抄録
Influence of ambient pressure on multibubble sonoluminescence is studied experimentally through the measurements of time dependence of sonoluminescence intensity and time variation of oxygen content in a luminol solution to accomplish high efficiency in chemical reactions. As irradiation time of ultrasound passes at atmospheric case, the intensity increases and decreases monotonously after showing the maximum, while the oxygen content decreases all the way. The intensity and oxygen content at subatmospheric case show the similar changes to the atmospheric ones except that decrease in oxygen content is sharper. From these measurements on the condition of the constant ultrasonic frequency and constant amplitude of sound pressure, it is shown that the intensity of sonoluminescence is higher at reduced case rather than the atmospheric case on the initial irradiation of ultrasound. Also, it is found that there is an appropriate oxygen content to produce the highest intensity of the luminescence.
