PhysRevLett.96.235501.pdf (403.54 kB)
Evidence of the presence of opticlike collective modes in a liquid from neutron scattering experiments
journal contributionposted 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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JournalPhysical Review Letters
Department affiliated with
- Chemistry Publications
NotesThis 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.
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