Extreme Electrostatic Phenomena in a Single Sonoluminescing Bubble

A multihydrodynamic model is established to simulate a sonoluminescing argon bubble. The results show that a partially ionized plasma layer is generated and contributes to the flash by assumed thermal bremsstrahlung. A strong electric field of up to $2\times {10}^{10}\mathrm{V}/\mathrm{m}$, caused by the plasma dipole diffusion, emerges along the shock front. The spike of the electric field helps prevent the occurrence of Rayleigh-Taylor instability and thus maintains perfect spherical symmetry of the shocks. This may be a key reason for the over 12 orders of magnitude sound-energy concentration.