DOCSLIB.ORG

The Longitudinal Neutron Resonant Spin Echo Spectrometer RESEDA

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Longitudinal Neutron Resonant Spin Echo Spectrometer RESEDA The longitudinal neutron resonant spin echo spectrometer RESEDA C. Franza,b,∗, O. Soltwedela,b,e, C. Fuchsb, S. S¨aubertb,a, F. Haslbecka,d, A. Wendla, J. K. Jochumb,c, P. B¨onia, C. Pfleiderera aPhysik Department, Technische Universit¨atM¨unchen,D-85748 Garching, Germany bHeinz Maier-Leibnitz Zentrum (MLZ), Technische Universit¨atM¨unchen,D-85748 Garching, Germany cBayerisches Geoinstitut, Universit¨atBayreuth, D-95440 Bayreuth, Germany dInstitute for Advanced Study, Technische Universit¨atM¨unchen,D-85748 Garching, Germany ePhysik Department, Technische Universit¨atDarmstadt, D-64287 Darmstadt, Germany Abstract The instrumental layout and technical realisation of the neutron resonant spin echo (NRSE) spectrometer RESEDA at the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching, Germany, is presented. RESEDA is based on a longitudinal field configuration, boosting both dynamic range and maximum resolution of the spectrometer compared to the conventional transverse layout. The resonant spin echo technique enables the realisation of two complementary techniques: A longitudinal NRSE (LNRSE) option comparable to the classical neutron spin echo (NSE) method for highest energy resolution and large momentum transfers as well as a Modulation of Intensity with Zero Effort (MIEZE) option for depolarising samples or sample environments such as high magnetic fields, and strong incoherent scattering samples. With their outstanding dynamic range, exceeding nominally seven orders of magnitude, both options cover new fields for ultra-high resolution neutron spectroscopy in hard and soft condensed matter systems. In this paper the concept of RESEDA as well as the technical realisation along with reference measurements are reported. Keywords: neutron spectroscopy, neutron spin echo, NRSE, MIEZE 1. Introduction One existing NRSE spectrometer for quasi-elastic scattering is located at LLB, France [7]. Neutron Resonance Spin Echo (NRSE) [1] is The longitudinal NRSE (LNRSE) technique [8] a Larmor labelling technique similar to Neutron overcomes the limitations of conventional trans- Spin Echo (NSE) [2] that was developed to study verse NRSE. First, the longitudinal rf flippers are amongst other things slow dynamics in liquid so- by design self-correcting, which increases the high- lutions, polymers, and spin glasses. In NRSE, est resolution significantly. Second, the field sub- traditionally employed in a transverse geometry traction method [9] allows to reach infinitesimally (TNRSE, magnetic field perpendicular to the neu- small Fourier times, leading to a unique dynamic tron flight path), the large solenoids generating the range, nominally exceeding seven orders of mag- precession fields in NSE are replaced by pairs of nitude. Furthermore the LNRSE method allows much shorter resonant spin flippers (RSF). However the use of Modulation of Intensity with Zero Effort due to the lack of sufficient manufacturing accu- (MIEZE) [10, 11], an NRSE variant that is insen- racy, TNRSE always stayed behind NSE by two or- sitive to depolarising conditions such as large mag- ders of magnitude in resolution. But the technique netic fields at the sample position and depolarising proved to be very successful in combination with arXiv:2103.12836v1 [physics.ins-det] 23 Mar 2021 (e.g. ferromagnetic) samples. For strongly inco- triple-axes spectrometry to resolve narrow phonon herent scattering samples MIEZE does not show linewidths [3, 4, 5] and for Larmor diffraction [6]. the 2/3 background arising from spin flip scat- tering in contrast to conventional NSE (NRSE). Essentially, MIEZE is a high-resolution spin-echo ∗Corresponding author. +49 89 289 14760 Email address: [email protected] (C. TOF method using only the primary spectrometer Franz) arm for beam preparation [12]. Typical applica- Preprint submitted to Elsevier March 25, 2021 tions comprise so far the investigation of quantum typically used for non-magnetic samples and with- phase transitions, ferromagnetic materials, super- out depolarising sample environment when high- conductors, skyrmions and hydrogenous samples. est resolution and/or large scattering angles are The MIEZE method is being actively developed needed. Typical experiments include dynamics in at various places around the world, including the bulk or confinement of macro molecules [16] or liq- Reactor Institute Delft, the ISIS neutron source uids [17] and glass transitions in polymers [18]. For [13] and JSNS at J-PARC [14, 15]. Currently only magnetic samples it is possible to separate nuclear BL06 at the J-PARC Materials and Life Science and magnetic scattering by switching the π-flipper Experimental Facility (MLF) and RESEDA are in off. user operation with RESEDA being the only beam- In this mode two symmetric spectrometer arms line worldwide based on longitudinal resonant spin are used, with a π-flipper before the sample posi- flips. In this paper we present the instrumental tion to reverse the precession direction. All four concept as well as the technical implementation of resonant coils are operated at the same frequency, the LNRSE and MIEZE technique at the instru- with two coils per resonating circuit. To avoid fre- ment RESEDA at the Heinz Maier-Leibnitz Zen- quency drifts between the spectrometer arms, fre- trum (MLZ). Further we show the thorough char- quency generators are coupled on a 10 MHz clock acterisation of both measurement options, includ- signal. Small amplitude mismatches in the rf-coil- ing resolution measurements and compare them to current, caused by manufacturing limitations, are analytical calculations as well as neutron flux cal- compensated by built-in attenuators in the capac- culations using Monte-Carlo simulations. itance boxes. The NRSE signal is identical to an NSE echo with the envelope being the Fourier trans- form of the incident wavelength band and the os- 2. Instrument concept cillation frequency proportional to the mean wave- length (cf. Fig 1 (a)). During regular experimental The aim of the REsonance Spin Echo for Diverse operation only n points of the spin echo signal are Applications (RESEDA) spectrometer is to provide recorded, with n typically ranging from 4 to 19. very high resolution neutron spectroscopy for vari- These are then fitted to yield the polarisation. The ous applications in hard and soft condensed matter. Fourier time can be calculated as Therefore RESEDA has been built to offer an ex- 2 tremely high dynamic range in time resolution, a 2γmN 3 τNRSE = λ B · L (1) broad band from small (SANS) to medium scat- ~2 tering angles as well as the ability to use a large with m the neutron mass, λ the neutron wave- variety of sample environments. To fulfill these N length and the product of the static magnetic field requirements, an NRSE and a MIEZE option are B and rf-flipper distance L. Note the factor two implemented at RESEDA. Both share the primary compared to NSE due to the resonant spin flip [1]. spectrometer arm but make use of individual sec- Fig. 2 shows the calculated resolution τ of ondary spectrometer arms. A simultaneous oper- NRSE the spectrometer color coded in ns depending on ation is not possible, however switching from one the neutron wavelength λ in A˚ and the field in- mode to the other only requires a few minutes. tegral B · L in 10−3 Tm. For short Fourier times the frequency is kept at 35 