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

Bermejo, F J, Taylor, J W, McLain, S E, Bustinduy, I, Turner, J F C, Ruiz-Martin, M D, Cabrillo, C and Fernandez-Perea, R (2006) Evidence of the presence of opticlike collective modes in a liquid from neutron scattering experiments. Physical Review Letters, 96 (23). 235501/1-235501/4. ISSN 0031-9007

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Abstract

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.

Item Type: Article
Additional Information: 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.
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: John Turner
Date Deposited: 06 Feb 2012 18:11
Last Modified: 13 Mar 2017 23:32
URI: http://sro.sussex.ac.uk/id/eprint/15174

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