Hydrodynamic solutions for a sonoluminescing gas bubble

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.