Abstract
Sonoluminescent bubbles constitute a new kind of microparticles, which cavitate (expand and collapse) due to sound action, with remarkable properties of light radiation. The observation of sonoluminescence in bubbles has opened an active research on a phenomenon of light radiation by sound conversion. Experiments have been performed on emission spectra, estimation of the bubble size by light scattering, assessment of the shape and its possible departure from dipole radiation angular correlations, and concerning the reactive nature of the gas inside the bubble. Several theories have been put forward, like e.g.: those that support the sphericity of the bubble; those that establish that it is actually non spherical, the emission being due to a jet implosion in which one half of the bubble collapses into the other half ; models to explain the dipole strength of a surrounding stream as experimentally observed ; and suggestions that the emission should rather originate in the liquid enclosing the bubble. However, the key problem of determining the size and shape of the bubble at the interval (50 ps) of emission has only recently been solved. Angular correlations from intensity measurements of the detected so- noluminescent flashes, diffracted by the bubble surface at the emission instant have been reported. We review here the theory on the angular distribution of the light emitted from several bubble shapes and sizes. This allows to establish which one matches with the experiments. For instance, it is found that an ellipsoidal shape of 1:5 to 2 μm and eccentricity 0:2 exhibits an excellent agreement with the existing data at all ranges of wavelengths.
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Madrazo, A., Nieto-Vesperinas, M., García, N. (2000). The Angular Distribution of Light Emitted by Sonoluminescent Bubbles. In: Moreno, F., González, F. (eds) Light Scattering from Microstructures. Lecture Notes in Physics, vol 534. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-46614-2_15
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DOI: https://doi.org/10.1007/3-540-46614-2_15
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