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Title: Super-resolution energy spectra from neutron direct-geometry spectrometers

Abstract

Neutron direct-geometry time-of-flight chopper spectroscopy is instrumental in studying fundamental excitations of vibrational and/or magnetic origin. We report here that techniques in super-resolution optical imagery (which is in real-space) can be adapted to enhance resolution and reduce noise for a neutron spectroscopy (an instrument for mapping excitations in reciprocal space). The procedure to reconstruct super-resolution energy spectra of phonon density of states relies on a realization of multiframe registration, accurate determination of the energy-dependent point spread function, asymmetric nature of instrument resolution broadening, and iterative reconstructions. Applying these methods to phonon density of states data for a graphite sample demonstrates contrast enhancement, noise reduction, and ~5-fold improvement over nominal energy resolution. The data were collected at three different incident energies measured at the wide angular-range chopper spectrometer at the Spallation Neutron Source.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Sharjah, Sharjah (United Arab Emirates)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1607148
Alternate Identifier(s):
OSTI ID: 1570862
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 90; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Spectroscopy; Signal processing; Neutron spectra; Neutron scattering; Resolution enhancement technique; Monte Carlo methods; Spallation neutron source; Carbon based materials; Density of states; Phonons

Citation Formats

Islam, Fahima, Lin, Jiao Y. Y., Archibald, Richard, Abernathy, Douglas L., Al-Qasir, Iyad, Campbell, Anne A., Stone, Matthew B., and Granroth, Garrett E. Super-resolution energy spectra from neutron direct-geometry spectrometers. United States: N. p., 2019. Web. doi:10.1063/1.5116147.
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Islam, Fahima, Lin, Jiao Y. Y., Archibald, Richard, Abernathy, Douglas L., Al-Qasir, Iyad, Campbell, Anne A., Stone, Matthew B., & Granroth, Garrett E. Super-resolution energy spectra from neutron direct-geometry spectrometers. United States. https://doi.org/10.1063/1.5116147
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Islam, Fahima, Lin, Jiao Y. Y., Archibald, Richard, Abernathy, Douglas L., Al-Qasir, Iyad, Campbell, Anne A., Stone, Matthew B., and Granroth, Garrett E. Tue . "Super-resolution energy spectra from neutron direct-geometry spectrometers". United States. https://doi.org/10.1063/1.5116147. https://www.osti.gov/servlets/purl/1607148.
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@article{osti_1607148,
title = {Super-resolution energy spectra from neutron direct-geometry spectrometers},
author = {Islam, Fahima and Lin, Jiao Y. Y. and Archibald, Richard and Abernathy, Douglas L. and Al-Qasir, Iyad and Campbell, Anne A. and Stone, Matthew B. and Granroth, Garrett E.},
abstractNote = {Neutron direct-geometry time-of-flight chopper spectroscopy is instrumental in studying fundamental excitations of vibrational and/or magnetic origin. We report here that techniques in super-resolution optical imagery (which is in real-space) can be adapted to enhance resolution and reduce noise for a neutron spectroscopy (an instrument for mapping excitations in reciprocal space). The procedure to reconstruct super-resolution energy spectra of phonon density of states relies on a realization of multiframe registration, accurate determination of the energy-dependent point spread function, asymmetric nature of instrument resolution broadening, and iterative reconstructions. Applying these methods to phonon density of states data for a graphite sample demonstrates contrast enhancement, noise reduction, and ~5-fold improvement over nominal energy resolution. The data were collected at three different incident energies measured at the wide angular-range chopper spectrometer at the Spallation Neutron Source.},
doi = {10.1063/1.5116147},
journal = {Review of Scientific Instruments},
number = 10,
volume = 90,
place = {United States},
year = {2019},
month = {10}
}
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