Abstract
The dispersion relation for disparate mass gas mixtures is derived from a simplified two-temperature model. It is shown that the hydrodynamic sound mode ( kl→0) goes over continuously into either a fast or a slow propagating sound mode ( kl→∞), depending on the composition. The composition that demarcates the composition regions where the continuation of the hydrodynamic sound mode is a fast or slow propagating mode is called the critical co composition. The existence of such a critical composition is confirmed experimentally by new Rayleigh-Brillouin experiments on H 2 + Xe mixtures.
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