Abstract
Spectra of multibubble sonoluminescence (MBSL) were measured in ethanol solutions at the frequencies of 116 kHz and 1.0 MHz. Ethanol was added to argon-saturated water in the concentration range of 2mM-100mM. The MBSL spectra showed that the quenching of peaks attributed to OH radicals was more efficient than that of broadband spectrum. The concentration dependence of spectrum quenching indicated no frequency dependence. A new peak was observed at 385nm only at small ethanol concentrations and at the frequency of 1.0MHz. This peak was attributed to CH or CN molecule emission. In order to examine the scavenging effect of ethanol on OH radicals, KI oxidation dosimetry was performed. The results showed that the OH radicals still exist at 100mM where complete MBSL quenching occurs.
