  We measured the timing of sonoluminescence by observing laser light scattered
from a single sonoluminescing bubble. We performed this measurement on 23.5
kHz, 17.8 kHz, 13.28 kHz and 7920 Hz systems, and found that the flash
typically occurs 100 nanoseconds before the minimum radius. These results
motivate a new model of sonoluminescence: the flash results from the discharge
of an excited cold condensate formed during the adiabatic expansion of the
bubble.
