Abstract
The multibubble sonoluminescence spectra of argon-saturated aqueous salt solutions of alkaline and alkaline earth metals exhibit an intense enhancement of atomic emission with respect to continuum emission with an increase in the hydrostatic pressure and decrease in the solution temperature. It is suggested that ion reduction and metal atom excitation occur in the incandescent liquid layer formed at the liquid/bubble interface during a time interval that is sufficiently short for diffusion. The layer volume and, therefore, the number of “trapped” metal ions increases with an increase in the finite temperature in the cavitation bubble, which is caused by external factors.
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