Chemical Reactions in a Sonoluminescing Bubble

Rates of chemical reactions in an air bubble are calculated numerically under a condition of the single-bubble sonoluminescence (SBSL) and that of non-light-emission. In the calculations, effect of non-equilibrium evaporation and condensation of water vapor at the bubble wall and that of thermal conduction both inside and outside the bubble are taken into account. Numerical calculations reveal that appreciable amounts of OH, H 2 O 2 , HO 2 , O 3 , H 2 , H, and O molecules are created in a bubble under the condition of SBSL. The amounts of chemical products containing nitrogen such as NO x , NH x , and HNO x are much less than those of the above products at least in the first few acoustic cycles. Numerical calculations also reveal that no chemical reactions take place under a condition of non-light-emission. Connection with sonoluminescence is also discussed.