. Lett., 91, 073108 (2007)

93. Aluminium doped ZnO films: electrical, optical and photoresponse studies – S Mridha and D Basak, J. Phys. D: Appl. Phys., 40, 6902 (2007)

94. Composition dependent ultraviolet photoresponse in MgxZn1-xO thin films – R Ghosh and D Basak, J. Appl. Phys., 101, 113111 (2007)

95. Ultraviolet and visible photoresponse properties of n-ZnO/p-Si heterojunction – S Mridha and D Basak, J. Appl. Phys., 101, 083102 (2007)

96. Optical studies on MgxZn1-xO wide band gap semiconductor in the perspective of phase equilibrium – R Ghosh and D Basak, J. Mat. Sci.: Mater.Eelectron., 18, S141 (2007)

97. Growth of nano- and micro- structured GaN in bulk powder and on substrate – R Ghosh and D Basak, Phys. Stat. Solidi., 204, 3256 (2007) 166  IACS ANNUAL REPORT 2007-08

98. Ultraviolet Photodetection Properties of a Pt Contact on a Mg0.1Zn0.9O/ZnO Composite Film – S Mridha, R Ghosh and D Basak, J. Electron. Mater., 36, 1643 (2007)

99. Effect sol concentration on the properties of ZnO thin films prepared by sol-gel technique – M Dutta, S Mridha, and D Basak, Appl. Suf. Sci., 254, 2743 (2008)

100. Bias-Dependent Ultraviolet Photodetection by Au-Mg0.1Zn0.9O/ZnO-Ag Structure – S Mridha, R Ghosh and D Basak, J. Electron. Mater., 36, 524 (2007)

101. Magnetic properties and electronic structure of S=1/2 spin gap compound BaCu2V2O8 – S Salunke, A V Mahajan, and I Dasgupta, Phys. Rev. B, 77, 012410 (2008)

Spectroscopy

102. Exotic affinities under Debye plasma – S Bhattacharyya, A N Sil, T K Mukherjee and P K Mukherjee, Phys. Plasmas, 14, 024503 (2007)

103. Spectral line shift of alkali atoms in liquid helium: A relativistic density functional approach – J Anton, P K Mukherjee, B Fricke and S Fritzsche, J. Phys. B, At. Mol. Opt. Phys, 40, 2453 (2007)

104. Spectroscopy of Sodium atom in liquid helium cluster: A symmetry adopted cluster- configuration interaction (SAC-CI) study – B Saha, R Fukuda, H Nakatsuji and P K Mukherjee, Theor. Chem. Acc., 118, 437 (2007)

105. Atomic structure under external confinements: Effect of plasma – A N Sil, S Bhattacharyya and P K Mukherjee, Int. J. Quantum. Chem., 107, 2708 (2007)

106. Effect of Strongly Coupled Plasma on the Spectra of Hydrogenlike Carbon, Aluminium and Argon – S Bhattacharyya, A N Sil, S Fritzsche, P K Mukherjee, Eur. Phys. J., D46, 1 (2007)

107. The influence of Debye plasma on the ground state energies of exotic systems – A N Sil, P Mariusz, P K Mukherjee and M Bylicki, JQSRT, 109, 873 (2008)

108. vibrational effects on the dynamic electric properties of hydrogen peroxide – E Santiago, M A Castro, T L Fonseca and P K Mukherjee, J.Chem.Phys., 128, 064310 (2008)

109. Modulation of photophysics of 2-Hydroxy 1-naphthaldehyde in non-ionic Micelles - T Adhikary, P Chowdhury and S Chakravorti, Chem. Phys. Letts., 442, 504 (2007)

110. Ground state properties and elementary excitation of 85Rb Bose-Einstein condensate : analytical method for modified Thomas-Fermi model with large gas-parameter – M Gupta and K Rai Dastidar, J. Phys. Conf. Series, 80, 012038 (2007)

111. Control over group velocity in a three-level closed ? system via spontaneously generated coherence and dynamically induced coherence – S Dutta and K Rai Dastidar, Journal of Physics B, 40, 4287 (2007)

112. Control of probe response and dispersion in a three level closed ? system : Interplay between Spontaneously Generated Coherence and Dynamically Induced Coherence – S Dutta and K Rai Dastidar, Journal of Physics: Conference Series, 80, 012030 (2007)

113. Control of interference of molecular wavepacket and its dynamics by using delayed ultrafast phase-locked pulses – A Bhattacharjee and K Rai Dastidar, J. of Phys.: Conf. Series, 80, 12028 (2007) IACS ANNUAL REPORT 2007-08  167

114. Photophysical properties of 4-methyl 3-phenyl coumarin organized in Langmuir- Blodgett films: Formation of aggregates – S Acharya, T Kamilya, J Sarkar, T K Parichha, P Pal and G B Talapatra, MaterialsChemistry and Physics, 104, 88 (2007)

115. Interaction and Incorporation of Ovalbumin with Stearic Acid monolayer: Langmuir-Blodgett film formation and deposition – T Kamilya, P Pal and G B Talapatra, Colloids and Surfaces B Biointerfaces, 58, 137 (2007)

116. Incorporation of Ovalbumin within cationic Octadecylamine monolayer and a comparative study with zwitterionic DPPC and anionic Stearic acid monolayer – T Kamilya, P Pal and G B Talapatra, Journal of Colloid and Interface Science, 315, 464 (2007)

117. Adsorption of 4-Methyl-4H-1, 2, 4-Triazole-3-Thiol molecules on silver nano colloids: FT-IR, Raman and Surface-enhanced Raman Scattering study aided by Density functional theory – J Sarkar, J Chowdhury and G B Talapatra, J. Phys. Chem. C, 111, 10049 (2007)

118. Concentration dependent orientational changes of 2-Amino-2-thiazoline molecule adsorbed on silver nano colloidal surface investigated by SERS and DFT – J Chowdhury,J Sarkar, T Tanaka and G B Talapatra, J. Phys. Chem. C, 112, 227 (2008)

119. Spectroscopic Properties and Photophysics of a synthesized compound, 5-nitro benzo[b] thiophene-2-carboxylic acid, in non-polar/polar media and presence of TiO2 nanoparticles – P Mandal, T Sahu, T K Pradhan, S Karan, B Mallik, A K De, A De, T Ganguly, J. Luminescence, 127, 541 (2007)

120. Synthesis and trans-cis isomerization of azobenzene dendrimers incorporating 1,2- isopropylidenefuranose ring – A Ray, S Bhattacharya, S Ghorai, T Ganguly, A Bhattacharjya, Tetrahedron Lett., 48, 8078 (2007)

121. Effects of liquid crystal environment on the spectroscopic and photophysical properties of well known reacting systems 2,3-Dimethylindole (DMI) and 9-Cyanoanthracene (9CNA) – P Mandal, S Kundu, T Misra, S K Roy, T Ganguly J. Phys Chem. A, 111, 11480 (2007)

122. Does bimolecular charge recombination in highly exergonic electron transfer afford the triplet excited state or the ground state of a photosensitizer? – M Murakami, K Ohkubo, P Mandal, T Ganguly, S Fukuzumi, J. Phys Chem. A, 112, 643 (2008)

123. Photoinduced electron transfer dynamics in Porphyrin donor dyads – J A Hutchison,T D M Bell, T Ganguly, K P Ghiggino, S J Langford, N R Loken, M N Paddon-Row, J. Photochem Photobiol., A: Chemistry, 197, 220 (2008)

124. Combined directed ortho-metalation, remote-metalation and stille cross-coupling strategies. Concise stereoselective synthesis of polysubstituted 9H-fluoren-9-ones A – S Castanet, D Tilly, J B Veron, S S Samanta, A De, T Ganguly and J Mortier, Tetrahedron, 64, 3331 (2008)

125. Electro- optical properties of an orthoconic liquid crystal mixture (w-182) and its molecular dynamics – P Nayek, S Kundu, S K Roy, T Pal Majumder, N Bennis, J M Oton, and R Dabrowski, Journal of Applied Physics, 103, 054103 (2008)

126. Electro-optic and dielectric behaviour of a FLC material having doped with a non-mesogenic polar molecules – S Kundu, T Datta (nee Ray), P Nayek, T Pal Majumder, S K Roy, Current Applied Physics, 8, 542 (2008) 168  IACS ANNUAL REPORT 2007-08

127. Macroscopic Properties and Their Temperature Dependence of the Mesogen-4-butyl cyclohexyl- 4(4-propyl cyclohexyl) benzoate – S Chakraborty, A Mukhopadhaya, and S K Roy, Mol. cryst. Liq. Cryst., 482, 21 (2008)

128. Effects of annealing on the morphology and optical property of copper (II) phthalocyanine nanostructured thin films – S Karan and B Mallik, Solid State Communications, 143, 289 (2007)

129. Structural property of nanoporous silicon: evidence of near ultraviolet photoluminescence – A Kanjilal, M Song, K Furuya and B Mallik , J. Phys. : Appl. Phys., 40, 5044 (2007)

130. Two-dimensional coordination compound: A zinc ion-selective luminescent probe for biological applications – K Dhara, S Karan, J Ratha, P Roy, G Chandra, M Manassero, B Mallik and P Banerjee, Chemistry : An Asian Journal, 2, 1091 (2007)

131. Tunable visible-light emission from CdS nanocrystallites prepared under microwave irradiation – S Karan and B Mallik, J. Phys. Chem., C111, 16734 (2007)

132. Nanoflowers Grown From Phthalocyanine Seeds: Organic Nanorectifiers – S Karan and B Mallik, J. Phys. Chem., C112, (2008)

133. Spectroscopy of RgCl- (Rg=He, Ne, Ar, Kr) van der Waals molecules – N C Bera, A K Das, Mol. Phys., 105, 1433 (2007)

134. Ab initio study of spectroscopic properties of CuAr, CuAr+ and CuAr- - N C Bera, I Bhattacharyya, A K Das, Spectrochimica Acta, A67, 894 (2007)

135. Stability, structural properties and dissociation pathways of silylidyne-amines RSiNand silylidyne-phosphanes RSiP (R=F,Cl) – I Bhattacharyya, N C Bera, A K Das, Int. J. Quantum Chem., 108, 447 (2008)

Theoretical Physics

136. Effect of non-denumerable fixed points in finite dynamical systems – J K Bhattacharjee and S Chakraborty, Chaos, 18, 013124 (2008)

137. Energy levels of a particle confined in a supercritical box – J K Bhattacharjee, N Bera, S Mitra and S P Khastagir, Eur. Phys. J., D46, 41 (2008)

138. On the sign of the second-order energy shift in Rayleigh-Schrodinger perturbation theory for a highly excited state – J K Bhattacharjee, N Bera, K Bhattacharyya, J. Phys. A: Mathematical and Theoretical, 41, 045301(2008)

139. Perturbative and nonperturbative studies with the delta function potential – J K Bhattacharjee, N Bera, K Bhattacharyya, Am. J. Phys., 76 (3), 250 (2008)

140. Global persistence exponents in critical dynamics : finite size induced crossover – J K Bhattacharjee and D Chakraborty, Phys. Rev., E 76, 031117 (2007)

141. Acoustic perturbations on steady spherical accretion in Schwarzschild geometry – J K Bhattacharjee, T Naskar, N Chakrabarty and A K Ray, Phys. Rev., D 76, 123002 (2007)

142. Third-order structure factor for rotating three-dimensional homogeneous turbulent flow – J K bhattacharjee and S Chakraborty, Phys. Rev., E 76, 036304 (2007) IACS ANNUAL REPORT 2007-08  169

143. Asymmetry of the work probality distribution – J K Bhattacharjee and A Saha, J. Phys., A40, 13269 (2007)

144. Secular instability in quasi-viscous disc accretion – J K Bhattacharjee and A K Ray, Astrophys. Journal, 668, 409 (2007)

145. Nonlinear oscillators-a pedagogic review – J K Bhattacharjee, S Chakraborty and A K Mallik, Ind. J. Phys., (special issue) (2007)

146. Standing and traveling waves in the shallow-water circular hydraulic jump – J K Bhattacharjee and A K Ray, Phys. Lett., A 371, 241 (2007)

147. Bose-Einstein condensation and Casimir effect for ideal Bose Gas confined between two slabs – S Biswas, J. Phys. A: Math Theor, 40, 9969 (2007)

148. More Accurate Theory for Bose-Einstein Condensation Fraction – S Biswas, Phys. Lett. A 372 1574 (2008)

149. Cold hydrogen-hydrogen scattering using CCA model – S Chakraborty, A Sen and A S Ghosh, EPJD, 45, 261 (2007)

150. S-wave resonances of positron-hydrogen system in Debye plasma atmosphere using complex coordinate rotaion model – S Chakraborty and Y K Ho, Phys Rev, A 77, 014502 (2008)

151. Identification and characterization of a tRNA decoding the rare AUA codon in Haloarcula marismortui – C Kohrer, G Shrinivasan, D Mandal, B Mallick, Z Ghosh, J Chakrabarti and U L Rajbhandary, RNA, 14, 117 (2008)

152. miRNomics – The bioinformatics of microRNA genes – Z Ghosh, J Chakrabarti and B Mallick, Biochem. & Biophys Res Commun, 363, 6 (2007)