kHz due to the Bloch- 2.1. LNRSE Siegert shift [19] which determines the probability of a successful π-flip as the ratio of the static and rf- The LNRSE option of RESEDA offers a resolu- field strengths. In this regime the field subtraction tion comparable to standard NSE spectrometers, method is used. Ramping up the magnetic field in outperforming transverse NRSE by two orders of the field subtraction coils (NSE coils) the field in- magnitude in maximum Fourier time. The scat- tegral experienced by the neutrons may be reduced tered beam size is restricted compared to NSE due and short Fourier times are reached. to the use of the resonant flipper coils, limiting the detector size and hence solid angle coverage to 5.08 cm (2 inch) in diameter. The advantage over 2.2. LMIEZE NSE is the increased dynamic range towards small In contrast to LNRSE, MIEZE is essentially a Fourier times. At RESEDA the LNRSE option is high resolution TOF method, which can be used for 2 (a) 10 τ = 1.81ns 8 6 cts (a.u.) 4 2 P = 76.0% RESEDA 0.90 0.95 1.00 1.05 1.10 1.15 1.20 scanning current (A) (b) 0.8 (c) fMIEZE=1464Hz 30 0.6 0.4 20 MV Contrast 0.2 (a.u.) cts 10 A C = 75.0% 0.0 1.5 1.6 1.7 1.8 1.9 0 85 171 256 342 427 512 598 683 scanning current (A) time (μs) Figure 1: Spin echo group in NRSE and MIEZE, respectively. (a) Spin echo group at a moderate Fourier time of 1.81 ns in classical LNRSE mode. The intensity exhibits oscillations as a function of the current in the subtraction coil and the envelope is defined through the selector wavelength band. (b) The contrast of the MIEZE signal as a function of current in the subtraction coil. Here too, the shape of the MIEZE group is determined by the wavelength band. (c) Sinoidal intensity oscillations in MIEZE are in real time. The contrast shown in (b) is the ratio between the amplitude A and the mean value MV. 3 field subtraction 16 100 ns 102 14 10 ns 101 1 ns 100 12 100 ps 10−1 (ns) 10 10 ps 10−2 MIEZE τ 1 ps −3 Wavelength (Å) Wavelength 10 8 100 fs 10−4 6 10 fs 10−5 10−6 10−5 10−4 10−3 10−2 10−1 100 f2 − f1 (MHz) Figure 2: Color coded RESEDA NRSE resolution depending Figure 3: Color coded MIEZE resolution available at on neutron wavelength and the field integral defined by the RESEDA as a function of neutron wavelength and differ- resonant flipper frequency and subtraction field.
Load more

Recommended publications
  • Neutron Instrumentation
    Neutron Instrumentation Oxford School on Neutron Scattering 5th September 2019 Ken Andersen Summary • Neutron instrument concepts – time-of-flight – Bragg’s law • Neutron Instrumentation – guides – monochromators – shielding – detectors – choppers – sample environment – collimation • Neutron diffractometers • Neutron spectrometers 2 The time-of-flight (TOF) method distance Δt time Diffraction: Bragg’s Law Diffraction: Bragg’s Law Diffraction: Bragg’s Law Diffraction: Bragg’s Law Diffraction: Bragg’s Law Diffraction: Bragg’s Law λ = 2d sinθ Diffraction: Bragg’s Law λ = 2d sinθ 2θ Reflection: Snell’s Law incident reflected n=1 θ θ’ refracted n’<1 Reflection: Snell’s Law incident reflected n=1 θ θ’ refracted θ’=0: critical angle of total n’<1 reflection θc Reflection: Snell’s Law incident reflected n=1 θ θ’ refracted θ’=0: critical angle of total n’<1 reflection θc cosθc = n' n = n' Nλ2b n' = 1− ⇒ θc = λ Nb/π 2π ≈ − 2 cosθc 1 θc 2 Reflection: Snell’s Law incident reflected n=1 θ θ’ refracted θ’=0: critical angle of total n’<1 reflection θc cosθc = n' n = n' 2 for natural Ni, Nλ b n' = 1− ⇒ θc = λ Nb/π 2π θc = λ[Å]×0.1° cosθ ≈ 1− θ2 2 c c -1 Qc = 0.0218 Å Neutron Supermirrors Courtesy of J. Stahn, PSI Neutron Supermirrors Courtesy of J. Stahn, PSI Neutron Supermirrors Courtesy of J. Stahn, PSI Neutron Supermirrors λ Reflection: θc(Ni) = λ[Å] × 0.10° c λ 1 Multilayer: θc(SM) = m × λ[Å] × 0.10° λ 2 λ 3 λ 4 } d 1 } d 2 } d3 } d4 18 Neutron Supermirrors λ Reflection: θc(Ni) = λ[Å] × 0.10° c λ 1 Multilayer: θc(SM) = m × λ[Å] × 0.10° λ 2
