Sonoluminescence is a phenomenon where sound in a liquid is transformed into light via one or many bubbles set into strong oscillations by the sound field. The processes inside the bubble leading to light emission are difficult to monitor, in fact, only indirect conclusions can be drawn from the shock waves radiated into the liquid, from the light emission itself and from chemical species that may be formed and found later in the liquid. The interest in Sonoluminescence is high as there are speculations whether, by special arrangements, the processes inside the bubbles may be enhanced up to nuclear reactions. Theoretical considerations and calculations of what may go on inside an oscillating bubble are one approach to arrive at more knowledge about the interior processes. We study the interior of collapsing bubbles by molecular dynamics simulations with up to several million particles. The chosen bubble and acoustic driving parameters correspond to typical conditions of single bubble Sonoluminescence. Bubbles containing a noble gas, noble gas mixtures and gas-vapor mixtures are considered. Mass and heat diffusion, heat conduction across the bubble wall, condensation of vapor at the gas-liquid interface, and dissociation reactions are taken into account. Typical examples of the evolution of temperature and density within the bubble are presented.
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