153. Formation of negative hydrogen ion in positronium-hydrogen collisions – S Roy and C Sinha, EPJD, 47, 327 (2008)

154. Ionization of sodium by the impact of alpha particle – S Bhattacharya, K B Choudhury, N C Deb, C Sinha, K Ray and A Z Msezane, EPJD, 47, 335 (2008)

155. Constraining the Randall-Sundrum Modulus in the light of recent PVLAS data – D Maity, S Roy and S Sengupta, Phys Rev., D77, 015010 (2008)

156. Slowly rotating dilaton black hole in anti-de Sitter spacetime – T Ghosh and S Sengupta, Phys Rev., D76 , 087504 (2007)

157. A Critical analysis of Goldberger-Wise stabilization of the Randall-Sundrum braneworld scenario – A Dey, D Maity and S Sengupta, Phys. Rev., D75, 107901 (2007)

158. Generalization of the Randall-Sundrum warped braneworld model to higher dimensions – D Choudhury and S Sengupta, Phys Rev., D76 , 064030 (2007)

159. Supergravity can reconcile dark matter with lepton number violating neutrino masses – B Mukhopadhyay, S Sengupta & R Srikanth, Phys Rev., D76, 075001 (2007)

160. Bulk antisymmetric tensor fields in a Randall-Sundrum model – B Mukhopadhyaya, S Sen and S Sengupta, Phys. Rev., D76, 075001 (2007)

161. The Raychaudhuri equations : A Brief review (Invited article) – S Kar and S Sengupta, Pramana, 69, 49 (2007) 170  IACS ANNUAL REPORT 2007-08

162. Split supersymmetry and the role of a light fermion in a general supergravity theory – B Mukhopadhyaya and S Sengupta, Mod Phys Lett., A22, 1391 (2007)

163. Non-zero trilinear parameter in the mSUGRA model: Dark matter and collider signals at Tevatron and LHC – U Chattopadhyay, D Das, A Datta, S Poddar, Phys Rev., D76, 055008 (2007)

164. Ginzburg-Landau theory of noncentrosymmetric superconductors – S P Mukherjee and S S Mandal, Phys Rev., B77, 014513 (2008)

165. Branes in hearts with perverse sheaves – S Mukhopadhyay and K Ray, Indian J. Phys., 80 (11), 1109 (2006)

166. Forbidden territories in the string landscape – A Kumar, S Mukhopadhyay and K Ray, J High Energy Phys, 32, 0712 (2007)

Energy Research Unit

167. Structural and transport properties of nanocrystalline silicon thin films prepared at 54.24 MHz plasma excitation frequency – A Chowdhury, S Mukhopadhyay and S Ray, Journal of Crystal Growth, 304, 352 (2007)

168. Study of Medium-Range Order and Defects in Hydrogenated Protocrystalline Silicon Films Deposited by Radio Frequency Plasma Enhanced Chemical Vapor Deposition –R Goswami and S Ray, Jpn. J. Appl. Phys., Part 1, 46, 7188 (2007)

169. Solid phase crystallization of protocrystalline silicon films: Changes in structural and optical properties – R Goswami, B Chowdhury and S Ray, Thin Solid Films, 516, 2306 (2008)

170. Comparison of electrical, optical and structural properties of RF-Sputtered ZnO thin film deposited under different gas ambients – R Das, K Adhikary and S Ray, Jpn. J. Appl. Phys., 47, 1501 (2008)

171. Effect of p-layer properties on nanocrystalline absorber layer and thin film silicon solar cells – A Chowdhury, K Adhikary, S Mukhopadhyay and S Ray, Journal of Physics D, 41, 135104 (2008)

172. Effect of gas flow rates on PECVD deposited nanocrystalline silicon thin film and solar cell properties – A Chowdhury, S Mukhopadhyay and S Ray, Solar Energy Materials and Solar Cells, 92 (4), 385 (2008)

173. Comparison of electrical, optical and structural of RF-sputtered ZnO thin films deposited under different gas ambients – R Das, K Adhikary and S Ray, Jpn. J. Appl. Phys., 47, 1501 (2008)

174. Bi-dimensional model for a-Si:H p+-i-n+ photodiode – R Negru, Y Bonnassieux, P Chatterjee, The European Physical Journal Applied Physics, 37, 265 (2007)

175. The open-circuit voltage in micro-crystalline silicon solar cells of different degrees of crystallinity - M Nath, P Roca i Cabarrocas, E V Johnson, A Abramov and P Chatterjee, Thin Solid Films, 516, 6974 (2008)

176. Why does the open-circuit voltage in a micro-crystalline silicon PIN solar cell decrease with increasing crystalline volume fraction? – E V Johnson, M Nath, P Roca i Cabarrocas, A Abramov and P Chatterjee, J. Non-Crystalline solids, 354, 2455 (2008)

177. Criteria for improved open-circuit voltage in a-Si:H(N)/ c-Si(P) front heterojunction with intrinsic IACS ANNUAL REPORT 2007-08  171

thin layer solar cells - M Nath, P Chatterjee, J Damon-Lacoste and P Roca i Cabarrocas, J. Appl. Phys., 103, 034506 (2008)

178. High Diffusion Length Silicon Germanium Alloy Thin Films Deposited By Pulsed RfPECVD Method – P Chaudhuri, A Bhaduri, A Bandyopadhyay, S Vignoli, P P Ray, C Longeaud, Journal of Non-Crystalline Solids, 354, 2105 (2008)

179. Superior nanocrystalline silicon network at enhanced growth rate – D Das and K Bhattacharya, Jpn. J. Appl. Phys., 46, L1006 (2007)

180. Nanocrystalline silicon films prepared from silane plasma in RF-PECVD, using helium dilution without hydrogen: Structural and optical characterization – K Bhattacharya and D Das, Nanotechnology, 18 , 415704 (2007)

181. Hydrogen induced promotion of nanocrystallization from He-diluted SiH4 plasma – D Raha and D Das, J. Phys. D: Appl. Phys., 41, 085303 (2008)

MLS Professor’s Unit

182. Sol-Gel Synthesized SnO2 Nanoparticles and their Properties – S Das, S Basu, G Majumdar, D Chakravorty and S Chaudhuri, J. Nanoscience and Nanotechnology, 7, 1 (2007)

183. X-ray Photoelectron Spectroscopy Studies on Core-Shell Structured Nanocomposites – M Mukherjee, S Basu, B Ghosh and D Chakravorty, Appl. Surf. Science, 253, 8463 (2007)

184. Resistivity Hysteresis of Ag2S Nanocomposites – S Banerjee, S Bhattacharya and D Chakravorty, J. Phys. Chem. C, 111, 13410 (2007)

185. Electrical and Magnetic Properties of Cold-Compacted Iron-Doped Zinc Sulfide Nanoparticles Synthesized by Wet Chemical Method – S Bhattacharya and D Chakravorty, Chem. Phys. Lett., 444, 319 (2007)

186. Laser – induced Forward Transfer Technique for Maskless Patterning of Amorphous V2O5 Thin Film – S Chakravorty, H Sakata, E Yokoyama, M Wakaki and D Chakravorty, Appl. Surf. Science, 254, 638 (2007)

187. Development of Optical Nonlinearity, High Dielectric Constant and Ferromagnetric Behaviour in a Silicate Glass Nanocomposite by Suitable Heat Treatment – S Basu, V Gopalan, H Jain and D Chakravorty, J. Non-Cryst. Solids, 354, 3278 (2008)

Biological Chemistry

188. Albumin-quercetin combination offers a therapeutic advantage in the prevention of reduced survival of erythrocytes in visceral leishmaniasis – G Sen, D Biswas, M Ray and T Biswas., Blood Cells Mol Dis, 39(3), 245 (2007)

189. Quercetin interferes with iron metabolism in Leishmania donovani and targets ribonucleotide reductase to exert leishmanicidal activity – G Sen, S Mukhopadhyay, M Ray and T Biswas. Journal of Antimicrobial Chemotherapy, 61, 1066 (2008)

190. A brief critical overview on the biological effects of methylglyoxal and further evaluation of methylglyoxal-based anticancer formulation in treating cancer patients – D Talukdar, S Ray, M Ray and S Das, Drug Metabolism and Drug Interactions, 23, 175 (2008)

191. Biosorption of chromium by Termitomyces clypeatus – S K Das and A K Guha, Colloids Surf. 172  IACS ANNUAL REPORT 2007-08

B: Biointerfaces, 60, 46 (2007)

192. A study on the adsorption mechanism of Mercury on Aspergillus versicolor biomass – S K Das and A K Guha. Environ. Sci. Technol, 41, 8281 (2007)

193. Enhancement of growth and chitosan production by Rhizopus oryzae in whey medium by plant growth hormones – S Chatterjee, S Chatterjee, B P Chatterjee and A K Guha, Int. J. Biol. Macromol, 42, 120 (2008)

194. Biosorption of cadmium and nickel by functionalized husk of Lathyrus sativus – G C Panda, S K Das and A K Guha Colloids Surf. B: Biointerfaces, 62, 173 (2008)

195. Nonionic Surfactants: A Key to Enhance the Enzyme Activity at Cationic Reverse Micellar Interface – A Shome, S Roy and P K Das, Langmuir, 23, 4130 (2007)

196. Probing the Relationship Between Interfacial Concentrations and Lipase Activity in Cationic W/O Microemulsions: A Quantitative Study by Chemical Trapping – A Dasgupta, D Das and P K Das, Langmuir, 23, 4137 (2007)

197. Alkyl Chain Length Dependent Hydrogelation of L-Tryptophan Based Amphiphile – S Roy, A Dasgupta and P K Das, Langmuir, 23, 11769 (2007)

198. Structure and Properties of Low Molecular Weight Amphiphilic Peptide Hydrogelators – R N Mitra, D Das, S Roy and P K Das. J. Phys. Chem. B, 111, 14107 (2007)

199. Unsaturation at the surfactant head: Influence on the activity of lipase and horseradish peroxdiase in reverse micelles – S Debnath, D Das and P K Das, Biochem Biophys. Res. Commun., 356, 163 (2007)

200. Improved activity of horseradish peroxidase (HRP) in ‘specifically designed’ ionic liquid – D Das, A Dasgupta and P K Das, Tetrahedron Lett., 48, 5635 (2007)

201. Effect of headgroup on DNA-cationic surfactant interactions – A Dasgupta, P K Das, R S Dias, M G Miguel, B Lindman, V M Jadhav, M Gnanamani and S Maiti, J. Phys Chem. B, 111, 8502 (2007)

202. Ordering of binary polymeric nanoparticles on hydrophobic surfaces assembled from low volume fraction dispersions – R Mukhopadhyay, O Al-Hanbali, S Pillai, A G Hemmersam, R L Meyer, A C Hunter, K J Rutt, F Besenbacher, S M Moghimi and P Kingshott, Journal of the American Chemical Society, 129, 13390 (2007)

Inorganic Chemistry

203. Supramolecular isomerism in coordination polymers of isophthalato bridged Mn(II) complexes with 4,4’-dipyridyl N,N’-dioxide ¾ S C Manna, E Zangrando, J Ribas and N Ray Chaudhuri, Eur. J. Inorg. Chem., 1400 (2008)

204. Pyridine 2, 6-dicarboxylate dianion: a suitable ligand for designing dinuclear Cu(II) complexes – S C Manna, E Zangrando and N Ray Chaudhuri J. Mol. Struct., 877, 145 (2008)

205. 2D parallel interpenetrated [M2(bpp)4X2] [ M, Fe(II) / Co(II); bpp, 4,4¢-trimethylenedipyridine;

X, SCN¯, SeCN¯ and N3¯ ] complexes: pseudohalide dependent conformation of bpp – S C Manna, A D Jana, G M Rosair, G Mostafa and N Ray Chaudhuri, J. Solid State Chem., 181, 457 (2008) IACS ANNUAL REPORT 2007-08  173

206. Polymorphism in [Co(SCN)4(ppz-H)2] (ppz, piperazine) – S C Manna, A D Jana, G M Rosair, M G B Drew, G Mostafa and N Ray Chaudhuri, Polyhedron, 27, 1280 (2008) 207. Dipyridyl bridged coordination polymer of Cu(II): synthesis, crystal structure and magnetic study – S C Manna, J Ribas, E Zangrando and N Ray Chaudhuri, Polyhedron, 26, 4923 (2007) 208. Construction of a 3D supramolecular network of cobalt(II)(bis(4-pyridyl)ethylene) with terephthalate dianions – S C Manna, E Zangrando, J Ribas and N Ray Chaudhuri, Inorg. Chem. Acta, 361, 411 (2008) 209. Synthesis, crystal structure and thermal analysis of supramolecular architectures of copper (II) (2,2´-biimidazole)complex using dicarboxylate as a coligand – A K Ghosh, D Ghosal, E Zangrando and N Ray Chaudhuri, Polyhedron, 26, 4195 (2007) 210. Self-assembled 1D water cluster in a supramolecular architecture of Co(II)(tartrate) (phenanthroline/bipyridine): an assessment of magnetic property – S C Manna, E Zangrando, J Ribas and N Ray Chaudhuri, Eur. J. Inorg. Chem., 4592 (2007) 211. 4,4’-Dipyridyl-N,N’-dioxide complexes of metal-thiocyanate / selenocyanate: ??stacked molecular rod as 3D support for 2D polymeric sheets and intra /inter chain S-S interaction 2 dependent architecture of R2 (8) synthon driven assembly of 1D polymeric chains – A D Jana, S C Manna, G M Rosair, M G B Drew, G Mostafa and N Ray Chaudhuri, Cryst. Growth Des., 7, 1365 (2007) 212. Towards rational design of supramolecular helices using linear pseudohalides in Cd(II) - 2,2´-biimidazole system – A D Jana, A K Ghosh, D Ghoshal, G Mostafa and N Ray Chaudhuri, CrystEngComm., 9, 304 (2007) 213. Syntheses, crystal structures and magnetic properties of metal-organic hybrid materials of Cu(II): effect of a long chain dicarboxylate backbone, and counteranion in their structural diversity – A K Ghosh, D Ghoshal, E Zangrando, J Ribas and N Ray Chaudhuri, Inorg. Chem., 46, 3057 (2007) 214. Cobalt(II)-(dpyo)-dicarboxylate networks: unique H-bonded assembly and rare bridging mode of dpyo in one of them [dpyo, 4,4’-dipyridyl N,N’-dioxide] – S C Manna, E Zangrando, J Ribas and N Ray Chaudhuri, Dalton Trans., 1383 (2007)

