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We present Rayleigh-Brillouin scattering results of H₂+Ar, H₂+Xe, and He+Xe mixtures that support the existence of fast and slow sound in binary gas mixtures. An experimental dispersion relation of both the fast and slow sound modes is given. The approach to the Gaussian limit is also investigated. An alternative characteristic length scale is used as the scaling parameter of the sound modes. This length scale proved to be a proper choice as a scaling parameter of the dispersion relation of different gas mixtures.
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Schram et al. (1991) studied this question.
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