Theory of Light Emission in Sonoluminescence as Thermal Radiation

摘要

Based on the model proposed by Hilgenfeldt {\it at al.} [Nature {\bf 398},401 (1999)], we present here a comprehensive theory of thermal radiation insingle-bubble sonoluminescence (SBSL). We first invoke the generalizedKirchhoff's law to obtain the thermal emissivity from the absorptioncross-section of a multilayered sphere (MLS). A sonoluminescing bubble, whoseinternal structure is determined from hydrodynamic simulations, is thenmodelled as a MLS and in turn the thermal radiation is evaluated. Numericalresults obtained from simulations for argon bubbles show that our theorysuccessfully captures the major features observed in SBSL experiments.