Calculation of sonoluminescence temporal pulse shape and spectra

A nonuniform and nonadiabatic model has been developed to investigate the g as dynamics within a bubble of sonoluminescence. The model uses the diffusi on approximation to study the radiative transport mechanism of single-bubbl e sonoluminescence( SBSL). By simultaneously solving the radiative transfer equations and hydrodynamic equations which are intimately coupled, we obta in the radiation field and thermodynamic field distribution. The results sh ow that during the light emission, the bubble is neither a pure optically-t hick, nor a pure optically-thin medium, but is just between the two, so onl y by employing the diffusion approximation to solve the radiative transfer equations we can obtain a correct qualitative analysis and comparatively ac curate quantitative results. The calculations show that the radiative trans port mechanism plays a key role in determining the optical characteristics of SBSL, such as emission intensity, flash pulse shape, emission spectrum, etc. The results are consistent with recent experiments of correlated singl e photon counting of SBSL.