Abstract
The ultrasonic velocity and absorption were measured over the frequency range from 3 MHz to 5 GHz at 20° and 30°C in liquid cis and trans-dichloroethylene. Two relaxation regions were found in the velocity-dispersion spectrum of trans-dichloroethylene, one centered at 450 MHz and the other around 20 GHz, and were analyzed in terms of vibrational-translational relaxation effect. All the fundamental vibrational modes of this molecule are categorized into two groups with different relaxation times of ∼10 ps and 430 ps. The relaxation was found also in cis-dichloroethylene.
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