Spectroscopy of a cavitating liquid in the optical and X-ray spectral ranges

Results of spectroscopic investigation of a multibubble sonoluminescence and a hydrodynamic luminescence of glycerol in the optical range between 400 and 700 nm and in the X-ray spectral interval between 1 and 70 keV are presented. Continuous spectrum the shape of which is sufficiently well described by the normal distribution with respect to photon energy was obtained for both sono- and hydroluminescence in the optical spectral range. Based on the identity of the spectra, a conclusion can be drawn that the effects of the sono- and hydroluminescence are of the same physical nature. The shape of the obtained spectra suggests that the observed glow of a liquid under mechanical action represents fluorescence of only one type of centers in a condensed medium. X-ray radiation is absent in the specified energy range. Although an X-ray spectrometer detects some a signal of some kind, in reality, this turns out to be noise created by the magnetostrictive transducer of an ultrasonic generator.