ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

2aPA2. Probing the unknowns of sonoluminescence.

Bradley P. Barber

Robert Hiller

Ritva Lofstedt

Keith Weninger

Seth Putterman

Phys. Dept., UCLA, Los Angeles, CA 90024

The mechanism whereby a bubble transduces sound into a clocklike stream of picosecond flashes of ultraviolet light is robust, complex, and unknown. A theoretical understanding of the key bubble parameter, its ambient radius, is lacking. An explanation as to why this phenomenon has so far only been seen in water is elusive. In addition, we do not understand why cooling the water dramatically increases the light output or why sonoluminescence is so sensitive to doping with a noble gas. Experimentally, the spectrum has been unable to be followed past 7 electron volts and so the limits of energy concentration which can be achieved with sonoluminescence from a single bubble are not yet measured. In addition to yielding clues experiments in progress will most likely serve to deepen the mystery! [Work supported by the US DOE Division of Advanced Energy Projects; RL is an AT&T Fellow.]