Ultrasonic Absorption in Naphthalene Single Crystals at Low Temperatures

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Abstract
The attenuation of ultrasonic waves was measured in single crystals of naphthalene from 23° to −185°C for frequencies from 15 to 45 MHz. A maximum was observed in the absorption coefficient at low temperatures, and from the frequency dependence of the absorption, the result was examined in terms of relaxation phenomena. The experimental results are compared to the relaxation maximum predicted by the Liebermann theory assuming the temperature-cubed term of the transition probability to be the dominant temperature dependence. The transition probability is calculated from the experimental data and compared directly to the theoretical values. Also, a transition probability with exponential temperature dependence is shown to agree equally as well with the experimental results.

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