    [Show full text]
  • Neutron Spin Echo Spectroscopy
    Neutron Spin Echo Spectroscopy Peter Fouquet [email protected] Institut Laue-Langevin Grenoble, France Oxford Neutron School 2017 What you are supposed to learn in this tutorial 1. The length and time scales that can be studied using NSE spectroscopy 2. The measurement principle of NSE spectroscopy 3. Discrimination techniques for coherent, incoherent and magnetic dynamics 4. To which scientific problems can I apply NSE spectroscopy? NSE-Tutorial Mind Map Quantum Mechanical Model Resonance Spin-Echo Classical Model Measurement principle “4-point Echo” NSE spectroscopy Instrument Frustrated Components Magnets Bio- molecules Time/Space Map NSE around Surface the globe Diffusion Science Cases Paramagnetic Spin Echo Experiment planning and Interpretation Diffusion Glasses Polymers Models Coherent and Incoherent Scattering Data Treatment The measurement principle of neutron spin echo spectroscopy (quantum mechanical model) • The neutron wave function is split by magnetic fields • The 2 wave packets arrive at magnetic coil 1 magnetic coil 2 polarised sample the sample with a time neutron difference t • If the molecules move between the arrival of the first and second wave packet then coherence is lost • The intermediate scattering t λ3 Bdl function I(Q,t) reflects this ∝ loss in coherence strong wavelength field integral dependence Return The measurement principle of neutron spin echo spectroscopy Dynamic Scattering NSE spectra for diffusive motion Function S(Q,ω) G(R,ω) I(Q,t) = e-t/τ Fourier Transforms temperature up ⇒ τ down Intermediate VanHove
    [Show full text]
  • High Resolution Spectroscopy with the Neutron Resonance Spin Echo Method
    High Resolution Spectroscopy with the Neutron Resonance Spin Echo Method vorgelegt von Diplom-Physiker Felix Groitl aus Erlangen von der Fakultät II - Mathematik und Naturwissenschaften der Technischen Universität Berlin zur Erlangung des akademischen Grades Doktor der Naturwissenschaften Dr. rer. nat. genehmigte Dissertation Promotionsausschuss: Vorsitzender: Prof. Dr. M. Kneissl Gutachter: Prof. Dr. D. A. Tennant Gutachter: Prof. Dr. P. Böni Gutachter: Dr. K. Habicht Tag der wissenschaftlichen Aussprache: 18.12.2012 Berlin 2013 D 83 Abstract The first part of this thesis is dedicated to explore new territory for high resolution Neu- tron Resonance Spin Echo (NRSE) spectroscopy beyond measuring lifetimes of elementary excitations. The data analysis of such experiments requires a detailed model for the echo amplitude as a function of correlation time. The model also offers guidance for planning NRSE experiments in terms of a sensible choice of parameters and allows predicting quan- titatively the information content of NRSE spectroscopy for line shape analysis or energy level separation. Major generalizations of the existing formalism, developed in this thesis, allow for violated spin echo conditions, arbitrary local gradient components of the dispersion surface and detuned parameters of the background triple axis spectrometer (TAS) giving rise to important additional depolarizing effects, which have been neglected before. Fur- thermore, the formalism can now be applied to any crystal symmetry class. The model was successfully tested by experiments on phonons in a high quality single crystal of Pb and the results demonstrate the stringent necessity to consider second order depolarization effects. The formalism was subsequently extended to analyze mode doublets. As a major step for- ward, detuning effects for both modes are taken into account here.
