Brillouin and Rayleigh scattering have been studied in a gas mixture of SF₆ and He at various concentrations. A strong coupling exists between the concentration and pressure fluctuations in the mixture that produces a heavy damping of the thermal sound-wave excitations and prevents them from propagating adiabatically. Consequently, a fully coupled solution of the hydrodynamic equations is necessary to describe the spectrum accurately.
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Gornall et al. (1971) studied this question.
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