Sonoluminescence spectra from nonaqueous liquids under a variety of gases are presented. Ultrasonic irradiation of alkanes under Ar leads to emission from C2, C2H, and CH. When nitrogen is present, emission is seen from CN. When oxygen is present, emission from CO2, CH, and OH is observed. Ultrasonic irradiation of tetrachloroethylene or CC14 leads to emission from Cl2. The intensity of sonoluminescence decreases as the liquid vapor pressure increases. The properties of the dissolved gas also influence the sonoluminescence observed. Sonoluminescence is caused by chemical reactions of high energy species formed during cavitational collapse. It is a form of chemiluminescence. The principal source of sonoluminescence is not blackbody radiation or electrical discharge.
ASJC Scopus subject areas
- Colloid and Surface Chemistry