Sound Dispersion in Halo-Methane Mixtures

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Abstract
Results of studies of the dispersion of ultrasound in mixtures of CHClF2 in CF4 and of CHCl2F in CClF3 at various concentrations are presented. In none of the eight mixtures studied is there evidence of multiple dispersion; each mixture exhibited a single relaxation time which falls between the relaxation times of the pure constituents. A simple method of averaging the various quantities entering into the prediction of collision lifetimes in the pure constituents is presented which yields lifetimes for the mixtures nearly matching those found by experiment.

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