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Evidence of the presence of opticlike collective modes in a liquid from neutron scattering experiments

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posted on 2023-06-07, 19:11 authored by F J Bermejo, J W Taylor, S E McLain, I Bustinduy, John TurnerJohn Turner, M D Ruiz-Martin, C Cabrillo, R Fernandez-Perea
Inelastic neutron scattering data from liquid DF close to the melting point show, in addition to spectra comprising quasielastic and heavily damped acoustic motions, an intense, nondispersive band centered at about 27 meV along with a broader higher energy feature. Observation of the former band provides the first direct verification of the existence within the liquid state of collective opticlike excitations as predicted by molecular dynamics simulations. The latter corresponds to mainly reorientational motions assigned from mode eigenvector analysis carried out by computer simulations.

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Publication status

  • Published

File Version

  • Published version

Journal

Physical Review Letters

ISSN

0031-9007

Issue

23

Volume

96

Page range

235501/1-235501/4

Pages

4.0

Department affiliated with

  • Chemistry Publications

Notes

This paper presents the first experimental determinations of the low and medium energy acoustic and optic-like modes in deuterium fluoride. The observations confirmed both our earlier hypothesis of their existence and predictions by others. International collaboration between JFCT and FJB. JFCT directed the experimental work.

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2016-08-17

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