Microscopic Dynamics in Dense Helium-Neon Mixtures: Neutron Scattering, KineticTheory and Computer Simulations

摘要

The microscopic dynamics in eleven dense helium-neon gas mixtures is investigatedby means of neutron scattering, kinetic theory and computer simulations. The concentration ratio of helium in the mixture is varied from 0 to 1 at temperatures of 39 and 47 K and pressures between 114 bar and 285 bar. The study is made by considering the partial and total dynamic structure factors of the mixture. The question is addressed how the behavior of two fundamental quantities in simple dense noble gas fluids, that is, the decay frequency of microscopic density fluctuations and the sound dispersion of small scale sound oscillations extend to the simplest of all binary mixtures: He-Ne.