| Autor: |
Islam, Fahima, Lin, Jiao Y. Y., Archibald, Richard, Abernathy, Douglas L., Al-Qasir, Iyad, Campbell, Anne A., Stone, Matthew B., Granroth, Garrett E. |
| Předmět: |
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| Zdroj: |
Review of Scientific Instruments; Oct2019, Vol. 90 Issue 10, pN.PAG-N.PAG, 13p, 1 Diagram, 1 Chart, 6 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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