2- 215. Hetero-metallic frameworks of [Pd(CN)4] and Cu(II) with triamines: a rare example of tetracyanometallate bridged 2D coordination polymer – S C Manna, J Ribas, E Zangrando and N Ray Chaudhuri, Polyhedron, 26, 3189 (2007) 216. Halogen exchange and scrambling between C-X and M-X´ bonds in copper, nickel, and cobalt complexes of 6,6´-bis(bromo/chloromethyl)-2,2´-bipyridine. Structural, electrochemical, and photochemical studies – M Ghosh, P Biswas, U Flörke, K Nag, Inorg. Chem., 47, 281 (2008) 217. Structural, spectroscopic and redox properties of transition metal complexes of dipyrido[3,2- f.2´,3´-h] quinoxaline – M Ghosh, P Biswas, U Flörke, Polyhedron, 26, 3750 (2007) 218. Synthesis, crystal and molecular structure of coordination polymers constructed by self-assembly

of NiN4 cores with 2,2´-iminodibenzoate and nitroprusside ions – J Chakraborty, N Shaikh, H Mayer-Figge, W S Sheldrick, P Vojtîsek, P Banerjee, Struct. Chem., 18, 157 (2007) 219. Synthesis, crystal structures and properties of two Pd(II) and Pt(II) complexes involving

3,5-diphenylpyrazole and NO2 donor ligands – J Chakraborty, M K Saha, P Banerjee, Inorg. Chem. Commun., 10, 671 (2007) 174  IACS ANNUAL REPORT 2007-08

220. Synthesis, crystal structures and magnetic properties of three Ni(II) complexes having NiN4 core with argentocyanide, terephthalate and dicyanamide ions : From discrete molecule to a helical network – J Chakraborty, P Ray, H Mayer-Figge, W S Sheldrick, P Banerjee, Polyhedron, 26, 3609 (2007)

221. Synthesis, crystal structure, magnetic property and DNA cleavage activity of a new terephthalate- bridged tetranuclear copper(II) complex – K Dhara, P Roy, J Ratha, M Manassero, P Banerjee, Polyhedron, 26, 4509 (2007)

222. Enhanced emission from single component organic core-shell nanoparticles – K Dhara, K Sarkar, P Roy, A Bhaumik, P Banerjee, J. Nanosci. Nanotechnol., b, 4311 (2007)

223. Nickel complexes with N2O donor ligands : syntheses, structures, catalysis and magnetic study – J Chakraborty, M Nandi, H Mayer-Figge, W S Sheldrick, L Sorace, A Bhaumik, P Banerjee, Eur. J. Inorg. Chem., 32, 5005 (2007)

224. A two-dimensional coordination compound as a zinc ion selective luminescent probe for biological applications – K Dhara, S Karan, J Ratha, P Roy, G Chandra M Manassero, B Mallik, P Banerjee, Chem. Asian J., 2, 1091 (2007)

225. Selective fluorescence zinc ion sensing and binding behavior of 4-methyl-2,6- bis(phenylmethyliminomethyl)phenol : biological application – P Roy, K Dhara, M Manassero, J Ratha, P Banerjee, Inorg. Chem., 46, 6405 (2007)

226. A highly enantioselective chiral Schiff-base fluorescent sensor for mandelic acid – K Dhara, K Sarkar, P Roy, M Nandi, A Bhaumik, P Banerjee, Tetrahedron, 64, 3153 (2008)

227. Targeted synthesis of m-oxo divanadium(V) compounds with asymmetry in coordination environments – P B Chatterjee, N Kundu, S Bhattacharya, K-Y Choi, A Endo and M Chaudhury, Inorg. Chem., 46, 5483 (2007)

228. Cis-dioxomolybdenum(VI) complexes of sterically encumbered phenol-based tetradentate

N2O2 ligands : structural, spectroscopic, and electrochemical studies – D Mandal, R Ganguly, P B Chatterjee, A Endo, T J R Weakley and M Chaudhury, Struct. Chem., 18, 187 (2007)

229. Tetra- and dinuclear nickel(II)-vanadium(IV/V) heterometal complexes of a phenol-based N2O2 ligand : synthesis, structures, magnetic and redox properties – D Mandal, P B Chatterjee, R Ganguly, E R T Tiekink, R Clérac and M Chaudhury, Inorg. Chem., 47, 548 (2008)

230. Estimation of the van der Waals radii of the d-block elements using the concept of bond valence – S Nag, K Banerjee, D. Datta, New J. Chem., 31, 832 (2007)

231. Square planar mononuclear Pd(II) complexes of substituted 2-(pyrazole-1-yl)phenyl-amines with a helical twist – M G B Drew, A Mukherjee, S De, S. Nag, D. Datta, Inorg. Chim. Acta, 360, 3448 (2007)

232. A hexadecanuclear copper(I)-copper(II) mixed-valence compound. Structure, magnetic properties, intervalence charge transfer, epr and nmr – S De, S Chowdhury, J P Naskar, M G B Drew, R Clérac, D Datta, Eur. J. Inorg. Chem., 3695 (2007)

233. A monoaqua zinc complex. Unique acid dissociation behaviour – M G B Drew, D Parui, S De, S Chowdhury, D. Datta, New J. Chem., 31, 1763 (2007)

234. Effect of the size of discrete anions on the nuclearity of a complex cation – G K Patra, I Goldberg, S De, D Datta, Cryst. Eng. Comm, 9, 828 (2007) IACS ANNUAL REPORT 2007-08  175

235. X¯H···Y (X, Y = N, O) hydrogen bonds. A new bond valence sum analysis – K Banerjee, S De, D Datta, J. Chem. Crystallogr., 37, 675 (2007)

236. Determination of acid dissociation constants of some monobasic organic acids in acetonitrile from molar conductance – S Nag, D Datta, Indian J. Chem., 46A, 1263 (2007)

237. Acid dissociation of 2,2¢-dipyridylamine in non-aqueous medium when chelated to some

Ru(II)N4 cores – M G B Drew, S Nag, D Datta, Inorg. Chim. Acta, 361, 417 (2008)

238. Use of HNO3 as the source of NO to prepare a nitric oxide complex of ruthenium – M G B Drew, S Nag, D. Datta, Dalton Trans., 2298 (2008)

239. Isolation of a Manganese Complex of a Tridentate Azo-aromatic Ligand from an Unusual

Mn2(CO)10 Promoted Simultaneous Reductive Azo Cleavage and Aromatic Ring Amination Reactions – S Chatterjee, A Sanyal, C-H Hung, S Goswami, Z. Anorg. Allg. Chem., 633, 1775 (2007)

240. Singlet Diradical Complexes of Chromium, Molybdenum and Tungsten with Azo Anion Radical

Ligands from M(CO)6 Precursors – A Sanyal, S Chatterjee, A Castiñeiras, B Sarkar, P Singh, J Fiedler, S Záliš, W Kaim, S Goswami, Inorg. Chem., 46, 8584 (2007)

241. Organization of the Ru2Na Moiety of a Phenazine Ligand into a New Coordination Network Promoted by ClO4–Aromatic-ð- Interactions – P Banerjee, A D Jana, G Mostafa, S Goswami, Eur. J. Inorg. Chem., 44, (2008)

242. Singlet Diradical Complexes of Ruthenium and Osmium: Geometrical and Electronic Structures and their Unexpected Changes on Oxidation - S Samanta, P Singh, J Fiedler, S Záliš, W Kaim, S. Goswami, Inorg. Chem., 47, 1625 (2008)

243. Mild Synthesis of a Family of Planar Triazinium Cations via Proton Assisted Cyclization of Pyridyl Containing Azo Compounds and Studies on DNA Intercalation – M Sinan, M Panda, A Ghosh, K Dhara, P E Fanwick, D J Chattopadhyay, S. Goswami, J. Am. Chem. Soc., 130, 5185 (2008)

244. Synthesis and X-ray Crystallographic Investigation of a Novel Indole Based Cryptand: Structure of a Sandwich Cyclic S6 Hexameric Methanol – M Arunachalam, E Suresh, P Ghosh, Tetrahedron Lett., 48, 2909 (2007)

245. Encapsulation of Halides within the Cavity of a Pentafluorophenyl-Substituted Tripodal Amine Receptor – P S Lakshminarayanan, I Ravikumar, E Suresh P. Ghosh, Inorganic Chemistry, 46, 4769 (2007)

246. Hexabromide salt of a tiny octaazacryptand as a receptor for encapsulation of lower homolog halides: Structural evidence on halide selectivity inside the tiny cage – M Arunachalam, E Suresh and P Ghosh, Tetrahedron, 63, 11371 (2007)

247. Attachment of 4-methoxy benzyl units to a tripodal fluoroionophore shows reversal of output functionality with Cu(II) input - I Ravikumar, B N Ahamed and P Ghosh, Tetrahedron, 63, 12940 (2007)

248. Trapped inorganic phosphate dimer – P S Lakshminarayanan, I Ravikumar, E Suresh and P Ghosh, Chem. Commun., 5214 (2007)

249. X-Ray Crystallographic Investigations of an Azacryptand and its Bis-Protonated Salt: Interactions of Acyclic Water Trimer and C-H…ð Interactions in T-shaped Benzene Dimer – P S Lakshminarayanan, D K Kumar, I Ravikumar, B Ganguly and P Ghosh, Synt. React. Inorg. 176  IACS ANNUAL REPORT 2007-08

Metal-Org. Nano Metal Chem., 38, 2 (2008)

250. Chemical Sensing of Ions and Its Clinical Applications – I Ravikumar, P S Lakshminarayanan, B N Ahamed and P Ghosh, Asian J. Exp. Sci., 22 (2), 104 (2008)

Organic Chemistry

251. An Alternative Method for the Regio- and Stereoselective Bromination of Alkenes, Alkynes, Toluene Derivatives and Ketones Using a Bromide.Bromate Couple – S Adimurthy, S Ghosh, P U Patoliya, G Ramachandraiah, M Agarwal, M R Gandhi, S C Upadhyay, P Ghosh and B C Ranu, Green Chemistry, 10, 232 (2008)

252. Catalysis by Ionic Liquid. Significant Rate Acceleration Using [pmIm]Br in the Three-Component Synthesis of Dithiocarbamates – B C Ranu, A Saha and S Banerjee, Eur. J. Org. Chem., 519 (2008)

253. Green Chemistry for Clean Environment and Healthy Life – B C Ranu, J. Inst. Chem., 80, 65 (2008)

254. Potential of Metal Nanoparticles in Organic Reactions – B C Ranu, K Chattopadhyay, A Saha, L Adak, R Jana, S Bhadra, R Dey, and D Saha, J. Phys.: Conference Series, 106, 012003 (2008)

255. Solvent Controlled Highly Selective Bis- and Mono-allylation of Active Methylene Compounds by Allyl Acetate Using Palladium(0) Nanoparticle – B C Ranu, K Chattopadhyay and L Adak, Org. Lett., 9, 4595 (2007)

256. Microwave Assisted Simple and Efficient Ligand Free Copper Nanoparticle Catalyzed Aryl-Sulfur Bond Formation – B C Ranu, A Saha and R Jana, Adv. Synth. Catal., 349, 2690 (2007)

257. Regioselective Cross-coupling of Allylindium Reagents with Activated Benzylic Bromides – A Simple and Efficient Procedure for the Synthesis of Terminal Alkynes – B C Ranu, S Banerjee and L Adak, Tetrahedron Lett., 48, 7374 (2007)

258. A New Route to the Synthesis of (E)- and (Z)-2-Alkene-4-yne-oates and Nitriles from vicinal-Diiodo-(E)-Alkenes Catalyzed by Pd(0) Nanoparticles in Water – B C Ranu and K Chattopadhyay, Org. Lett., 9, 2409 (2007)

259. Efficient Regio- and Stereo-selective Cleavage of Aziridines and Epoxides using an Ionic Liquid as Reagent and Reaction Medium – B C Ranu, L Adak and S Banerjee, Can. J. Chem., 85, 366 (2007)

