Abstract
When a gas bubble is acoustically levitated in a standing wave, the spherically symmetric volume oscillations can readily couple into surface waves [M. Strasberg and T. B. Benjamin, J. Acoust. Soc. Am. 30, 697 (1958)]. Using a light scattering technique, the threshold for inception of individual surface waves was examined and the results were compared with both analytical and numerical calculations of this threshold. The observed and calculated values are generally in agreement although the identity of the surface wave mode is difficult to determine. [Work supported in part by the Office of Naval Research.]
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