Basics of Plasma Spectroscopy
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Absorption Spectroscopy and Imaging from the Visible Through Mid-Infrared with 20 Nm Resolution
Absorption spectroscopy and imaging from the visible through mid-infrared with 20 nm resolution. Aaron M. Katzenmeyer,1 Glenn Holland,1 Kevin Kjoller2 and Andrea Centrone1* 1Center for Nanoscale Science and Technology, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States. *E-mail: [email protected] 2Anasys Instruments, Inc., 325 Chapala Street, Santa Barbara, California 93101, United States. Abstract Absorption spectroscopy and mapping from visible through mid-IR wavelengths has been achieved with spatial resolution exceeding the limit imposed by diffraction, via the photothermal induced resonance technique. Correlated vibrational (chemical), and electronic properties are obtained simultaneously with topography with a wavelength-independent resolution of ≈ 20 nm using a single laboratory-scale instrument. This marks the highest resolution reported for PTIR, as determined by comparing height and PTIR images, and its first extension to near-IR and visible wavelengths. Light-matter interaction enables scientists to characterize materials and biological samples across a large range of energies. Visible (VIS) and near-infrared (NIR) light (from 400 nm to 2.5 µm) probes electronic transitions in materials [1], providing information regarding band gap, defects, and energy transfer which is crucial for the semiconductor and optoelectronic industries and for understanding processes such as photosynthesis. Mid-infrared (mid-IR) light (from 2.5 µm to 15 µm) probes vibrational transitions and provides rich chemical and structural information enabling materials identification [2]. Spectral maps can be obtained by coupling a light source and a spectrometer with an optical microscope [3]. However, light diffraction limits the lateral resolution achievable with conventional microscopic techniques to approximately half the wavelength of light [4]. -
Microwave Power Coupling with Electron Cyclotron Resonance Plasma Using Langmuir Probe
PRAMANA c Indian Academy of Sciences Vol. 81, No. 1 — journal of July 2013 physics pp. 157–167 Microwave power coupling with electron cyclotron resonance plasma using Langmuir probe SKJAIN∗, V K SENECHA, P A NAIK, P R HANNURKAR and S C JOSHI Raja Ramanna Centre for Advanced Technology, Indore 452 013, India ∗Corresponding author. E-mail: [email protected] MS received 14 April 2012; revised 16 January 2013; accepted 26 February 2013 Abstract. Electron cyclotron resonance (ECR) plasma was produced at 2.45 GHz using 200– 750 W microwave power. The plasma was produced from argon gas at a pressure of 2 × 10−4 mbar. Three water-cooled solenoid coils were used to satisfy the ECR resonant conditions inside the plasma chamber. The basic parameters of plasma, such as electron density, electron temperature, floating potential, and plasma potential, were evaluated using the current–voltage curve using a Langmuir probe. The effect of microwave power coupling to the plasma was studied by varying the microwave power. It was observed that the optimum coupling to the plasma was obtained for ∼ 600 W microwave power with an average electron density of ∼ 6 × 1011 cm−3 and average electron temperature of ∼ 9eV. Keywords. Electron cyclotron resonance plasma, Langmuir probe, electron density, electron temperature. PACS Nos 52.50.Dg; 52.70.–m; 52.50.Sw 1. Introduction The electron cyclotron resonance (ECR) plasma is an established source for delivering high current, high brightness, stable ion beam, with significantly higher lifetime of the source. Such a source has been widely used for producing singly and multiply charged ion beams of low to high Z elements [1–3], for research in materials sciences, atomic and molecular physics, and as an accelerator injector [4,5]. -
Plasma Diagnostics Lecture.Key
