\begin{abstract}
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.
\end{abstract}