Standard data analysis on the VESUVIO spectrometer at ISIS is carried out within the Impulse Approximation framework, making use of the West scaling variable y. The experiments are performed using the time-of-flight technique with the detectors positioned at constant scattering angles. Line shape analysis is routinely performed in the y-scaling framework, using two different (and equivalent) approaches: (I) fitting the parameters of the recoil peaks directly to fixed-angle time-of-flight spectral (2) transforming the time-of-flight spectra into fixed-angle y spectra, referred to as the Neutron Compton Profiles, and then fitting the line shape parameters. The present work shows that scattering signals from different fixed-angle detectors can be collected and rebinned to obtain Neutron Compton Profiles at constant wave vector transfer, q, allowing for a suitable interpretation of data in terms of the dynamical structure factor, S(q, w). The current limits of applicability of such a procedure are discussed in terms of the available q-range and relative uncertainties for the VESUVIO experimental set up and of the main approximations involved. (C) 2008 Elsevier B.V. All rights reserved.

Senesi, R., Pietropaolo, A., Andreani, C. (2008). Constant-q data representation in Neutron Compton scattering on the VESUVIO spectrometer. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 594(2), 244-252 [10.1016/j.nima.2008.06.033].

Constant-q data representation in Neutron Compton scattering on the VESUVIO spectrometer

SENESI, ROBERTO;PIETROPAOLO, ANTONINO;ANDREANI, CARLA
2008-01-01

Abstract

Standard data analysis on the VESUVIO spectrometer at ISIS is carried out within the Impulse Approximation framework, making use of the West scaling variable y. The experiments are performed using the time-of-flight technique with the detectors positioned at constant scattering angles. Line shape analysis is routinely performed in the y-scaling framework, using two different (and equivalent) approaches: (I) fitting the parameters of the recoil peaks directly to fixed-angle time-of-flight spectral (2) transforming the time-of-flight spectra into fixed-angle y spectra, referred to as the Neutron Compton Profiles, and then fitting the line shape parameters. The present work shows that scattering signals from different fixed-angle detectors can be collected and rebinned to obtain Neutron Compton Profiles at constant wave vector transfer, q, allowing for a suitable interpretation of data in terms of the dynamical structure factor, S(q, w). The current limits of applicability of such a procedure are discussed in terms of the available q-range and relative uncertainties for the VESUVIO experimental set up and of the main approximations involved. (C) 2008 Elsevier B.V. All rights reserved.
2008
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
deep inelastic neutron scattering; inverse-geometry neutron spectrometers
Senesi, R., Pietropaolo, A., Andreani, C. (2008). Constant-q data representation in Neutron Compton scattering on the VESUVIO spectrometer. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 594(2), 244-252 [10.1016/j.nima.2008.06.033].
Senesi, R; Pietropaolo, A; Andreani, C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/31312
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