    [Show full text]
  • LCLS: the First Experiments
    LCLS THE FIRST EXPERIMENTS September 2000 ii Table of Contents First Scientific Experiments for the LCLS .....................................................v Atomic Physics Experiments ..........................................................................1 Plasma and Warm Dense Matter Studies......................................................13 Structural Studies on Single Particles and Biomolecules .............................35 Femtochemistry.............................................................................................63 Studies of Nanoscale Dynamics in Condensed Matter Physics....................85 X-ray Laser Physics ....................................................................................101 Appendix 1: Committee Members..............................................................113 iii iv First Scientific Experiments for the LCLS The Scientific Advisory Committee (SAC) for the Linac Coherent Light Source (LCLS) has selected six scientific experiments for the early phase of the project. The LCLS, with proposed construction in the 2003-2006 time frame, has been designed to utilize the last third of the existing Stanford Linear Accelerator Center (SLAC) linac. The linac produces a high-current 5- 15 GeV electron beam that is bunched into 230 fs slices with a 120 Hz repetition rate. When traveling through a sufficiently long (of order of 100 m) undulator, the electron bunches will lead to self amplification of the emitted x-ray intensity constituting an x-ray free electron laser (XFEL). If funded as proposed, the LCLS will be the first XFEL in the world, operating in the 800-8,000 eV energy range. The emitted coherent x-rays will have unprecedented brightness with 1012-1013 photons/pulse in a 0.2-0.4% energy bandpass and an unprecedented time structure with a design pulse length of 230 fs. Studies are under way to reduce the pulse length to tens of femtoseconds. This document presents descriptions of the early scientific experiments selected by SAC in the spring of 2000.
    [Show full text]
  • Neutron Spin Echo Spectroscopy
    Neutron Spin Echo Spectroscopy Catherine Pappas TU Delft uncluding slides and animations from R. Gähler, R. Cywinski, W. Bouwman Berlin Neutron School - 30.3.09 from the source to the detector sample and source moderator PSΕ ΙΝ sample environment PSE OUT detector Neutron flux φ = Φ η dE dΩ / 4π source flux intensity field of neutron distribution losses instrumentation definition of the beam : Q, E and polarisation Berlin Neutron School - 30.3.09 Neutron Spin Echo why ? very high resolution how ? using the transverse components of beam polarization Larmor precession Berlin Neutron School - 30.3.09 Neutron Spin Echo I: polarized neutrons - Larmor precession II: NSE : Larmor precession III: NSE : semi-classical description IV: movies V: quantum mechanical approach VI: examples VII: NSE and structure Berlin Neutron School - 30.3.09 Neutron Spin Echo I: polarized neutrons - Larmor precession II: NSE : classical description III: NSE : quantum mechanical description IV: movies V: NSE and coherence VI: exemples VII: NSE and structure Berlin Neutron School - 30.3.09 Polarized Neutrons ๏ polarizer ๏ analyzer magnetic field (guide - precession) magnetic field Neutron Neutron source polarizer B P analyzer detector flipper sample Berlin Neutron School - 30.3.09 Longitudinal polarization analysis Why longitudinal ???? after F. Tasset because we apply a magnetic field and measure the Berlinprojection Neutron School of - 30.3.09 the polarization vector along this field Larmor Precession Motion of the polarization of a neutron beam in a magnetic field dµ = γ (µ
    [Show full text]
  • Neutron Spectroscopy Study of the Diffusivity of Hydrogen in Mos2
    PCCP View Article Online PAPER View Journal | View Issue Neutron spectroscopy study of the diffusivity of hydrogen in MoS2 Cite this: Phys. Chem. Chem. Phys., 2021, 23, 7961 Vitalii Kuznetsov, ab Wiebke Lohstroh,c Detlef Rogalla,d Hans-Werner Becker,d Thomas Strunskus,e Alexei Nefedov, f Eva Kovacevic,g Franziska Traegerb and Peter Fouquet *a The diffusion of hydrogen adsorbed inside layered MoS2 crystals has been studied by means of quasi- elastic neutron scattering, neutron spin-echo spectroscopy, nuclear reaction analysis, and X-ray Received 29th September 2020, photoelectron spectroscopy. The neutron time-of-flight and neutron spin-echo measurements Accepted 18th December 2020 demonstrate fast diffusion of hydrogen molecules parallel to the basal planes of the two dimensional DOI: 10.1039/d0cp05136e crystal planes. At room temperature and above, this intra-layer diffusion is of a similar speed to the surface diffusion that has been observed in earlier studies for hydrogen atoms on Pt surfaces. A significantly rsc.li/pccp slower hydrogen diffusion was observed perpendicular to the basal planes using nuclear reaction analysis. Creative Commons Attribution-NonCommercial 3.0 Unported Licence. 1 Introduction in order to replace the expensive platinum, which is widely used today. Diffusion of molecules on surfaces is crucial for a range of Molybdenum disulphide, MoS2, has shown promising beha- chemical processes, such as catalysis or sensing, but it remains viour as a catalyst in the hydrogen evolution reaction (HER),6–10 extremely difficult to observe experimentally on atomic length which is completely in line with its known activity for hydro- scales. This is particularly true for the case of light molecules genation reactions.