LA3NET School | Salamanca, Spain | October 1st, 2014 Advanced diagnostics Plasma density profile measurements and synchronisation of lasers to accelerators J. Osterhoff and L. Schaper Deutsches Elektronen-Synchrotron DESY Outline > Importance of the plasma density profile > Measurement techniques > Interferometry > Absorption spectroscopy > Rayleigh scattering > Raman scattering > Laser induced fluorescence > Synchronisation of lasers to accelerators > Summary Jens Osterhoff | plasma.desy.de | LA3NET School, Salamanca | Oct 1, 2014 | Page 002 Access to novel in-plasma beam-generation techniques requires control over plasma profile in LWFA/PWFA > Density down-ramp injection J. Grebenyuk et al., NIM A 740, 246 (2014) IB & 1kA > Laser-induced ionization injection (Trojan Horse injection) B. Hidding et al., Physical Review Letters 108, 035001 (2012) IB & 5kA > Beam-induced ionization injection A. Martinez de la Ossa et al., NIM A 740, 231 (2014) IB & 7.5kA > Wakefield-induced ionization injection A. Martinez de la Ossa et al., Physical Review Letters 111, 245003 (2013) IB & 10 kA Jens Osterhoff | plasma.desy.de | LA3NET School, Salamanca | Oct 1, 2014 | Page 003 Access to novel in-plasma beam-generation techniques requires control over plasma profile in LWFA/PWFA > Density down-ramp injection J. Grebenyuk et al., NIM A 740, 246 (2014) n0 = 1.2 x 1018 cm-3 IB & 1kA > Laser-induced ionization injection (Trojan Horse injection) B. Hidding et al., Physical Review Letters 108, 035001 (2012) Driver: Eb = 1 GeV, Ib = 10 kA, Qb = 574 pC σz = 7 μm, σx,y = 4 μm, εx,y = 1 μm IB & 5kA injection > Beam-induced ionization injection A. Martinez de la Ossa et al., NIM A 740, 231 (2014) acceleration IB & 7.5kA > Wakefield-induced ionization injection A. -
Absorption Spectroscopy
World Bank & Government of The Netherlands funded Training module # WQ - 34 Absorption Spectroscopy New Delhi, February 2000 CSMRS Building, 4th Floor, Olof Palme Marg, Hauz Khas, DHV Consultants BV & DELFT HYDRAULICS New Delhi – 11 00 16 India Tel: 68 61 681 / 84 Fax: (+ 91 11) 68 61 685 with E-Mail: [email protected] HALCROW, TAHAL, CES, ORG & JPS Table of contents Page 1 Module context 2 2 Module profile 3 3 Session plan 4 4 Overhead/flipchart master 5 5 Evaluation sheets 22 6 Handout 24 7 Additional handout 29 8 Main text 31 Hydrology Project Training Module File: “ 34 Absorption Spectroscopy.doc” Version 06/11/02 Page 1 1. Module context This module introduces the principles of absorption spectroscopy and its applications in chemical analyses. Other related modules are listed below. While designing a training course, the relationship between this module and the others, would be maintained by keeping them close together in the syllabus and place them in a logical sequence. The actual selection of the topics and the depth of training would, of course, depend on the training needs of the participants, i.e. their knowledge level and skills performance upon the start of the course. No. Module title Code Objectives 1. Basic chemistry concepts WQ - 02 • Convert units from one to another • Discuss the basic concepts of quantitative chemistry • Report analytical results with the correct number of significant digits. 2. Basic aquatic chemistry WQ - 24 • Understand equilibrium chemistry and concepts ionisation constants. • Understand basis of pH and buffers • Calculate different types of alkalinity. -
Resonance Raman Scattering of Light from a Diatomic Molecule
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Electrical & Computer Engineering, Department P. F. (Paul Frazer) Williams Publications of May 1976 Resonance Raman scattering of light from a diatomic molecule D. L. Rousseau Bell Laboratories, Murray Hill, New Jersey P. F. Williams University of Nebraska - Lincoln, [email protected] Follow this and additional works at: https://digitalcommons.unl.edu/elecengwilliams Part of the Electrical and Computer Engineering Commons Rousseau, D. L. and Williams, P. F., "Resonance Raman scattering of light from a diatomic molecule" (1976). P. F. (Paul Frazer) Williams Publications. 24. https://digitalcommons.unl.edu/elecengwilliams/24 This Article is brought to you for free and open access by the Electrical & Computer Engineering, Department of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in P. F. (Paul Frazer) Williams Publications by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Resonance Raman scattering of light from a diatomic molecule D. L. Rousseau Bell Laboratories. Murray Hill, New Jersey 07974 P. F. Williams Bell Laboratories, Murray Hill, New Jersey 07974 and Department of Physics, University of Puerto Rico, Rio Piedras, Puerto Rico 00931 (Received 13 October 1975) Resonance Raman scattering from a homonuclear diatomic molecule is considered in detail. For convenience, the scattering may be classified into three excitation frequency regions-off-resonance Raman scattering for inciderit energies well away from resonance with any allowed transitions, discrete resonance Raman scattering for excitation near or in resonance with discrete transitions, and continuum resonance Raman scattering for excitation resonant with continuum transitions, e.g., excitation above a dissociation limit or into a repulsive electronic state. -