260. Chemo-, Regio-, and Stereoselective Addition of Triorganoindium Reagents to Acetates of Baylis-Hillman Adducts: A New Stategy for the Synthesis of (E)- and (Z)-Trisubstituted Alkenes – B C Ranu, K Chattopadhyay and R Jana, Tetrahedron Lett., 48, 3847 (2007)

261. Halogenation of Carbonyl Compounds by Ionic Liquid, [AcMIm]X and Ceric Ammonium Nitrate (CAN) – B C Ranu, L Adak and S Banerjee, Aust. J. Chem., 60, 358 (2007)

262. Ionic Liquid Promoted Regio- and Stereo-Selective Thiolysis of Epoxides – A Simple and Green Approach to â-Hydroxy and â-Keto Sulfides – B C Ranu, T Mandal and S Banerjee, Aust. J. Chem., 60, 278 (2007)

263. An Improved Procedure for the Three-Component Synthesis of Highly Substituted Pyridines Using Ionic Liquid – B C Ranu, R Jana and S Sowmiah, J. Org. Chem., 72, 3152 (2007) IACS ANNUAL REPORT 2007-08  177

264. An Efficient Synthesis of â-Alkyl/arylsulfanyl Carbonyl Compounds by In-TMSCl Promoted Cleavage of Dialkyl/Diaryl Disulfides and Subsequent Michael Addition – B C Ranu and T Mandal, Synth. Commun., 37, 1517 (2007)

265. Ionic Liquid Promoted Stereoselective Synthesis of (Z)-Vinyl Bromides by [bmIm]OH under Organic Solvent Free Conditions - A Green Approach – B C Ranu, S Banerjee and J Gupta, Synth. Commun., 37, 2869 (2007)

266. A Simple, Efficient and Green Procedure for 1,4-Addition of Thiols to Conjugated Alkenes and Alkynes Catalyzed by Sodium Acetate in Aqueous Medium – B C Ranu and T Mandal, Aust. J. Chem., 60, 223 (2007)

267. Bargellini condensation of coumarins. Expeditious route to o-carboxyvinylphenoxy-isobutyric acids and application to the synthesis of sesquiterpenes helianane, heliannuol A and heliannuol C – B Biswas, P K Sen and R V Venkateswaran, Tetrahedron, 63, 12026 (2007)

268. Total synthesis of heliannuol B, an allelochemical from Helianthus annus – A Roy, B Biswas, P K Sen and R V Venkateswaran, Tetrahedron Lett., 48, 6933 (2007)

269. Total synthesis of alboatrin, a phytotoxic metabolite from Vertcillium alboatrum – B Biswas, D Sarkar and R V Venkateswaran, Tetrahedron, 64, 3212 (2008)

270. Facile aromatic Claisen rearrangement catalysed by stannic chloride – D Sarkar and R V Venkateswaran, Synlett, 653 (2008)

271. Copper (I) Catalyzed [2+2] Photocycloaddition of Non-conjugated Alkenes in Room Temperature Ionic Liquids – C K Malik, M Vaultier and S Ghosh, Synthesis (special topic on copper in organic synthesis on invitation by Eric Carriera), 1247 (2007)

272. The First Total Synthesis of Sequosempervirin A through an Orthoester Claisen Rearrangement- Ring Closing Metathesis Sequence – S Maity and S Ghosh, Tetrahedron Lett., 48, 3355 (2007)

273. Domino Metathesis Involving ROM-RCM of Substituted Norbornenes. Rapid Access to Densely Functionalized Tricyclic Bridged and Condensed Ring Systems – C Malik and S Ghosh, Org. Lett., 9, 2537 (2007)

274. Convenient route to enantiopure substituted butyrolactones: application in a formal synthesis of both enantiomers of enterolactone – M Ghosh, Tetrahedron, 63, 11710 (2007)

275. A simple route to enantiopure bis-lactones: synthesis of both enantiomers of epi-nor- canadensolide, nor-canadensolide, and canadensolide – S Mondal and S Ghosh, Tetrahedron, 64, 2359 (2008)

276. Rapid assembly of the functionalized tricyclic core of umbellactal through domino metathesis involving ROM-RCM of a norbornene derivative – S Maity and S Ghosh, Tetrahedron Lett., 49, 1133 (2008)

277. Synthesis of bicyclo[3.2.1]octanones via ketyl radical promoted rearrangements under reductive PET condition – S Yadav, S Banerjee, D Maji and S Lahiri, Tetrahedron, 63, 10979 (2007)

278. Face-Selective Diels–Alder Reactions between Unsymmetrical Cyclohexadienes and Symmetric trans-Dienophile: An Experimental and Computational Investigation – S Lahiri, S Yadav, 178  IACS ANNUAL REPORT 2007-08

S Banerjee, M P Patil, and R B Sunoj, J. Org. Chem., 73, 435 (2008)

279. Synthesis of bis(indolyl)methanes in aqueous medium catalysed by molybdenyl acetylacetonate – B Banerjee, S K Mandal and S C Roy, Ind. J. Chem., 46B, 669 (2007)

280. Ce(IV) ammonium nitrate catalyzed chemoselective deprotection of acetonides – S Jana and S C Roy, Ind. J. Chem., 46B, 707 (2007)

281. Titanocene(III) chloride mediated radical-induced one pot synthesis of a-methylene-g- butyrolactones – M Paira, B Banerjee, S Jana, S K Mandal and S C Roy, Tetrahedron Lett., 48, 3205 (2007)

282. Radical-mediated novel synthesis of 3,4-dihydroisocoumarins: total synthesis of hydrangenol – S K Mandal and S C Roy, Tetrahedron Lett., 48, 4131 (2007). [Corrigendum: S K Mandal and S C Roy, Tetrahedron Lett., 48, 6225 (2007)]

283. Titanocene(III) Mediated Radical Cyclizations of Epoxides for the Synthesis of Medium-Sized Cyclic Ethers – S K Mandal and S C Roy, Tetrahedron, 63, 11341 (2007)

284. A carbohydrate-based synthesis of cis- and trans-fused bicyclic ethers by radical cyclization of epoxides using a transition-metal radical source – S Jana, C Guin and S C Roy, Ind. J. Chem., 46B, 1648 (2007)

285. Cerium(IV) ammonium nitrate catalyzed synthesis of a-dehydro-b-amino esters – M Paira, S K Mandal and S C Roy, Tetrahedron Lett., 49, 2432 (2008)

286. Convenient Synthesis of Palladium Nanoparticles and Catalysis of Hiyama Coupling Reaction in Water – D Srimani, S Sawoo and A Sarkar, Org. Lett., 9, 3639 (2007)

287. Crystal engineering approach towards the design of an organometallic gelator – P Sahoo, D Krishna Kumar, D R Trivedi and P Dastidar, Tetrahedron Lett., 49, 3052 (2008)

288. Ligating topology and counter anion controlled transformation from discrete metallo– macrocycle to 2D corrugated sheet in coordination compounds derived from a bis–pyridyl– bis–amide ligand and Cd(II) salts - N N Adarsh, D Krishna Kumar and P Dastidar, Inorg. Chem. Commun., 11, 636 (2008)

289. Isomerism in Coordination- Complexes and Polymers Derived from Bispyridylurea Ligands: Effect of Solvents, Conformational Flexibility and Positional Isomerism of the Ligands – D Krishna Kumar, A Das and P Dastidar, Crystal Growth & Design, 7, 2096 (2007)

290. Exploring Hydrogen bond Functionalized Backbone and Ligating Topologies in Co(II) Coordination Polymers of Mixed Ligand Systems: Conformation Dependent Network Structures and Entrapment of (H2O)14 Water Cluster of an Unprecedented Topology – D Krishna Kumar, A Das and P Dastidar, Cryst. Eng. Comm., 9, 895 (2007)

291. Metallo-porphyrin Based Inclusion Materials: Exploiting Ligating Topologies and Hydrogen Bonding Backbone in Generating New Supramolecular Architectures – D Krishna Kumar, A Das and P Dastidar, Inorg. Chem., 46, 7351 (2007)

292. Supramolecular Structural Diversities in the MOFs Derived from Pyridylamide Ligands: Studying the Effects of Ligating Topologies, Hydrogen Bonding Backbone of the Ligands and Counter Anions – D Krishna Kumar, A Das and P Dastidar, Cryst. Eng. Comm., 9, 548 (2007)

293. Remarkably Stable Porous Assembly of Close-ended Sticky Nanotubes Derived from a Simple IACS ANNUAL REPORT 2007-08  179

Metal-organic Framework – D Krishna Kumar, A Das and P Dastidar, Crystal Growth & Des., 7, 205 (2007)

294. Composites of N, N’–bis–(pyridyl) Urea–dicarobxlyic Acid as New Hydrogelators – A Crystal Engineering Approach – N N Adarsh, D Krishna Kumar and P Dastidar, Tetrahedron, 63, 7386 (2007)

Physical Chemistry

295. Ultrafast Proton Transfer of Pyranine in a Supramolecular Assembly: PEO-PPO-PEO Triblock Co-polymer and CTAC – S Ghosh, S Dey, A Adhikari, U Mandal, S K Mondal, K Bhattacharyya, J. Phys. Chem. B, 111, 13504 (2007)

296. Femtosecond Solvation Dynamics in a neat Ionic Liquid and Ionic Liquid Microemulsion: Excitation Wavelength Dependence – A Adhikari, K Sahu, S Dey, S Ghosh, U Mandal, K Bhattacharyya, J. Phys. Chem. B, 111, 12809 (2007)

297. Ultrafast FRET in the micelle and the gel phase of a PEO-PPO-PEO triblock copolymer: excitation wavelength dependence – S Ghosh, S Dey, A Adhikari, U Mandal, K Bhattacharyya, J. Phys. Chem. B, 111, 7085 (2007)

298. Excitation Wavelength Dependence of Solvation Dynamics in a gel. (PEO)20-(PPO)70–(PEO)20 tri- block copolymer – S Ghosh, A Adhikari, U Mandal, S Dey and K Bhattacharyya, J. Phys. Chem. C, 111, 8775 (2007)

299. Study of Organized and Biological Systems using an Ultrafast Laser – S Ghosh, S Dey, A Adhikari, U Mandal and K Bhattacharyya, Int. Rev. Phys. Chem., 26, 421 (2007)

300. Ultrafast Electron Transfer from Dimethyl aniline to Coumarin Dyes in SDS and TX-100 micelles – S Ghosh, S K Mondal, K Sahu and K Bhattacharyya, J. Chem. Phys., 126, 204708 (2007)

301. Excitation Wavelength Dependence of Solvation Dynamics in a Supramolecular Assembly: PEO-PPO-PEO Triblock Co-Polymer and SDS – U Mandal, A Adhikari, S Dey, S Ghosh, S K Mondal and K Bhattacharyya, J. Phys. Chem. B, 111, 5896 (2007)

302. Ultrafast Dynamics in Biological Systems and in Nano-Confined Environments – K Sahu, S K Mondal, S Ghosh K Bhattacharyya, Bull. Chem. Soc. Japan, 80, 1033 (2007)

303. On the origin of the anomalous ultraslow component of Solvation Dynamics in heterogeneous environments - K Bhattacharyya and B Bagchi, J. Chem. Sci., 119, 113 (2007)

304. Excited State Proton Transfer from Pyranine to Acetate in methanol – S K. Mondal, K Sahu, S Ghosh, P Sen and K Bhattacharyya, J. Chem. Sci., 119, 71 (2007)

305. Temperature dependent magnetic field effect study on exciplex luminescence: Probing the triton X -100 reverse micelle in cyclohexane – D Das and D N Nath, J. Phys.Chem. B, 111, 11009 (2007)

306. Identification of two conformers of 5-indole in a supersonic free jet – S Banerjee, S Chakraborty, P P Parui, D N Nath, T Chakraborty and M Chowdhury, Chem. Phys. Letts., 442, 21 (2007)

307. Photophysical properties of 2,3,6,7–tetrahydro–8–hydroxyl–1H,5H–benz[i,j]quinolizine –9–carboxaldehyde: Evidence of excited state intramolecular proton transfer but not of the intramolecular charge transfer process – S Mahanta, R B Singh, D Nath, N Guchhait, J. Photchem 180  IACS ANNUAL REPORT 2007-08

Photbiol A, 197, 62 (2008)

308. Laser Induced Fluorescence Spectroscopy of a Mixed Dimer between 2-Pyridone and 7-Azaindole – M K Hazra, A K Samanta, and T Chakraborty, J. Phys. Chem. A, 111, 7813 (2007)

309. Identification of two conformers of 5-indanol in a supersonic free jet – S Banerjee, S Chakraborty P P Parui, D N Nath, T Chakraborty and M Chowdhury, Chem. Phys. Lett., 442, 21 (2007)

310. Impact of Methyl Rotor in the Excited State Level Mixing of Doubly Hydrogen-Bonded Complexes of 2-Pyridone – M K Hazra and T Chakraborty, J. Phys. Chem. A, 112, 1100 (2008)

311. Dispersed fluorescence spectroscopy ofp -fluorophenol – P Biswas, P Pandey and T Chakraborty, Chem. Phys. Lett., 454, 163 (2008)

312. Laser induced fluorescence spectroscopy of jet cooled trans 1-methoxynaphthalene: A comparative study with trans 1-hydroxynapthalene – V Ramanathan, P Pandey and T Chakraborty, Chem. Phys. Lett., 456, 19 (2008)