    [Show full text]
  • (ATR–FTIR) Spectroscopy, Micro–Attenuated Total Reflectance Fourier
    Organic and Medicinal Chemistry International Journal ISSN 2474-7610 Image Article Organic & Medicinal Chem IJ Volume 6 Issue 1 - March 2018 Copyright © All rights are reserved by Alireza Heidari DOI: 10.19080/OMCIJ.2018.06.555677 Fourier Transform Infrared (FTIR) Spectroscopy, Attenuated Total Reflectance Fourier Transform Infrared (ATR–FTIR) Spectroscopy, Micro–Attenuated Total Reflectance Fourier Transform Infrared (Micro–ATR–FTIR) Spectroscopy, Macro–Attenuated Total Reflectance Fourier Transform Infrared (Macro–ATR–FTIR) Spectroscopy, Two–Dimensional Infrared Correlation Spectroscopy, Linear Two–Dimensional Infrared Spectroscopy, Non–Linear Two– Dimensional Infrared Spectroscopy, Atomic Force Microscopy Based Infrared (AFM–IR) Spectroscopy, Infrared Photodissociation Spectroscopy, Infrared Correlation Table Spectroscopy, Near– Infrared Spectroscopy (NIRS), Mid–Infrared Spectroscopy (MIRS), Nuclear Resonance Vibrational Spectroscopy, Thermal Infrared Spectroscopy and Photothermal Infrared Spectroscopy Comparative Study on Malignant and Benign Human Cancer Cells and Tissues under Synchrotron Radiation with the Passage of Time Alireza Heidari* Faculty of Chemistry, California South University, USA Submission: February 26, 2018; Published: March 29, 2018 *Corresponding author: Alireza Heidari, Faculty of Chemistry, California South University, 14731 Comet St. Irvine, CA 92604, USA, Email: Abbreviations: FTIR : Fourier Transform Infrared; ATR-FTIR: Attenuated Total Reflectance Fourier Transform Infrared; Micro-ATR-FTIR: Micro- Attenuated
    [Show full text]
  • Scientific Highlights
    Scientific Highlights 2010 Acoustic surface plasmon on Cu(111) . .28 A versatile “click” chemistry precursor of functional polystyrene nanoparticles . .30 Sodium: a charge-transfer insulator at high pressures . .32 Optical spectroscopy of conductive junctions in plasmonic cavities . .34 Performance of PNOF3 for reactivity studies: X[BO] and X[CN] isomerization reactions (X = H, Li) as a case study . .36 Mixed-valency signature in vibrational inelastic electron tunneling spectroscopy . .38 Theory of microwave-assisted supercurrent in quantum point contacts . .40 Rare-earth surface alloying: a new phase for GdAu2 . .42 Surveying molecular vibrations during the formation of metal-molecule nanocontacts . .44 Many-body effects in the excitation spectrum of a defect in SiC . .46 Magnetism of substitutional Co impurities in graphene: realization of single p vacancies . .48 Direct observation of confined single chain dynamics by neutron scattering . .50 Quasiparticle lifetimes in metallic quantum-well nanostructures . .52 2011 Atomic-scale engineering of electrodes for single-molecule contacts . .54 Plasmonic nanobilliards . .56 Quantum plasmon tsunami on a Fermi Sea . .58 Hierarchical selectivity in fullerenes: site-, regio-, diastereo-, and enantiocontrol of the 1,3-dipolar cycloaddition to C70 . .60 Anharmonic stabilization of the high-pressure simple cubic phase of calcium . .62 Circular dichroism in laser-assisted short-pulse photoionization . .64 Quasiparticle interference around a magnetic impurity on a surface with strong spin-orbit coupling . .66 Homolytic molecular dissociation in natural orbital functional theory . .68 One dimensional bosons: From condensed matter systems to ultracold gases . .70 Role of spin-flip transitions in the anomalous hall effect of FePt alloy . .72 Dye sensitized ZnO solar cells: attachment of a protoporphyrin dye to different crystal surfaces characterized by NEXAFS .