Raman Spectroscopy for In-Line Water Quality Monitoring — Instrumentation and Potential
Sensors 2014, 14, 17275-17303; doi:10.3390/s140917275 OPEN ACCESS sensors ISSN 1424-8220 www.mdpi.com/journal/sensors Review Raman Spectroscopy for In-Line Water Quality Monitoring — Instrumentation and Potential Zhiyun Li 1, M. Jamal Deen 1,2,4,*, Shiva Kumar 2 and P. Ravi Selvaganapathy 1,3 1 School of Biomedical Engineering, McMaster University, Hamilton, ON L8S 4K1, Canada; E-Mails: [email protected] (Z.L.); [email protected] (P.R.S.) 2 Electrical and Computer Engineering, McMaster University, Hamilton, ON L8S 4K1 Canada; E-Mail: [email protected] 3 Mechanical Engineering, McMaster University, Hamilton, ON L8S 4K1, Canada 4 Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China * Author to whom correspondence should be addressed; E-Mail: [email protected] or [email protected]; Tel.: +1-905-525-9140 (ext. 27137); Fax: +1-905-521-2922. Received: 1 July 2014; in revised form: 7 September 2014 / Accepted: 9 September 2014 / Published: 16 September 2014 Abstract: Worldwide, the access to safe drinking water is a huge problem. In fact, the number of persons without safe drinking water is increasing, even though it is an essential ingredient for human health and development. The enormity of the problem also makes it a critical environmental and public health issue. Therefore, there is a critical need for easy-to-use, compact and sensitive techniques for water quality monitoring. Raman spectroscopy has been a very powerful technique to characterize chemical composition and has been applied to many areas, including chemistry, food, material science or pharmaceuticals. -
Plasma Physics Laboratory
MAY 1978 PPPL-1445 UC-20f <-'/C-7- -/ TOKAMAK PLASMA DIAGNOSIS BY SURFACE PHYSICS TECHNIQUES BY S. A. COHEN PLASMA PHYSICS LABORATORY WISER PRINCETON UNIVERSITY PRINCETON, NEW JERSEY- This work was supported by the U. S. Department of Energy v v;- Contract No. EY-76-C-02-3073. Reproduction, translation, „ : >v| publication, use and disposal, in whole or in part, by or S» for the United States Govemme:"i: is -ipi^-h-•<• »,-• :;,•*'$$* NOTICE This report was prepared as an account of work sponsored by the United States Gov ernment. Neither the United States nor the United States Energy Research and Development: Administration, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express cr implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. Printed in the United States of America. Available from National Technical Information Service U. S. Department of Commerce 5285 Port Royal Road Springfield, Virginia 22151 Price: Printed Copy $ * ; Microfiche $3.00 NTIS *Pages Selling Price 1-50 $ 4.00 51-150 5.45 151-325 7.60 326-500 10.60 501-1000 13.60 ]' i"i •:'.! -n t.ed a I : he Th rd International Con i"e ronce . m I'L Sut'' •><:•e lnti ir.tcV ion ; in Controlled I-'union Devices, I'll I 1,-ibor.j lory, ' J K '', •7 Apr i I 1978- ABSTRACT The utilization of elementally-sensitive surface techniques as plasma diagnostics is discussed with emphasis on measuring impurity fluxes, charge states, and energy distributions in the plasma edge. -
Fluorescent, Prussian Blue-Based Biocompatible Nanoparticle System for Multimodal Imaging Contrast
Supplementary Materials Fluorescent, Prussian Blue-Based Biocompatible Nanoparticle System for Multimodal Imaging Contrast László Forgách 1,*, Nikolett Hegedűs 1, Ildikó Horváth 1, Bálint Kiss 1, Noémi Kovács 1, Zoltán Varga 1,2, Géza Jakab 3, Tibor Kovács 4, Parasuraman Padmanabhan 5, Krisztián Szigeti 1,*,† and Domokos Máthé 1,6,7,*,† 1 Department of Biophysics and Radiation Biology, Semmelweis University, 1085 Budapest, Hungary; [email protected] (N.H.); [email protected] (I.H.); [email protected] (B.K.); [email protected] (N.K.); [email protected] (Z.V.) 2 Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, 1117 Budapest, Hungary; [email protected] (Z.V.) 3 Department of Pharmaceutics, Semmelweis University, 1085 Budapest, Hungary; [email