NUMERICAL STUDY OF ELECTRONIC IMPACT AND RADIATION IN SONOLUMINESCENCE

A hydrodynamic simulation of pure argon single-bubble sonoluminescence including electron collisional ionization, recombination, and radiati ve energy loss has been performed. We find that near the moment that t he bubble reaches its minimum radius the atoms inside a very thin laye r around the origin of the bubble are strongly ionized, and the light emission occurs nearly simultaneously. Therefore we conclude that mult iple ionization and recombination, which mainly occur in the thin laye r of plasma, play a dramatically important role in the noble gas sonol uminescence. We also find that the temperature and the intensity of lu minescence are not so high as those predicted by previous models, whic h consider only neutral gases.