K. Weninger et al., ANGULAR-CORRELATIONS IN SONOLUMINESCENCE - DIAGNOSTIC FOR THE SPHERICITY OF A COLLAPSING BUBBLE, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 54(3), 1996, pp. 2205-2208
Deviations from isotropic emission in sonoluminescence (SL) have been
resolved to about one part per thousand. States with larger dipole com
ponents are characterized by large fluctuations in the intensity of SL
. When dipole components exceed the threshold of detectability their m
agnitude decays on a long time scale. This data can be interpreted as
monitoring the degree of nonsphericity of the bubble collapse that lea
ds to SL.