Abstract
The most recent spectroscopic studies of moving-single bubble sonoluminescence (MSBSL) and multi-bubble sonoluminescence (MBSL) have revealed that hydrated electrons (e aq − ) are generated in MSBSL but absent in MBSL. To explore the mechanism this phenomenon, we numerically simulated the ionization processes in single- and multi-bubble sonoluminescence in aqueous solution of terbium chloride (TbCl3). The results show that the maximum degree of ionization of single-bubble sonoluminescence (SBSL) is approximately 10000 times greater than that of MBSL under certain special physical parameters. The hydrated electrons (e aq − ) formed in SBSL are far greater than those in MBSL provided these electrons are ejected from a bubble into a liquid. Therefore, the quenching of e aq − to SBSL spectrum is stronger than that of the MBSL spectrum. This may be the reason that the trivalent terbium [Tb(III)] ion line intensities from SBSL in the TbCl 3 aqueous solutions with the acceptor of e aq − are stronger than those of TbCl3 aqueous solutions without the acceptor of e aq − , whereas the Tb(III) ion line intensities from MBSL are not variational.
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