Effect of argon on the multibubble sonoluminescence of cerium,terbium, and dysprosium trichlorides

The ultrasonic (20 kHz) multibubble sonoluminescence spectra of aqueous air- or argon-saturated solutions of CeCl₃, TbCl₃, and DyCl₃ were obtained. Saturation with argon leads to the intensity redistribution in the spectrum of the continuum with an increase in its short-wavelength part and increases the intensity of the characteristic emission of Ce³⁺ and Tb³⁺ due to the enhancement of the sonophotoluminescence intensity, i.e., the re-emission of the absorbed part of the continuum by these ions. The Ce³⁺, Tb³⁺, and Dy³⁺ ions quench the OH* emission at 310 nm with a qualitative correlation between the degree of quenching and the standard redox potentials of the pairs Ln^IV/Ln^III. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1797–1802, September, 2008.