protected] 4 University of Pannonia, Institute of Radiochemistry and Radioecology, 8200 Veszprém, Hungary; [email protected] 5 Lee Kong Chian School of Medicine, Nanyang Technological University, 636921 Singapore, Singapore; [email protected] 6 In Vivo Imaging Advanced Core Facility, Hungarian Centre of Excellence for Molecular Medicine, 6723 Szeged, Hungary 7 CROmed Translational Research Centers, 1047 Budapest, Hungary * Correspondence: [email protected] (L.F.); [email protected] univ.hu (K.S.); [email protected] (D.M.); Tel.: +36-1-459-1500/60164 (L.F.); +36-1- 459-1500/60210 (D.M.) † These authors contributed equally to this work. Native, citrate-coated PBNPs The mean hydrodynamic diameter (intensity-based harmonic means or z-average) of citrate- coated PBNPs was 29.30 ± 2.08 (average ± SD, 푛 = 8), as determined by DLS. -
Methods Employed in Optical Emission Spectroscopy Analysis: a Review
Ingeniería y Ciencia ISSN:1794-9165 | ISSN-e: 2256-4314 ing. cienc., vol. 11, no. 21, pp. 239–267, enero-junio. 2015. http://www.eafit.edu.co/ingciencia This article is licensed under a Creative Commons Attribution 4.0 By Methods Employed in Optical Emission Spectroscopy Analysis: a Review D. M. Devia 1, L. V. Rodriguez-Restrepo 2and E. Restrepo-Parra 3 Received: 15-06-2014 | Acepted: 25-09-2014 | Onlínea: 01-30-2015 PACS: 52.25.Dg, 31.15.V- doi:10.17230/ingciencia.11.21.12 Abstract In this work, different methods employed for the analysis of emission spec- tra are presented. The proposal is to calculate the excitation temperature (Texc), electronic temperature (Te) and electron density (ne) for several plasma techniques used in the growth of thin films. Some of these tech- niques include magnetron sputtering and arc discharges. Initially, some fundamental physical principles that support the Optical Emission Spec- troscopy (OES) technique are described; then, some rules to consider dur- ing the spectral analysis to avoid ambiguities are listed. Finally, some of the more frequently used spectroscopic methods for determining the phy- sical properties of plasma are described. Key words: OES; plasma parameters; elemental determination; line intensity; broadening; shifting 1 Universidad Tecnológica de Pereira, Pereira, Colombia, [email protected]. 2 Universidad Nacional de Colombia, Sede Manizales, Colombia, [email protected] . 3 Universidad Nacional de Colombia, Sede Manizales, Colombia [email protected]. Universidad EAFIT 239j Methods Employed in Optical Emission Spectroscopy Analysis: a Review Métodos empleados en el análisis de espectroscopía óptica de emisión: una revisión Resumen En este trabajo se presentan diferentes métodos empleados para el análisis de espectros ópticos de emisión. -
Atomic Spectroscopy 008044D 01 a Guide to Selecting The
PerkinElmer has been at the forefront of The Most Trusted inorganic analytical technology for over 50 years. With a comprehensive product Name in Elemental line that includes Flame AA systems, high-performance Graphite Furnace AA Analysis systems, flexible ICP-OES systems and the most powerful ICP-MS systems, we can provide the ideal solution no matter what the specifics of your application. We understand the unique and varied needs of the customers and markets we serve. And we provide integrated solutions that streamline and simplify the entire process from sample handling and analysis to the communication of test results. With tens of thousands of installations worldwide, PerkinElmer systems are performing WORLD LEADER IN inorganic analyses every hour of every day. Behind that extensive network of products stands the industry’s largest and most-responsive technical service and support staff. Factory-trained and located in 150 countries, they have earned a reputation for consistently AA, ICP-OES delivering the highest levels of personalized, responsive service in the industry. AND ICP-MS PerkinElmer, Inc. 940 Winter Street Waltham, MA 02451 USA P: (800) 762-4000 or (+1) 203-925-4602 www.perkinelmer.com For a complete listing of our global offices, visit www.perkinelmer.com/ContactUs Copyright ©2008-2013, PerkinElmer, Inc. All rights reserved. PerkinElmer® is a registered trademark of PerkinElmer, Inc. All other trademarks are the property of their respective owners. Atomic Spectroscopy 008044D_01 A Guide to Selecting the Appropriate -
Ice Features in the Mid-IR Spectra of Galactic Nuclei?
