Abstract
Measurements of ultrasonic absorption have been conducted in liquid dichloromethane over a frequency range of 30 to 510 Mc/sec, and over a temperature range of −60° to 25°C. The relaxation is exceedingly strong. The experimental values are predictable by the assumption that the vibrational specific heat of the molecule is the chief cause of the absorption, if it is assumed that the first vibrational mode is inactive, as hypothesized by Andreae. The frequencies of relaxation, arrived at through a curve of best fit, are 171 Mc/sec at 25°C, 147 Mc/sec at 0°C, and 117 Mc/sec at −60°C. The measured velocity dispersion is in agreement with the magnitude of the relaxing specific heat of vibration.
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