313. Noise correlation induced splitting of Kramers’ escape rate from a metastable state – P K Ghosh, B C bag and D S Ray, J. Chem. Phys., 127, 044510 (2007)

314. Instability and pattern formation in reaction-diffusion systems: A higher order analysis – S S riaz, R Sharma, S P Bhattacharyya and D S Ray, J. Chem. Phys., 127, 064503 (2007)

315. Diffusion and mobility driven instability in a reaction-diffusion system; a review – S S riaz and D S Ray, Ind. J. Phys., 81, 1177 (2007)

316. Quantum ratchet motion – P K Ghosh and D S Ray, J. Ind. Inst. Science, 87, 401 (2007)

317. Thermo-diffusion induced instabilities in reactive systems – S Dutta and D S Ray, Phys. Rev., E75, 066206 (2007)

318. Effects of delay in a reaction-diffusion system under the influence of an electric field – S Dutta and D S Ray, Phys. Rev., E77, 036202 (2008)

319. Temperature dependence and temperature compensation of kinetics of chemical oscillations; Belousev-Zhabotinskii reaction, Glycolysis and Circadian rhythms – S Sen, S S Riaz and D S Ray, Jour. Theo. Bio., 250, 103 (2008)

320. Response Properties of 2-electron 2D Quantum Dots: Triplet versus Singlets – M Ghosh, R K Hazra and S P Bhattacharyya, Computing Letters (A D Buckingham Commemorative Issue), 3, 183 (2007)

321. Quantum Adiabatic Switching Route to the Impurity Modulated States of 2-D Quantum Dots with different Switching Functions – R K Hazra, M Ghosh and S P Bhattacharyya, Intern. J. Quantum Chem., 108, 719 (2008)

322. Tunneling time and Tunneling Dynamics – K Maji, C K Mondal and S P Bhattacharyya, Intern. Rev. Phys. Chem., 26, 647 (2007)

323. Modulation of Electronic States of 2D single carrier Quantum dots due to the presence of hole-doped impurity perturbations – R K Hazra, M Ghosh and S P Bhattacharyya, Chem. Phys., 344, 61 (2008) IACS ANNUAL REPORT 2007-08  181

324. Target excitations in 2D Quantum Dots by Optimized Chirped pulses – M Ghosh, R Sharma and S P Bhattacharyya, Chem. Phys. Letts., 449, 165 (2007)

325. Size-dependent linear and non-linear optical response of single carrier two dimensional quantum dots – M Ghosh and S P Bhattacharyya, J. Physics and Chemistry of Solids, 69, 981 (2008)

326. Dissociation Dynamics of a Diatomic Molecule induced by discontinuous Reversals of Static Electric field – S Ghosh and S P Bhattacharyya, Intern. J. Quantum Chem., 108, 1209 (2008)

327. The Curl equations for an induced Renner- Teller type model – B Sarkar, S Adhikari, Ind. J. Phys. 81, 925 (2007)

Polymer Science Unit

328. Preparation of Size-Controlled, Highly Populated, Stable and Nearly Monodispersed Ag Nanoparticles in Organic Medium from a Simple Interfacial Redox Process using a Conducting Polymer – A Dawn, P Mukherjee and A K Nandi, Langmuir (Letters), 23, 2531 (2007)

329. Nano-structured Self Assembly of Double Stranded DNA and Poly(o-methoxyaniline) Hybrid – A Dawn and A K Nandi, J. Phys. Chem. C, 111, 6268 (2007)

330. Piezoelectric b-Polymorph in Poly(vinlidene fluorie)-Functionalized Multiwalled Carbon Nanotube Nanocomposite – S Manna and A K Nandi, J. Phs. Chem. C., 111, 14670 (2007)

331. Multiporous Materials From Thermoreversibe Poly(vinyledene fluoride) Gels – D Dasgupta and A K Nandi, Macromol. Symp., 251, 15 (2007)

332. Synthesis, Optical and Electrical Characterization of Organically Soluble Silver Nanoparticles and its Poly(3-hexylthiophene) Nanocomposites : Enhanced Luminescence Property in the Nanocomposite Thin Films – B K Kuila, A Garai, and A K Nandi, Chemistry of Materials, 19, 5443 (2007)

333. A Mechanistic Approach on Self-organization of the Two-Component Thermoreversible Hydrogel of Riboflavin and Melamine – A Saha, S Manna and A K Nandi, Langmuir, 23, 13126 (2007)

334. Rheology of Polyaniline – Dinonylnaphthalene Disulfonic Acid (DNNDSA) Montmorillonite Clay Nanocomposites in the Sol State: Shear Thinning versus Pseudo-Solid Behavior – A Garai and A K Nandi, J. Nanosci. Nanotechnol. 8, 1842 (2008)

335. Rheology of (±)-Camphor-10-Sulfonic Acid Doped Polyaniline – m-Cresol Conducting Gel Nanocomposites – A Garai and A K Nandi, J. Polym. Sci., Polym. Phsics Ed., 46, 28 (2008)

336. Morphology, Structure, Rheology and Thermodynamics of Piezoelectric Poly(vinylidene fluoride)/Ethylene Carbonate Thermoreversible Gel – D Dasgupta, S Manna, A Garai, A Dawn, C Rochas, J M Guenet and A K Nandi, Macromolecules, 41, 779 (2008)

337. Micellization and interfacial behaviour of binary and ternary mixtures of model cationic and nonionic surfactant mixtures in aqueous NaCl medium – A A Dar, M R Rather, S Ghosh and A R Das, J. Colloid Interface Sci., 322, 572 (2008)

338. Novel Ascorbic Acid Based Ionic Liquids for the In Situ Synthesis of Quasi-Spherical and Anisotropic Gold Nanostructures in Aqueous Medium - E Dinda, S Si, A Kotal and T K Mandal, Chem. Eur. J., 14, 5528 (2008) 182  IACS ANNUAL REPORT 2007-08

339. Synthesis of Semitelechelic POSS-Polymethacrylate Hybrids by Thiol-Mediated Controlled Radical Polymerization with Unusual Thermal Behaviors – A Kotal, S Si, T K Paira and T K Mandal, J. Poly. Sci. Poly. Chem. Ed., 46, 1111 (2008)

340. In Situ Synthesis of Gold and Silver Nanoparticles by Using Redox-Active Amphiphiles and Their Phase Transfer to Organic Solvents - S Si, E Dinda and T K Mandal, Chem. Eur. J., 13, 9850 (2007)

341. Synthesis and Catalytic Application of Nanostructured Silver Dendrites – M H Rashid and T K Mandal, J. Phys. Chem. C, 111, 16750 (2007)

342. Organic Ligand-Mediated Synthesis of Shape-Tunable Gold Nanoparticles: An Application of their Thin-Film as Refractive Index Sensors – M H Rashid, R R Bhattacharjee, and T K Mandal, J. Phys. Chem. C, 111, 9684 (2007)

Raman Center for Atomic Molecular & Optical Sciences

343. Effective p-electron Hamiltonian for small-radii nanotubes: Interpretation of curvature- induced conductivity – P Szakacs, P R Surjan, D Mukherjee, S Das, Phys. Rev., B 77, 193407 (2008)

344. Theoretical estimation of lifetimes of the lowest metastable states in Sc III and Y III – B K Sahoo, H S Nataraj, B P Das, R K Chaudhuri and D Mukherjee, J. Phys. B: At. Mol. Opt. Phys., 41, 055702 (2008)

345. Relativistic unitary coupled cluster theory and applications – C Sur, R K Chaudhuri, B K Sahoo, B P Das and D Mukherjee, J. Phys. B: At. Mol. Opt. Phys., 41, 065001 (2008)

346. The electron electric dipole moment enhancement factors of Rubidium and Caesium atoms – H S Nataraj, B K Sahoo, B P Das, R K Chaudhuri and D Mukherjee, J. Phys.: Conf. Ser., 80, 012050 (2007)

2 171 + 347. Electric quadrupole moment of the 5d D3/2 state in Yb : A relativistic coupled-cluster analysis – K V P Latha, C Sur, R K Chaudhuri, B P Das and D Mukherjee, Phys. Rev., A76, 062508 (2007)

348. Investigations of Ra+ properties to test possibilities for new optical-frequency standards – B K Sahoo, B P Das, R K Chaudhuri, D Mukherjee, R G E Timmermans and K Jungmann, Phys. Rev., A76, 040504 (2007)

2 349. Enhanced role of electron correlation in the hyperfine interactions in D5/2 states in alkaline- earth- metal ions – B K Sahoo, C Sur, T Beier, B P Das, R K Chaudhuri and D Mukherjee, Phys. Rev., A75, 042504 (2007)

350. Theoretical studies of the atomic transitions in boron-like ions: Mg VIII, Si X and S XII – H S Nataraj, B K Sahoo, B P Das, R K Chaudhuri and D Mukherjee, J. Phys. B Atomic and Optical Phys., 40, 3153 (2007)

351. Isoltrap an on-line Penning trap for mass spectrometry on short-lived nuclei – M Mukherjee, K Blaum, D Beck, G Bollen, P Delahaye, J Dilling, S George, C Guenaut, F Herfurth, A Herlert, A Kellerbauer, H-J Kluge, B Moore, S Schwarz, L Schweikhard and C Yazidjian, Eur. Phys. J., A35, 1 (2008) IACS ANNUAL REPORT 2007-08  183

352. ISOLTRAP mass evolution around A=22 – M Mukherjee, D Beck, K Blaum, G Bollen, P Delahaye, J Dilling, S George, C Guenaut, F Herfurth, A Herlert, H-J Kluge, U Kster, D Lunney, S Schwarz, L Schweikhard and C Yazidjian, Eur. Phys. J., A35, 31 (2008)

Centre for Advanced Materials

353. Direct evidence for hidden one-dimensional Fermi surface of hexagonal K0.25WO3 – S Raj, T Sato, S Souma, T Takahashi, D D Sarma, P Mahadevan, J C Campuzano, M Greenblatt and W H McCarroll, Phys. Rev., B77, 245120 (2008)

354. Theory of the unusual doping and temperature dependence of photoemission spectra in manganites – P Sanyal, S Sen Gupta, N Pakhira, H R Krishnamurthy, D D Sarma and T Ramakrishnan, , Euro Phys. Lett., 82, 47010 (2008)

355. Electronic structure, phonons and dielectric anomaly in ferromagnetic insulating double- pervoskite La2NiMnO6 – H Das, U V Waghmare, T Saha-Dasgupta, D D Sarma, Phys. Rev. Lett., 100, 186402 (2008)

356. Optically Bi-functional Hetero-Structured Nanocrystals – A Nag, A Kumar, P Prem Kiran, S Chakraborty, G Ravindra Kumar and D D Sarma, J. Phys. Chem., C112, 8229 (2008)

357. First principle study of structural stability and electronic structure of CdS nanoclusters – S Datta, M Kabir, T SahaDasgupta, D D Sarma, J. Phys. Chem., C112, 8206 (2008)

358. Pressure and temperature dependence of the Fano resonance in the Raman spectrum of A2FeMoO6 (A = Sr, Ca) systems – D Marrocchelli, P Postorino, D Di Castro, E Arcangeletti, P Dore, M Cestelli Guidi, S Ray and D D Sarma, Phys. Rev. B, 76, 172405 (2007)

359. Growth of Nanocrystals in Solution – R Viswanatha and D D Sarma, Nanomaterials Chemistry, 139, (2007)

360. White Light from Mn2+-Doped CdS Nanocrystals: A New Approach – A Nag and D D Sarma, J. Phys. Chem. C (Letters), 111, 13641 (2007)

361. Ferromagnetism in metallic chalcospinels CuCr2S4 and CuCr2Se4 – T Saha-Dasgupta, M De Raychaudhury and D D Sarma , Phys. Rev. B, 76, 054441 (2007)

362. Critical test for Altshuler-Aronov Theory: Evolution of the density of states singularity in Double perovskite Sr2FeMoO6 with controlled disorder – M Kobayashi, K Tanaka, A Fujimori, S Ray and D D Sarma, Phys. Rev. Lett., 98, 246401 (2007)

363. Growth mechanism of nanocrystals in solution: ZnO, a case study – R Viswanatha, P K Santra, C Dasgupta and D D Sarma, Phys. Rev. Lett., 98, 255501 (2007)

364. A Study of Mn2+ Doping in CdS Nanocrystals – A Nag, S Sapra, C Nagamani, A Sharma, N Pradhan, S V Bhat and D D Sarma, Chem. Mater., 19, 3252 (2007)

365. Electronic structure of sodium tungsten bronzes NaxWO3 by high-resolution angle- resolved photoemission spectroscopy – S Raj, H Matsui, S Souma, T Sato Takahashi, A Chakraborty, D D Sarma, P Mahadevan, S Oishi, W H McCarroll and M Greenblatt, Phys. Rev. B, 75, 155116 (2007)

366. Intergranular magnetoresistance in Sr2FeMoO6 from a magnetic tunnel barrier mechanism – D D Sarma, S Ray, K Tanaka, M Kobayashi, A Fujimori, P Sanyal, 184  IACS ANNUAL REPORT 2007-08

