Abstract
The HRB technique which is useful for measurement of ultrasonic properties is briefly reviewed. This technique observes the k-spectrum of sound by light scattering and optical beat detection of the scattered light, yielding velocity and absorption over a frequency range from 50 MHz to 1.5 GHz. Studies were made on ultrasonic relaxation phenomena in carbondisulfide and in a mixture system of furan and cyclohexane. Brief discussion is given on the mechanism of vibrational relaxation in these liquids.
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