Measurement of pulse width of sonoluminescing gas bubble in sulfuric acid solution

The pulse widths of sonoluminescing gas bubbles in a sulfuric acid solution were precisely measured by using the time-correlated single-photon counting method, which has not been attempted previously. The pulse widths, which are dependent on the size of the bubble at the collapse point were measured and found to be in the range of 165 ps to several ns. The value of the pulse width calculated by assuming thermal bremsstrahlung as the emission mechanism of the sonoluminescence was found to be larger than the observed value by an order of magnitude.