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Abstract
A new ultrasonic resonator method is described for measuring absorption in the frequency range 0.1-1.5 MHz in liquids. The method uses a plano-concave resonator with 56 mm diameter which shows high-Q characteristics enabling absorption measurements down to 0.1 MHz to be carried out. A resonance spectrum is detected using Raman-Nath light diffraction instead of the quartz transducer. The results in water and benzene demonstrate the resolution of the apparatus. Absorption spectra of methyl and ethyl formate are presented.
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