INTER DEPARTMENTAL PUBLICATIONS

1. Supramolecular architecture in an oxovanadium (v)-schiff base complex: synthesis, Ab initio structure determination from X-ray powder diffraction, DNA binding and cleavage activity – S Mondal, M Mukherjee, K Dhara, S Ghosh, J Ratha, P Banerjee and A K Mukherjee, Crystal Growth & Design, 7, 1716 (2007)

2. Nanowires of Metal-Organic complex by Photocrystallization: A System to Achieve Addressable Electrically-Bistable Devices and Memory Elements – A K Rath, K Dhara, P Banerjee, and A J Pal, Langmuir, 24, 5937 (2008)

3. Metastability and magnetic memory effect in Ni2Mn1.4Sn0.6 – S Chatterjee, S Giri, S Majumdar and S K De, Phys. Rev. B, 77, 012404 (2008)

4. Magnetic after-effect in Ni-Mn-Sb Heusler Alloy – S Chatterjee, S Giri, S Majumdar and S K De, J. Magn. Magn. Mater., 320, 617 (2008)

5. Magneto-structural instability in Ni2Mn1.4Sb0.6 alloy – S Chatterjee, S Giri, S Majumdar, A K Deb, S K De and V Hardy; J. Phys.: Condens. Matter, 19, 346213 (2007)

6. Transport, magnetic and structural investigations of Co-Ni-Al alloy – S Chatterjee, M Thakur, S Giri, S Majumdar, A K Deb and S K De, J.Alloys Compounds, 456, 96 (2008)

7. Spin-glass like behaviour in the nanoporous Fe2O3 with amorphous structure – M Thakur, S Majumdar, S Giri, A Bhaumik, M Nandi, H Nakamura, H Kobayashi, and T Kohara, J. Phys.: Condens. Matter, 20, 295228 (2008) IACS ANNUAL REPORT 2007-08  185

Paper published in Books

1. Materials Transaction – Guest Editors: Y Kawazoe, G P Das, H Mizuseki, R Sahara, Japan Institute of Metals, Society of Nano-science and Technology (Special Issue on ACCMS Working Group Meeting on Clusters and Nanomaterials) Vol. 48, pp 637-792 (2007)

2. Trends in Optical Materials Research – A Patra, Nova Science Publishers, Inc, NY, USA, pp 91-112 (2007)

3. Bioinformatics – Principles and Applications, Oxford University Press, (2008)

4. Characterization of two substituted benzimidazoles as potential excited state proton transfer system along with modulation of their photophysical properties in different media including nano-cavity and micro-heterogeneous systems at different pH – S Chakravorti, P Chowdhury and T Adhikary, Photo/Electrochemistry and Photobiology in the Environment, Energy and Fuel, Ed. S Kaneco, Research Signpost,Trivandrum, India, pp141-176 (2007)

5. Attempts to prolong the survival duration of charge-separated products – T Ganguly, Photo/ electrochemistry & Photobiology in the Environment, Energy and Fuel (PE & P in EEF) (Editor- in-Chief: Prof Satoshi Kaneco) (2008)

6. Scanning Electron Microscopic Characterization of Copper (II) Phthalocyanine Nanocrystallites Thin Films Deposited on Technologically Important Substrates”, B Mallik and S Karan, Microscopy Book Series (No. 3) titled “Modern Research and Educational Topics in Microscopy”, A Mendez-Vias and J Diaz (Eds.), published by Formatex Research Center, Spain, Vol-2, pp671- 682 (2007) 186  IACS ANNUAL REPORT 2007-08

Papers Presented in Symposia / Conferences

Materials Science

1. Micro structural and Magnetic Characterization of Fe doped SnO2 nanoparticles – R Adhikari, D Karmakar, G Ghatak, P V Satyam, G P Das and A K Das, Proceedings of the DAE Solid State Physics Symposium (2007)

2. Ti-doped Si60H60 Fullerenes as Possible Hydrogen Storage Material – S Barman, P Sen and G P Das, Proceedings of IUMRS-ICAM International Conference, Bangalore (2007)

3. First-principles investigation of CdS clusters, nanotubes and nanowires doped with transition metal atoms – S Ghosh and G P Das, Proceedings of ACCMS-VO Meeting, Sendai, (2008)

4. Synthesis and Room Temperature Ferromagnetism in Fe doped NiO nanorods – S Manna and S K De, Proceeding of the DAE Solid State Physics symposium, 52 , 279 (2007)

5. Photoluminescence behavior of mesoporous and super-microporous titanium dioxides synthesized by using new designed chelating structure directing agents – D Chandra, S K Das and A Bhaumik, International Symposium on Surface and Colloid Science, ISI, Kolkata, India (2007)

6. Template free synthesis of phosphate based mesoporous materials – K Sarkar, M Nandi and A Bhaumik, International Symposium on Surface and Colloid Science, ISI, Kolkata, India (2007)

7. Mesopores in organic cresol-formaldehyde matrices – M Nandi and A Bhaumik, 10th Anniversary of CRSI National Symposium in Chemistry, IISc, Bangalore, India (2008)

8. Meso-scale ordered assembly of ultra small superparamagnetic g-Fe2O3 nanoparticles – A Mitra, A Bhaumik, C Vázquez-Vázquez, M A López-Quintela and B K Roy, International Symposium on Surface Science, Jadavpur University, Feb. 13-15, Kolkata, India (2008)

9. Thickness optimization of ZnO films – S Mridha and D Basak, Proceedings of the DAE Solid State Physics Symposium, Barkatullah University, Bhopal, India (2006)

Solid State Physics

10. Origin of high-ê in CuO – S Sarkar, P K Jana, and B K Chaudhuri, 3rd Indo Japan Conference on Ferroics and Multiferroics, IACS and SNBNCBS, Kolkata, India, February 4-6, 2008

11. Current switching behaviour and colossal electroresistance in electron doped polycrystalline

Ca0.85La0.15MnO3 – E Bose and B K Chaudhuri, 3rd Indo Japan Conference on Ferroic and Multiferroics, IACS and SNBNCBS, Kolkata, India, February 4-6, 2008

12. An alternating High dielectric ceramics for memory devices – P K Jana, S Sarkar and B K Chaudhuri; 3rd Indo Japan Conference on Ferroic and Multiferroics, IACS and SNBNCBS, Kolkata, India, February 4-6, 2008

13. High dielectric KxTiyNi1-x-yO (KTNO) ceramics – P K Jana, S Sarkar, and B K Chaudhuri, ICMS-ICMR Winter School on Chemistry and Physics, JNCASR, Bangalore, India, December 6-13, 2007 IACS ANNUAL REPORT 2007-08  187

14. Magnetic properties of Er2O3 nanocrystals dispersed in silica matrix – P Dasgupta and S Mukherjee, Intenational Conference on Magnetic Materials (ICMM-2007), AIP Conference proceedings 1003, SINP, Kolkata, India, December 11-16, 2007

15. Ab-initio structure determination of two of Cyclohexanespiro-5-hydantoin from X-ray powder- diffraction data – B Chattopadhyay and M Mukherjee, 37th National Seminar on Crystallography, Department of Physics, Jadavpur University, Kolkata, India, February 6-8 2008

16. Molecular dynamics simulations of nucleic acid – B Chattopadhyay, K Chowdhury and M Mukherjee, 37th National Seminar on Crystallography, Department of Physics, Jadavpur University, Kolkata, India, February 6-8 2008

17. Crystal structures of merohedrally twinned pentaisothiocyanateoxorhenium and hexaisothiocyanatorhenium complexes – D K Hazra and M Mukherjee, 37th National Seminar on Crystallography, Department of Physics, Jadavpur University, Kolkata, India, February 6-8 2008

18. Relaxation Papers Presented in Symposia / Conferences dynamics in superionic glasses and nanocomposites – S Bhattacharya and A Ghosh, Proc. Of American Ceramic Society 2007 Glass and Optical Materials Division Meeting and 18th University Conference on Glass, Alfred University, Rochester, New York, USA, May 20 – 23, 2007

19. Dielectric properties of LaMn0.7Fe0.3O3 – A Karmakar, M Patra, S Majumdar and S Giri, Proceedings of the 3rd Indo-Japan Conference on Ferroics and Multiferroics, Indian Association for the Cultivation of Science, Kolkata, India, February 4 – 6, 2008

20. Exchange bias in cluster-glass LaMn0.7Fe0.3O3 – M Patra, K De, S Majumdar and S Giri, Proceedings of the International Conference on Magnetic Materials, Saha Institute of Nuclear Physics, Kolkata, India, December 11 - 16, 2007

21. Spin glass like features in cluster glass compound La1-äMn0.7Fe0.3O3 – K De, M Patra, S Majumdar and S Giri, Proceedings of the DAE Solid State Physics Symposium, University of Mysore, Mysore, India, December 27 – 31, 2007

22. Exchange bias with Fe substitution in LaMnO3 – M Patra, K De, S Majumdar, and S Giri, Proceedings of the DAE Solid State Physics Symposium, University of Mysore, Mysore, India, December 27 – 31, 2007

23. Magnetic Investigation on Ni-Mn-Sn Ferromagnetic Shape Memory Alloy – S Chatterjee, S Giri, S Majumdar and S K De, International Conference on Ferromagnetic Shape Memory Alloys, S. N. Bose National Centre for Basic Sciences, Kolkata, India, November 14 - 16, 2007

24. Compositional dependence of Martensitic transition in Co-Ni-Al alloys – S Chatterjee, S Giri, S Majumdar and S K De, Proceedings of the DAE Solid State Physics Symposium, University of Mysore, Mysore, India, December 27 – 31, 2007

Spectroscopy

25. Steady state and time resolved spectroscopic investigation on the electron transfer processes involved within Rubrene donor and duroquinone acceptor – P Mandal and T Ganguly, Trombay symposium on Radiation and Photochemistry, January 7 – 11, 2008 188  IACS ANNUAL REPORT 2007-08

26. Comparative studies on intramolecular photoinduced electron transfer reactions within two novel synthesized dyads – G Mandal, M Bardhan, S Bhattacharya, T Ganguly, Trombay symposium on Radiation and Photochemistry, January 7 – 11, 2008

27. The fate of charge separation and charge recombination processes within the artificial solar energy conversion devices – T Sahu and T Ganguly, International symposium on Light and Life-2007, August 29-31, 2007

28. How to enhance the survival duration of charge-separated species – M Bardhan, S Bhattacharya, A De, T Ganguly, 10th CRSI National Symposium at Bangalore, February 1-3, 2008

29. Control of probe response and dispersion in a three level closed ? system : Interplay between Spontaneously Generated Coherence and Dynamically Induced Coherence – S Dutta and K Rai Dastidar, IX European Conference Atomic and Molecular Physics, Heraklion, Crete, Greece, May 6-11, 2007

30. Ground state properties and elementary excitation of 85Rb Bose-Einstein condensate : analytical method for modified Thomas-Fermi model with large gas-parameter – M Gupta and K Rai Dastidar, IX European Conference Atomic and Molecular Physics, Heraklion, Crete, Greece, May 6-11, 2007

31. Control of wavepacket interference and vibrational distribution by control of phase between ultrashort pulses – A Bhattacharjee and K Rai Dastidar, IX European Conference Atomic and Molecular Physics, Heraklion, Crete, Greece, May 6-11, 2007

32. Control over group velocity in a three level closed ? system via spontaneously generated coherence and dynamically induced coherence – S Dutta and K Rai Dastidar, XXV International Conference on Photonic, Electronic and Atomic Collisions, Freidberg, Germany, July 25-31, 2007. Also at Workshop on control of optical phenomena, IIT Kanpur, July 9-10, 2007

33. Analytical method to study Ground state properties and elementary excitation of 23Na Bose- Einstein condensate for large gas-parameter – M Gupta and K Rai Dastidar, XXV International Conference on Photonic, Electronic and Atomic Collisions, Freidberg, Germany, July 25-31, 2007. Also at Workshop on control of optical phenomena, IIT Kanpur, July 9-10, 2007

34. Control of selective vibrational distribution and oscillation of dissociation cross section by using delayed phase-locked pulses in NaH – A Bhattacharjee and K Rai Dastidar, XXV ICPEAC held at Freiburg, Germany, 25 - 31 July, 2007

35. Realization of EIT in LiH molecule: Effect of Spontaneously Generated Coherence and Dynamically Induced Coherence, – S Dutta and K Rai Dastidar, Topical Conference on Atomic and Molecular Physics, Sardar Patel University, Gujarat, January 3 – 5, 2008

36. Ground state properties and elementary excitation of atomic Bose-Einstein condensate in large gas parameter region: Analytical method for isotropic and anisotropic traps – M Gupta and K Rai Dastidar, Topical Conference on Atomic and Molecular Physics, Sardar Patel University, Gujarat, January 3 – 5, 2008

37. Spin-currents in intense-field ionization of hydrogen atom: Interaction with local and non- local electromagnetic field – K Rai Dastidar and S Bhattacharya, Topical conference on atomic and molecular physics ‘TC2008’, Sardar Patel University, Gujrat, January 3-5, 2008 IACS ANNUAL REPORT 2007-08  189

38. Properties of atomic Bose-Einstein condensates in a cylindrical trap: analytical approach – M Gupta and K Rai Dastidar, International Symposium on atomic, molecular and optical sciences & high performance computing: A seamless frontier, Vedic Village, Kolkata, January 10-12, 2008