A&A 385, 1022–1041 (2002) Astronomy DOI: 10.1051/0004-6361:20020147 & c ESO 2002 Astrophysics Ice features in the mid-IR spectra of galactic nuclei? H. W. W. Spoon1,2,J.V.Keane2,A.G.G.M.Tielens2,3,D.Lutz4,A.F.M.Moorwood1, and O. Laurent4 1 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany e-mail: [email protected]; [email protected] 2 Kapteyn Institute, PO Box 800, 9700 AV Groningen, The Netherlands e-mail: [email protected]; [email protected] 3 SRON, PO Box 800, 9700 AV Groningen, The Netherlands 4 Max-Planck-Institut f¨ur Extraterrestrische Physik (MPE), Postfach 1312, 85741 Garching, Germany e-mail: [email protected] Received 28 November 2001 / Accepted 24 January 2002 Abstract. Mid infrared spectra provide a powerful probe of the conditions in dusty galactic nuclei. They variously contain emission features associated with star forming regions and absorptions by circumnuclear silicate dust plus ices in cold molecular cloud material. Here we report the detection of 6–8 µm water ice absorption in 18 galaxies observed by ISO. While the mid-IR spectra of some of these galaxies show a strong resemblance to the heavily absorbed spectrum of NGC 4418, other galaxies in this sample also show weak to strong PAH emission. The 18 ice galaxies are part of a sample of 103 galaxies with good S/N mid-IR ISO spectra. Based on our sample we find that ice is present in most of the ULIRGs, whereas it is weak or absent in the large majority of Seyferts and starburst galaxies. -
Supporting Information Kerr Gated Raman Spectroscopy of Lipf6 Salt
Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is © the Owner Societies 2019 Supporting Information Kerr gated Raman spectroscopy of LiPF6 salt and LiPF6-based organic carbonate electrolyte for Li-ion batteries Laura Cabo-Fernandez,[a] Alex R. Neale,[a] Filipe Braga,[a] Igor V. Sazanovich,[b] Robert Kostecki,[c] Laurence J. Hardwick*[a] [a] Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool, Peach Street, Liverpool, L69 7ZF (United Kingdom). [b] Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, OX11 0QX (United Kingdom). [c] Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States). * [email protected] S1 Principles of Raman spectroscopy When a sample is lightened by a laser, the molecule interacts with the incident photon through the virtual energy level and then another photon is scattered; therefore, scattering processes can be looked at as the absorption of one photon and the instantaneous emission of another photon. The process is elastic if the scattered photon has the same energy as the incident one (Es=Ei), in which case it is known as Rayleigh scattering, or if both photons have different energy (Es≠Ei) it is an inelastic process. Raman spectroscopy is based on these inelastic phenomena and it could be a Stokes scattering if the scattered photon has less energy than the incident one (Es< Ei) or if it has more energy (Es>Ei) an anti-Stokes scattering, as seen in Figure 1 (a). Fluorescence lifetime and quantum yields1 Fluorescence quantum yield (Q) defined as the ratio of photons emitted to the number of photons absorbed1 could be equal to 1, whereas the yield of Raman inelastic scattering can be several orders of magnitude lower.