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Sonoluminescence occurs when tiny bubbles rilled with noble gas atoms aredriven by a sound wave. Each cycle of the driving field is accompanied by acollapse phase in which the bubble radius decreases rapidly until a short butvery strong light flash is emitted. The spectrum of the light corresponds tovery high temperatures and hints at the presence of a hot plasma core. Whileeveryone accepts that the effect is real, the main energy focussing mechanismis highly controversial. Here we suggest that the heating of the bubble mightbe due to a weak but highly inhomogeneous electric field as it occurs duringrapid bubble deformations [A. Kurcz et al. (submitted)]. It is shown that sucha field couples the quantised motion of the atoms to their electronic states,thereby resulting in very high heating rates.

Quantum Optical Heating in Sonoluminescence Experiments