Abstract
The average pressure inside a sonoluminescing bubble in sulfuric acid has been determined by two independent techniques: (1) plasma diagnostics applied to Ar atom emission lines, and (2) light scattering measurements of bubble radius vs time. For dimly luminescing bubbles, both methods yield intracavity pressures . Upon stronger acoustic driving of the bubble, the sonoluminescence intensity increases 10 000-fold, spectral lines are no longer resolved, and radius vs time measurements yield internal pressures . Implications for a hot inner core are discussed.
- Received 17 August 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.204301
©2006 American Physical Society