39. Photophysics of 4-nitro 1-hydroxy 2-naphthoic acid – D Sahoo and S Chakravorti, One-day annual in-house symposium of Centre for Advanced Materials, IACS, Kolkata, July 13, 2008

40. Spectroscopic properties of iodine rare-gas van der Waals molecules: a CCSD(T) study – N C.Bera and A K Das, Topical Conference on Atomic and Molecular Physics (TC-2008), at Department of Physics, Sarder Patel University, Vallabh Vidyanagar, Gujarat - 388 120, January 3 - 5, 2008

41. Stability, structural properties and dissociation of XCN (X=Br, I) – I Bhattacharyya and A K Das, Topical Conference on Atomic and Molecular Physics (TC-2008), at Department of Physics, Sarder Patel University, Vallabh Vidyanagar, Gujarat - 388 120, January 3 – 5, 2008

42. Spectroscopy of weakly bound rare-gas diatomic halides: A theoretical study – N C Bera and A K Das, Symposium on Advanced Methods of Quantum Chemistry and Physics (SAMQCP-2007) at Institute of Physics, Faculty of Chemistry, Nicolaus Copernicus University, Torun, Poland, September 2 – 6, 2007

43. Copper (II) Phthalocyanine Nanostructured Thin Films: Effects of Annealing on Fractal surface – S Karan and B Mallik, Solid State Physics Symposium, Dept. of Atomic Energy (SSP-DAE), University of Mysore, Karnataka, India (Ref: Proceedings of the DAE Solid State Symposium, p. 595, December, 2007

Theoretical Physics

44. Temperature Dependence of Critical Number of Particles for Attracting Atomic Bose Gas – S Biswas, STATPHYS-23, 23rd Int. Conf. on Statistical Physics, IUPAP, Conf. Centre, Genova, Italy, 9 –13 July, 2007

45. Antihydrogen Production in trapped Anti-proton and Positron Plasmas – C Sinha, S Ghosh Deb and S Roy, XXV ICPEAC, Freiburg, Germany, July 25 –31, 2007

46. Effect of a Two Colour Laser Field and Phase on Electron Impact Excitation of a Hydrogen – like Ion – C Sinha, S Ghosh Deb and S Roy, XXV ICPEAC, Freiburg, Germany, July 25 –31, 2007

47. Calculation of scattering lengths of hydrogen-hydrogen system including mass effect – S Chakraborty, XXV ICPEAC, Freiburg, Germany, July 25 –31, 2007

48. S-wave resonances of the positron-hydrogen system in Debye plasma environment using the complex coordinate rotation model – S Chakraborty, IV Int. Conf. on Low Energy Positron and Positronium Physics, Reading Univ., England, August 2 – 4, 2007

49. Antiproton-antihydrogen (Proton-Hydrogen) Scattering at Low Energies – S Chakraborty, IV Int. Conf. on Low Energy Positron and Positronium Physics, Reading Univ., England, August 2 – 4, 2007

50. Randall- Sundrum with Kalb-Ramond field: Return of the hierarchy problem? – S Das, A Dey 190  IACS ANNUAL REPORT 2007-08

and S Sengupta, J Phys Conf. Ser, 68: 012009 (2007)

51. Fermion mass splitting, stability and naturalness problems in warped braneworld models – S Sengupta, AIP conference Proceedings, vol. 939: 236, (2007)

52. Partially Spin-Polarized Josephson Tunneling between Non-Centro symmetric Superconductors

like CePt3Si”- S P Mukherjee, Magnetic and Superconducting Materials (MSMO7) Khiva, Uzbekistan, September 25 –30, 2007

53. Effect of Mass on Singlet Scattering length of cold Hydrogen – Hydrogen system” – S Chakraborty and A S Ghosh, Topical Conf. on Atomic and Molecular Physics-TC2008, Sardar Patel University, Gujrat, January 3 - 5, 2008

54. Hydrogen –Hydrogen Collisions including exchange effect – Y N Tiwari and S Chakraborty, Topical Conf. on Atomic and Molecular Physics-TC2008, Sardar Patel University, Gujrat, January 3 -5, 2008

Energy Research Unit

55. Nanocrystalline silicon – A material for thin film solar cells with better stability – S Mukhopadhyay, A Chowdhury and S Ray, Proceedings of European Material Research Society, Strusbourg, France, May 28 - June 1, 2007

56. Fabrication of low defect density nanocrystalline silicon absorber layer and its application in thin film solar cell – A Chowdhury, S Mukhopadhyay and S Ray, Proceedings of European Material Research Society, Strusbourg, France, May 28-June 1, 2007

57. Influence of p-layer on characteristics of absorber layer and Nanocrystalline Silicon Thin Film Solar Cells – S Ray, A Chowdhury, K Adhikary and S Mukhopadhyay, Proceedings of 22nd European Photovoltaic Solar Energy Conference and Exhibition Milano, Italy, September 3-7, 2007

58. Light induced degradation in nanocrystalline Si films and related solar cells: Role of crystalline fraction – S Mukhopadhyay, R Goswami, S Ray, Proceedings of 17th Photovoltaic Solar Energy Conference and Exhibition, Fukuoka, Japan, December 3-7, 2007

59. Microstructure and residual stress in nanocrystalline silicon films: Materials for solar cells – S Ray, A Chowdhury and S Sengupta, Proceedings of 17th Photovoltaic Solar Energy Conference and Exhibition, Fukuoka, Japan, December 3-7, 2007

60. Solid phase crystallization of protocrystalline silicon films: changes in structural and optical properties – R Goswami and S Ray, Proceedings of International Conference on Solar Cell (IC SOLACE 2008), Cochin, India, January 21 – 23, 2008

61. The open-circuit voltage in micro-crystalline silicon solar cells of different degrees of crystallinity – M Nath, P Roca i Cabarrocas, E V Johnson, A Abramov and P Chatterjee, presented at the European Materials Research Society, Symposium D, Strasbourg, France, May 28 – June 1, 2007

62. Why does the open-circuit voltage in a micro-crystalline silicon PIN solar cell decrease with increasing crystalline volume fraction?, presented BY WHOM at the 22nd International Conference of Amorphous and Nano-crystalline Semiconductors, Breckenridge, Colorado, IACS ANNUAL REPORT 2007-08  191

USA, August 19 – 24, 2007

63. Influence of defect states on the surface of a c-Si wafer on the performance of N-a-Si:H/ P-c- Si double heterojunction solar cells – A Datta and P Chatterjee, presented BY WHOM at the International Conference on Solar Cells, Cochin, India, January 21-23, 2008

64. Computer modeling of “Heterojunction with Intrinsic Thin layers (HIT)” Solar Cells, invited talk presented BY WHOM at the National Symposium on Recent Trends in Renewable Energy Technologies, HNB Garhwal University, Uttaranchal, March 26-28, 2008

65. Study of the a-SixGe1-x:H films deposited by pulsed RF-PECVD – A Bhaduri and P Chaudhuri, Abstracts of the 18Th Annual General Meeting of Material Research Society of India (MRSI) 2007, p. 120

66. High Diffusion Length Silicon Germanium Alloy Thin Films Deposited By Pulsed RfPECVD Method – P Chaudhuri, A Bhaduri, A Bandyopadhyay, S Vignoli, P P Ray, Christophe Longeaud, 22nd International Conference on Amorphous and Nanocrystalline Semiconductors (22 ICANS), Breckenridge, USA, August 19 - 24, 2007

Biological Chemistry

67. Identification, purification and some properties of a protein inhibitor of glyceraldehyde-3- phosphate dehydrogenase - A Roy, M Ray, S Ray; Society of Biological Chemists (India) 76th Annual Meeting, SVU, Tirupati. November 25 - 27, 2007

68. Immunomodulation and signaling cascade by methylglyoxal - A Pal, N Bhattacharyya and M Ray; Society of Biological Chemists (India) 76th Annual Meeting, SVU, Tirupati. November 25 - 27, 2007

69. Down-Regulation of Creatine/Creatine Kinase System in Sarcoma Tissue: A Potential Diagnostic Marker for Tumor Progression – S Bera, A Ghosh, S Ray and M Ray; Society of Biological Chemists (India) 76th Annual Meeting, SVU, Tirupati. November 25 - 27, 2007

70. Unsaturation at the surfactant head: Effect on the surface-active enzymes in reverse micelles – S Debnath, D Das and P K Das; Proceeding of the International Symposium on Recent Trends in Surface and Colloid Science, Indian Statistical Institute, Kolkata, November 15-16, 2007

71. Dipeptide based amphiphilic antibacterial hydrogels – R N Mitra, D Das, S Roy and P K Das; Proceeding of the International Symposium on Recent Trends in Surface and Colloid Science, Indian Statistical Institute, Kolkata, November 15-16, 2007

72. Amino Acid Based Amphiphilic Hydrogelators: Potent for Biomedicinal Applications – S Roy and P K Das; Joint Indo-German bilateral Seminar, ‘Antimicrobial Drug Resistance and the Development of New Antibiotics, Indian National Science Academy, New Delhi, November 22-25, 2007

73. Amino Acid Based Amphiphilic Hydrogelators: Potent for Antibacterial Activity and Controlled Release – S Roy and P K Das; Proceeding of the 10th CRSI-RSC (2nd) National Symposium in Chemistry, Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, January 31 – February 3, 2008

74. Mixed (w/o) Microemulsion: The Route towards Superior Activity of Enzymes – A Shome, 192  IACS ANNUAL REPORT 2007-08

D Das and P K Das; Proceeding of the International Conference on Soft Systems, Center for Surface Science, Department of Chemistry, Jadavpur University, Kolkata, February 13-15, 2008

75. Synthesis and Properties of Novel Bolaamphiphiles - K Maiti, R N Mitra, P K Das, S P Moulik and A K Rakshit; Proceeding of the International Conference on Soft Systems, Center for Surface Science, Department of Chemistry, Jadavpur University, Kolkata, February 13-15, 2008

76. BBR3464, a trisplatin cancer drug under phase II trial, induces severe structural alterations of DNA: An Atomic Force Microscopy study at single molecule level – T Banerjee and R Mukhopadhyay; International Conference on Nanoscience and Technology, Chennai, India, February 27-29, 2008

77. Time dependent DNA structural changes induced by Nogalamycin: Transition to plectonemic coiling observed by Atomic Force Microscopy study at single molecule level – T Banerjee, A K Das and R Mukhopadhyay; International Conference on Nanoscience and Technology, Chennai, India, February 27-29, 2008

Organic Chemistry

78. Green Reactions Avoiding Hazardous Organic Solvent and Toxic Catalyst - B C Ranu, National Workshop on Green Chemistry Practices & their Aplications, Cotton College, Guwahati, Abs. pp 10, April 1-4, 2007

79. Green Chemistry in Teaching and Research – B C Ranu, DST sponsored Workshop on Green Chemistry, NIPER, Mohali, Chandigarh , Abs. pp 01, September 3-4, 2007

80. Palladium and Copper Nanoparticles as Catalysts in Carbon-Carbon and Carbon-Heteroatom Bond Formation – B C Ranu, 4th Annual Symposium of Indo-French Center in Organic Synthesis, Dinard, France, Abs. pp 41, September 12-14, 2007

81. Potential of Metal Nanoparticles in Organic Reactions – B C Ranu, Second International Symposium on Atomic Technologies, Awaji city, Japan, Abs. pp 16, October 1-2, 2007

82. Pd Nanoparticles as Efficient Catalyst for Carbon-Carbon Bond Formation – K Chattopadhyay, L Adak, A Saha, S Bhadra, D Saha, R Dey and B C Ranu, National Symposium in Chemistry (CRSI), IISC, Bangalore, Abs. pp 195, February 1-3, 2008

83. Green Chemistry in Teaching and Research – B C Ranu, National Conference on Windows of Chemistry-I, Bankura Sammilani College, West Bengal, Abs. pp 10, February 7-9, 2008

84. Domino metathesis involving ROM-RCM. Rapid access to tricycle [n.4.0.4.10] ring systems present in ingenanes - S Ghosh, C Malik and M Ghosh, Eighth Tetrahedron Symposium, Berlin, Germany, Abs. pp 1.105, June 26-29, 2007

85. Olefin metathesis based approach to umbellactal and sequosempervirin A - S Maity and S Ghosh, 3rd JNOST Symposium, Gurunanak Dev University, Amritsar, Abs. pp 52, November 15-18, 2007 IACS ANNUAL REPORT 2007-08  193

Polymer Science Unit

86. Nanocomposites of Multiwalled Carbon Nanotubes and Electro active Polmers – A K Nandi, International Conference IUMRS-ICAM 2007, Bangalore Abstract Book, Page 1-8, October 8-13, 2007

87. Nanocomposites of Carbon Nanotube and Electroactive Polymers – A K Nandi, Colloquium on Perspectives in Polymer Science and Technology, IACS, Kolkata, Abstract Book, Page 12, December 22, 2007

88. Synthesis of Anisotropic Gold and Silver Nanostructures and Their Catalytic Application - Md. H Rashid and T K Mandal, ICONSAT-2008: International Conference on Nano Science and Technology, Chennai, India, February 27-29, 2008

89. Novel Redox Active Amphiphiles to Synthesis Gold and Silver Nanoparticles and Their Phase Transfer to Non-Polar Solvents – E Dinda, S Si and T K Mandal, ICONSAT-2008: International Conference on Nano Science and Technology, Chennai, India, February 27-29, 2008

