ABSTRACT
Sonoluminescence was discovered 70 years ago by Frenzel and Schultes (1934). This was light from clouds of bubbles, or multibubble sonoluminescence. After World War II progress was made as mainly described in Chapter 2 with multibubble sonoluminescence. In 1990, after earlier discoveries (see Sec. 3.1), Gaitan and his PhD supervisor Crum (Gaitain et al. (1992)) made the breakthrough which has guided sonoluminescence research ever since. Gaitan and Crum found that they could stably trap a 5 µm bubble at the velocity node of a standing sound wave in a glass flask. They could then control the pressure, temperature, contents and other parameters of the bubble gas that was producing the sonoluminescence.
