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