90. Stimuli-Responsive Assembly of Peptide-functionalized Gold nanoparticles for Colorimetric Sensors – S Si and T K Mandal, SICC-5: Singapore International Chemistry Conference 5, Singapore, December 17- 19, 2007 194  IACS ANNUAL REPORT 2007-08

staff strength as on 31st march, 2008

DIRECTOR & HIS STAFF B Mondal, Office Suptd. A Nandy, Office Suptd. D Mukherjee, Director A Chakraborty, Office Suptd. S Ray, Professor (Computer Centre) T K Kabashi, Office Suptd. S Deoghuria, Scientist III (System Analyst) S K Biswas, Assistant (F&A) S Saha, Secretary to Director’s Directorate D Mondal, Assistant ADMINISTRATION P Manna, Assistant P C Kar, Assistant Administrative S Bhattacharyya, UDC S K Mukherjee, Registrar (from (12.10.07) T Sardar, UDC N C Das Roy, Registrar (Actg) (upto 11.10.07) S Mallik, UDC D Bandyopadhyay, Dy. Registrar P Ghosh Dastidar, Tel. Op.-cum-Receptionist (A.R.) G S Mukherjee, Asst. Registrar-II B Barua, Sr. Record Keeper ‘B’ (Sel. Gd) S B Moulik, Internal Audit Officer S K Behura, Sr. Record Keeper ‘B’ A Pal, Asst. Registrar-I R K Routh, Helper ‘B’ S N Moulick, Asst. Registrar-I A Das, Helper ‘C’ A Roy, Asst. Registrar G Chakraborty, Helper ‘B’ S S Das, Asst. Register B Roy, Helper ‘B’ M Mukherjee, Asst. Registrar S Seal, Helper ‘B’ S Ghosh, Asst. Registrar S Mitra, Helper ‘B’ B K Das Gupta, Asst. Registrar-I (Store) D K Pal, Watch & Ward Asst. S Mukhopadhyay, F&AO N Yadav, Watch & Ward Asst. Sibabrata Roy, F & A O -II R G Sharma, Watch & Ward Asst. Subrata Roy, F & A O -II S N Das, Watch & Ward Asst. G Chattopadhyay, F & A O-I R Rai, Watch & Ward Asst. S Nath, F & A O-I D P Gimire, Watch & Ward Asst. P K Goon, F & A O-I S Mondal, Sec. Asstt. ‘B’ S Saha, Office Suptd.-II P Roy, Sec. Asstt. ‘B’ M S Sarkar, Office Suptd.-II G Chakraboraty, Sec. Asstt. ‘B’ S K Mukhopadhyay, Office Suptd.-II P K Guria, Security Guard P P Chakraborty, Sr. Security Officer-I A Adhikari, Garden Chowdhuiry ‘B’ B Sarkar, F & A O-I N Majumdar, Garden Chowdhuiry ‘B’ A Chakraborty, F & A O A Behura, Garden Chowdhuiry ‘B’ P Kundu, F & A O P Sahoo, Garden Chowdhuiry ‘B’ D Majhi, F & A O Sonai Sardar, Mali S Thakur, Office Suptd. (F&A) J Singh Balmiki, Cons. Supervisor A K Saha, Office Suptd. (F&A) R C Balmiki, Head Jamadar ‘B’ A Datta, Office Suptd. (F&A) H Rai, Head Jamadar ‘B’ A K Majumdar, Office Suptd. A Singh Harijan, Cons. Supervisor IACS ANNUAL REPORT 2007-08  195

R C Harijan, Cons. Supervisor S Bose, Tech. Officer-I A Harijan, Jamadar R Hazra, Tech. Officer-I M Balmiki, Sweeper S Saha, Tech. Officer-I S Mondal, Head Jamadar ‘A’ P Dasgupta, Tech. Officer A K Harijan, Sweeper S Maji, Tech. Officer R K Balmiki, Sweeper P Sinha, Tech. Officer S Choudhury, Tech. Suptd.-I Technical S K Sinha, Tech. Suptd. S N Bose, Engineer P K Das, Tech. Suptd. A K Sarkar, Asst. Engineer B N Mondal, Tech. Suptd. R Debnath, Jr. Engineer A K Roy, Tech. Assistant ‘B’ D Majumdar, Jr. Engineer G K Manna, Tech. Assistant ‘B’ A Dhar, Jr. Engineer S S Roy, Tech. Assistant ‘B’ C Goswami, Jr. Engineer D Chakraborty, Tech. Assistant ‘B’ S K Pal, Staff Car Driver ‘D’ (Sel.Gd.) A K Chakraborty, Tech. Assistant ‘B’ N L Bera, Staff Car Driver ‘D’ M Mondal, Helper ‘B’ B Bug, Staff Car Driver ‘D’ R C Ghosh, Technical Suptd. (Plumbing) MATERIALS SCIENCE H Majumder, Tech. Suptd. (Plumbing) A Bhattacharyya, Asst. Registrar K Mondal, Sr. Technician (Plumbing) T Das, Office Suptd. A Basak, Tech. Suptd. (Lift) K K Das, Tech. Officer-II S Chatterjee, Sr. Technician U Sinha, Tech. Officer-I Temporary P K Das, Tech. Officer-I G C Basak, Tech. Suptd.-II A Bose, Staff Car Driver ‘C’ R N Chowdhury, Tech. Suptd.-I S Adak, Staff Car Driver ‘C’ S S Routh, Tech. Suptd. P Ghosh, Sr. Technician S Routh, Tech. Suptd. B Paul, Sr. Technician S Ghosh, Tech. Suptd. S Mitra, Security Asst. ‘B’ S Sikdar, Tech. Asst. ‘B’ CANTEEN R Sardar, Tech. Asst. ‘B’ T Bala, Tech. Asst. ‘B’ S K Ghosh, Manager-cum-Salesman S Naskar, Tech. Asst. ‘B’ B Sardar, Washboy-cum-Bearer S Guha Roy, Helper ‘B’ S Mondal, Washboy-cum-Bearer S Mitra, Washboy-cum-Bearer SOLID STATE PHYSICS S Barua, Washboy-cum-Bearer S Roy Rakshit, Asst. Registrar T Bera, Washboy-cum-Bearer S Pal, Asst. Registrar B Barik, Washboy-cum-Bearer K Bhattacharyya, Tech. Officer-II CENTRAL SCIENTIFIC SERVICES R C Ghoshal, Tech. Suptd. P K Roy, Tech. Suptd. S Dhall, Office Suptd.-I S K Das, Tech. Suptd. S Khatua, Tech. Officer-II P K Modak, Tech. Asst.’A’ C Chakraborty, Tech. Officer-I S Basu, Tech. Asst. ‘B’ 196  IACS ANNUAL REPORT 2007-08

N Kurmi, Tech. Asst. ‘A’ BIOLOGICAL CHEMISTRY D K Jadav, Tech. Asst. ‘A’ R N Raha, Asst. Registrar A Pandit, Helper ‘B’ S Saha, Office Suptd. SPECTROSCOPY L Sarkar, Tech. Officer-II S K Banerjee, Tech. Suptd. (Expd. on 26.09.07) C Bhattacharyya, Asst. Registrar-I P Singh, Tech. Suptd. (Expd. on 10.12.07) M Majumder, Assistant C K Das, Tech. Asst. ‘B’ S K Bhattacharyya, Tech. Officer-II G C Bairagi, Helper ‘C’ B Moitra, Tech. Officer-I S Bag, Helper ‘B’ M K Ghosh, Tech. Officer D K Majumdar, Tech. Suptd.-I INORGANIC CHEMISTRY S Das, Tech. Suptd. A K Bandyopadhyay, Tech. Suptd. S K Bhattacharyya, Office Suptd.-I N C Barick, Tech. Assistant ‘B’ T Chakraborty, Asst. Registrar C S Naskar, Tech. Assistant ‘A’ S Chakraborty, Tech. Officer-II S Chakraborty, Helper ‘C’ S Bhattacharya, Tech. Officer-II B Pathak, Tech. Officer-I THEORETICAL PHYSICS P Mitra, Tech. Officer-I T K Moulik, Asst. Registrar-I P K Manna, Tech. Suptd. B Ghosh, Asst. Registrar S Das, Tech. Suptd. S K Mukherjee, Tech. Suptd. P Majumdar, Tech. Suptd. S Balti, Tech. Assistant ‘A’ D Pramanik, Tech. Suptd. S Mandal, Tech. Assistant ‘A’ A K Nath, Tech. Assistant ‘B’ B Dorji, Helper ‘A’ G Biswas, Tech. Assistant ‘A’ T Nath, Helper ‘B’ ENERGY RESEARCH UNIT ORGANIC CHEMISTRY S Das, Office Suptd.-II B Hazra, F & A O S Pal, Asst. Registrar D Shome, Tech. Officer-I A Basak, Office Suptd. R G Manna, Tech. Officer-I A K Mukherjee, Tech. Officer-II (Retd. on 30.04.07) I Bhowmik, Tech. Officer-I P P Bhattacharyya, Tech. Officer-II S Dutta, Tech. Officer-I S Seal, Tech. Officer-I T K Dutta, Tech. Suptd. N Dutta, Tech. Officer-I S Sarkar, Tech. Suptd. S K Sarkar, Tech. Officer D Prasad, Tech. Suptd. B K Ghosh, Tech. Suptd. B Roy, Tech. Suptd. S Ray, Tech. Suptd. D Majumdar, Tech. Suptd. M K Naskar, Tech. Suptd. S K Barua, Helper ‘B’ R K Dey, Tech. Assistant ‘B’ S Ghosh Roy, Tech. Assistant ‘B’ MLS PROFESSOR’S UNIT A K Pal, Tech. Asst. ‘B’ U Chakraborty, Office Suptd. M Chowdhury, Tech. Assistant ‘B’ S Chakraborty, Tech. Suptd. B K Chandra, Helper ‘B’’ S K Sarkar, Tech. Assistant ‘A’ PHYSICAL CHEMISTRY IACS ANNUAL REPORT 2007-08  197

K K Dutta, Asst. Registrar S Bandyopadhyay, Workshop-in-Charge-I D Das Roy, Asst. Registrar-I (Retd. on 31.07.07) S Sil, Office Suptd.-II (Store)- M Bhattacherjee, Assistant S K Dutta, Office Suptd.-I (Store) A K Dasgupta, Tech. Suptd.-I P Nayak, Office Suptd. S Sinha, Tech. Suptd. S K Modak, Tech. Suptd. –II J Mondal, Tech. Assistant ‘A’ B P Ghosh, Tech. Suptd. –II (Retd. on 30.06.07) B Chandra, Tech. Assistant ‘A’ K M Maity, Tech. Suptd.-II S K Sarkar, Tech. Suptd.-I (Retd. on 31.12.07) POLYMER SCIENCE UNIT B Prasad, Tech. Suptd.-II A Chakraborty, Asst. Registrar S K Bose, Tech. Suptd.-I N Naskar, Tech. Officer-I A K Mallik, Tech. Suptd.-I S Roy, Tech. Officer N K Roy, Tech. Suptd.-I S Pal, Tech. Suptd. A Manna, Tech. Suptd.-I P G Chakraborty, Tech. Assistant ‘B’ N Ganguly, Tech. Suptd.-I R N Banik, Tech. Assistant ‘B’ B Pal, Tech. Suptd. C Bag, Tech. Assistant ‘B’ D Mitra, Tech. Suptd. R P Mondal, Tech. Assistant ‘A’ S S Prasad, Tech. Suptd. S Mistry, Helper ‘A’ H Dutta, Tech. Suptd. S Mallick, Tech. Suptd. LIBRARY S Haldar, Tech. Suptd. M Banerjee, Librarian J N Ghosh, Sr. Suptd. C K Das, Asst. Librarian-I S Mistry, Sr. Technician A Das Gupta, Asst. Librarian S Majumdar, Sr. Technician S Roy, Asst. Librarian S Bose, Sr. Technician A K Sardar, Asst. Registrar-I T Maity, Sr. Technician T K Mukherjee, Doc. Suptd.-I B Ghosh, Sr. Technician S K Dutta, Doc. Suptd.-I P Tarafdar, Sr. Technician S Roy Choudhury, Doc. Suptd.-I R Kumar, Sr. Technician R Roy, Sr. Doc. Assistant P K Rana, Sr. Technician S Chonger, Sr. Doc. Assistant P Das, Sr. Technician S B Misra, Sr. Doc. Assistant S K Pal, Sr. Technician G Pal, Doc. Assistant D S Yadav, Sr. Technician B Dafadar, Doc. Assistant S Basu, Jr. Technician S K Chandra, Doc. Assistant T Das, Helper ‘B’ P Debnath, Helper ‘B’ B Saha, Helper ‘B’ INDIAN JOURNAL OF PHYSICS P Mondal, Helper ‘B’ M Saha, Helper ‘B’ K K Datta, Scientist III (Retd. on 31.05.07) D Banerjee, Helper ‘B’ S Sahoo, Asst. Registrar-I G Das, Helper ‘B’ A Choudhury, Asst. Registrar K Karan, Helper ‘B’ A N Ghatak, Tech. Officer-I A Banerjee, Sr. Record Keeper ‘B’ T D Biswas, Helper ‘A’

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