A refined hydrochemical model for single-bubble sonoluminescence (SBSL) ispresented. The processes of water vapor evaporation and condensation, massdiffusion, and chemical reactions are taken into account. Numerical simulationsof Xe-, Ar- and He-filled bubbles are carried out. The results show that thetrapped water vapor in conjunction with its endothermic chemical reactionssignificantly reduces the temperature within the bubble so that the degrees ofionization are generally very low. The chemical radicals generated from watervapor are shown to play an increasingly important role in the light emissionfrom Xe to He bubbles. Light spectra and pulses are then computed from anoptically thin model. It is found that the resulting spectrum intensities aretoo small and the pulse widths are too short to fit to recent experimentalresults within stable SBSL range. Addition of a finite-size blackbody core tothe optically thin model improves the fitting. Suggestions on how to reconcilethe conflict are given.
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