Comparison of Xe single bubble sonoluminescence in water and sulfuric acid

摘要

Using the equations of fluid mechanics with proper boundary conditions and taking account of the gas properties, we can numerically simulate the process of single bubble sonoluminescence, in which electron-neutral atom bremsstrahlung, electron-ion bremsstrahlung and recombination radiation, and the radiative attachment of electrons to atoms and molecules contribute to the light emission. The calculation can quantitatively or qualitatively interpret the experimentalrn results. We find that the accumulated heat energy inside the compressed gas bubble is mostly consumed by the chemicalrn reaction, therefore, the maximum degree of ionization inside Xe bubble in water is much lower than that in sulfuricrn acid, of which the vapour pressure is very low. In addition, in sulfuric acid much larger pa and R0 are allowed whichrn makes the bubbles in it much brighter than that in water.