Hydrodynamic Solutions for a Sonoluminescing Gas Bubble

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Abstract
Analytic solutions for a sonoluminescing gas bubble have been obtained, which provide density, pressure, and temperature distributions for the gas inside a bubble oscillating under an ultrasonic field. The solutions show that sonoluminescence occurs due to the increase and subsequent decrease in bubble wall acceleration which induces a thermal spike. It also turns out that the number of electrons ionized, the ion species, and the kinetic energy of the electrons affect crucially the spectrum of the light emitted.