Abstract
Although it is generally accepted that a sonoluminescing bubble collapses to a volume determined by the van Der Waals hard core of its contents, the size of the light-emitting region remains undetermined. Photos of the hot-spot indicate that the resolution of its size is diffraction limited. Intensity interferometry can resolve smaller sizes as well as the flash width if the light is incoherent. An experiment aimed at exploiting this is underway.
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