On the Elastic Relaxation in Carbon Disulfide: The Temperature Dependence of the Ultrasonic Absorption Coefficient

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Abstract
The experimental values of the ultrasonic absorption coefficient given in the literature for carbon disulfide show the presence of dispersion in the frequency range 1–100 Mc/sec, but large differences are present in the values obtained by various authors at the same frequencies so that it is difficult to analyze the behavior of this liquid. In order to discriminate among the various results more information is needed. For this reason a measurement of the absorption coefficient was performed at 30 Mc/sec. The value obtained for α is in agreement with the higher values of the absorption coefficient obtained by other authors at various frequencies and, therefore, it gives more credence to them in comparison with others. The absorption coefficient as a function of temperature does not follow a linear law as it does in other unassociated liquids. The temperature coefficient (1/α)(∂α/∂t) goes from 7.3·10−3 deg−1 at −23°C to almost zero near the boiling point. These results can be used to examine the theoretical explanations of absorption in carbon disulfide based on the assumption that all the vibrational modes relax together or on the hypothesis that they have different relaxation times. The value of the temperature coefficient at 25°C seems to be better explained with the first treatment.

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