Pulsed light scattering off of a gas bubble trapped in a fluid by a strong sound field indicates that ‘sonoluminescence’ is accompannied by a high Mach number implosion of the bubble's wall. Although these measurements support the imploding shock wave model of sonoluminescence there remain many unknowns including the effects of impurities, fluid temperature, noble gas doping as well as the bubble size and light–emitting mechanism.
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Barber et al. (1997) studied this question.
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