    [Show full text]
  • 07 the Workshops
    Workshops Works hops Index First Symposium of the nanoICT Coordination Action . 112 Ultrafast2008 International Symposium Electron dynamics and electron mediated phenomena at surfaces: femto-chemistry and atto-physics . 113 Quantum Coherence and Controllability at the Mesoscale . 115 1st DIPC-nanoGUNE-ICFO Meeting . 117 New Frontiers in Magnetism . 118 Workshop on Bio-Inspired Photonic Structures . 119 Summer School on Simulation Approaches to Problems in Molecular and Cellular Biology . 120 Workshop on Inorganic Nanotubes Experiment and Theory . 123 Atom by Atom: NANO2009 –Perspectives in nanoscience and nanotechnology . 125 BNC Tubes STREP Meeting . 127 Jülich Centre for Neutron Science Workshop 2009 Trends and Perspectives in Neutron Scattering on Soft Matter . 128 nanoICT School 2009 NanoPhotonics NanoOptics Modelling . 130 5th Laser Ceramics Symposium: International Symposium on Transparent Ceramics for Photonic Applications . 131 DIPC 08/09 111 First Symposium of the nanoICT Coordination Action Ultrafast2008 February 26, 2008 International Symposium Electron dynamics and electron mediated phenomena ORGANIZERS Antonio Correia (Fundación Phantoms, Spain) at surfaces: femto-chemistry and atto-physics Daniel Sanchez Portal (CSIC-UPV/EHU, DIPC, Spain) May 7-8, 2008 Nanoelectronics represent a strategic technology considering the wide range of possible applications. These include telecommunications, automotive, multimedia, consumer goods and medical systems. In the semi - ORGANIZERS conductor industry, Complementary Metal Oxide Semiconductor (CMOS) technology will certainly continue Raimundo Pérez-Hernández and Juan A. González-Palomino (Fundación Ramón Areces, Spain) to have a predominant market position in the future. However, there are still a number of technological chal - Pedro M. Echenique and Daniel Sanchez Portal (DIPC , Spain) lenges, which have to be tackled if CMOS downscaling should be pursued until feature sizes will reach 10 nm around the year 2015-2020.
    [Show full text]
  • ESS Instrument Construction Proposal <‌RESPECT‌>
    2014/2015 Instrument Construction Round Proposal Revision Date 4/16/2015 ESS Instrument Construction Proposal <‌RESPECT‌> Name Affiliation Main proposer Prof. Peter Böni Physik Department, Prof. Christian Pfleiderer Technische Universität München Dr. Robert Georgii FRM II, Technische Universität München Co-proposers Jonas Kindervater Physik Department, Technische Universität München ESS coordinator Dr. Melissa Sharp ESS Note: All proposals received by ESS will be included as Expressions of Interest for In-kind contribu- tions. ESS will use this information for planning purposes and the proposer or affiliated organization is not obligated to materially contribute to the project. The following table is used to track the ESS internal distribution of the submitted proposal. Name Affiliation Document Ken Andersen ESS reviewer Distribution Dimitri Argyriou, Oliver Kirstein, Arno Hiess, Robert Connatser, Sindra Petersson Årsköld, Richard Hall-Wilton, Phillip Bentley, Iain Sutton, Thomas Gahl, relevant STAP European Spallation Source ESS AB Visiting address: ESS, Tunavägen 24 P.O. Box 176 SE-221 00 Lund SWEDEN 2014/2015 Instrument Construction Round Proposal Revision Date 4/16/2015 www.esss.se 2(61) 2014/2015 Instrument Construction Round Proposal Revision Date 4/16/2015 EXECUTIVE SUMMARY We propose the construction of a REsonance SPin-echo spECtrometer for exTreme studies, RE- SPECT, that is ideally suited for the exploration of non-dispersive processes such as diffusion, crys- tallisation, slow dynamics, tunneling processes, crystal electric field excitations or spin fluctuations. The estimated cost of construction of RESPECT is around 8.8 Million Euros. The following aspects characterise RESPECT as a world-wide unique spectrometer: • RESPECT represents a high-resolution spin-echo spectrometer at a spallation source based on the longitudinal neutron resonance spin-echo (LNRSE) technique.
