Dynamic structure of He-Ne mixtures by MD simulation: from hydrodynamic to fast and slow sound modes

Details Dynamic structure of He-Ne mixtures by MD simulation: from hydrodynamic to fast and slow sound modes Dynamic structure of He-Ne mixtures by MD simulation: from hydrodynamic to fast and slow sound modes

2001-06-07

arxiv.org/abs/cond-mat/0106134v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.88.085502

Molecular dynamics results for the dynamic structure of a He0.77Ne0.23 gas mixture at two densities (15.8 nm-3 and 36.1 nm-3) are presented. A clear description of the crossover from hydrodynamic modes to distinct excitations for the two species is obtained. The higher density data neatly show high- and low-frequency branches setting on in the dispersion curve, with a rather localized transition. The lower density results remarkably agree with existing neutron scattering data and, differently from previous simulation studies, display hydrodynamic behavior up to k = 2 nm-1. A smooth transition to fast sound is shown to take place for 2 < k / nm-1 < 5, where the present MD data fill the existing gap in the experimental results.

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