Abstract
Spectra of moving single-bubble sonoluminescence have been obtained for trichloride solutions of Sm, Tm and Yb in water and ethylene glycol. In addition to continuum solvent, the spectrum of Sm3+ salt in ethylene glycol contains a wide luminescence maximum at 754 nm. This maximum is related to 4f55d → 4f6 radiative transition *Sm2+ → Sm2+ + hν. Based on the analysis of available data on the nature of sonoluminescence of different lanthanide ions and the influence of the H+ electron acceptor on it, it is concluded that *Sm2+ formed by reduction of Sm3+ by electron solvated in ethylene glycol. The latter is generated during the solvent sonolysis. The formation and sonochemiluminescence of *Tm2+ and *Yb2+ under the same conditions of sonolysis was not found. Analysis of published literature shows that this new discovered example of generation and light emission of *Men + metal ion upon reduction of Me(n+1)+ by solvated electron, apparently, is a general phenomenon for transition metals if the reduction reaction energy is sufficient for electronic excitation of Men+.
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