    [Show full text]
  • Notiziario Summary
    www.cnr.it/neutronielucedisincrotrone NOTIZIARIO Neutroni e Luce di Sincrotrone Rivista del Consiglio Nazionale delle Ricerche Cover photo: Contour plot and projection of the SUMMARY time-average muon polarisation in silver (I) oxide, Ag2O as a function of applied magnetic field and temperature. From this, detailed EDITORIAL .................................................................................................................................................... 2 information about the muon state electronic structure in this material, C.J. Carlile can be deduced, informing by analogy on the states adopted by hydrogen. Twenty-Years Italian/Anglo Science Collaboration to Continue............................................................................................................................ 3 C. Andreani and R.S. Eccleston 0.2 0.1 SCIENTIFIC REVIEWS The Research Scene of Femtosecond 3000 X-ray Diffraction.............................................................................................................. 4 2000 160 1000 120 P. Bergese and L.E. Depero 80 40 Magnetic Nanostructures studied by polarised Il NOTIZIARIO is published by neutron reflectometry: recent results and future CNR, and printed in collaboration prospects for polarised reflectometry at ISIS........................... 13 with the Facoltà di Scienze M.F.N. R.M. Dalgliesh and S. Langridge andNOTIZIARIO the Dipartimento di Fisica of the UniversitàNeutroni e Luce didegli Sincrotrone Studi di Roma “Tor Vergata”. The infrared Beamline SISSI at Elettra
    [Show full text]
  • Neutron Spin Echo Spectroscopy
    Neutron Spin Echo Spectroscopy Peter Fouquet [email protected] Institut Laue-Langevin Grenoble, France September 2014 Hercules Specialized Course 17 - Grenoble What you are supposed to learn in this lecture 1. The length and time scales that can be studied using NSE spectroscopy 2. The measurement principle of NSE spectroscopy 3. Discrimination techniques for coherent, incoherent and magnetic dynamics 4. To which scientific problems can I apply NSE spectroscopy? The measurement principle of neutron spin echo spectroscopy (quantum mechanical model) The neutron wave function is split by magnetic fields magnetic coil 1 magnetic coil 2 polarised sample The 2 wave packets arrive at neutron the sample with a time difference t If the molecules move between the arrival of the first and second wave packet then coherence is lost t λ3 Bdl The intermediate ∝ scattering function I(Q,t) reflects this loss in coherence strong wavelength field integral dependence The measurement principle of neutron spin echo spectroscopy Dynamic Scattering NSE spectra for diffusive motion Function S(Q,ω) G(R,ω) I(Q,t) = e-t/τ Fourier Transforms temperature up ⇒ τ down Intermediate VanHove Correlation Scattering Function Function I(Q,t) G(R,t) Measured with Neutron Spin Echo (NSE) Spectroscopy Neutron spin echo spectroscopy in the time/space landscape NSE is the neutron spectroscopy with the highest energy resolution The time range covered is 1 ps < t < 1 µs (equivalent to neV energy resolution) The momentum transfer range is 0.01 < Q < 4 Å-1 Spin Echo The measurement principle
    [Show full text]