期刊
JOURNAL OF CHEMICAL PHYSICS
卷 114, 期 5, 页码 2259-2267出版社
AIP Publishing
DOI: 10.1063/1.1334613
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The high frequency behavior of the dynamic structure factor, S(Q,omega), of liquid and supercritical neon is investigated by inelastic x-ray scattering at different temperatures and pressure. The spectral evolution is described in terms of a single-relaxation-time viscoelastic model. The occurrence of a positive dispersion in the sound velocity is clearly visible in both investigated thermodynamic phases. The anomalies in the dispersive behavior deeply reduce at the higher temperatures, probably, as a consequence of important changes in the first shell interactions. More generally, the atomic dynamics is dominated by a relaxation process whose time scale is in the range of fast microscopic degrees of freedom (approximate to 10(-13) s), and whose strength and typical time scale stay constant over all the explored liquid and supercritical regions. (C) 2001 American Institute of Physics.
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