Abstract
A single-bubble sonoluminescence (SBSL) of the degassed water (60ml) was carried the cylindrical cell made of acrylic resin. A langevin transducer was used as the transmitter. The SL intensity was detected by a photo multiplier tube. The SL was observed in the frequency width of several hundreds Hz, and the SL intensity had a maximum peak at a certain frequency. The frequency at the maximum increased with increasing the concentration of dissolved oxygen (DO). The SBSL was clearly observed below 4mg/l of DO. Over 6mg/l of DO, we could not detect the SBSL. The concentration of NO_2^- depended on the integrated SBSL intensity and was estimated at about 10^<-7>M/hr.
