Abstract
Sound-absorption and -dispersion measurements have been made using the tube method on gas mixtures of carbon dioxide and helium over the temperature range 25° to 191°C. The data obtained indicate a single relaxation-time process, and the maximum absorption per wavelength agreed, within experimental error, with the theoretical values. The reciprocal of the relaxation time of the mixture was found to be a linear function of the mole fraction of helium. The number of CO2/He collisions necessary to de-excite the deformation mode vibration was found to decrease linearly when plotted versus T−13 from 3222 at 25°C to 1376 at 191°C.
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