Abstract
The intensity and spectra of multibubble sonoluminescence of TbCl3 solutions in water-DMSO mixtures saturated with air and argon are studied. The spectra represent the superposition of the characteristic glow of Tb3+ ions and the continuum of emission of electronically excited products of solvent sonolysis (with H2O*, OH*, and SO2* as main emitters). Abnormal action of DMSO and sulfur dioxide on the characteristic luminescence of Tb3+ ions during sonolysis of aqueous solutions is revealed. These additives enhance the sonoluminescence of water to different extent, quench the sonoluminescence of Tb3+, and differently influence the photoluminescence quantum yield of this ion (DMSO acts as activator, whereas SO2 acts as quencher). Sulfur dioxide quenches the sonoluminescence of Tb3+ much more efficiently than the photoluminescence of Tb3+. The abnormal effect of DMSO on sonoluminescence is most probably due to the quenching action of sulfur dioxide formed during sonolysis of DMSO on Tb3+* ions in cavitation bubbles.
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