The Taleyarkhan group claims to have generated nuclear fusion via this process.  
Detailed measurements of this phenomenon have been made by Barber and Putterman by measuring Mie [MEE] scattering.  Most scientists have rejected Julian Schwinger's explanation of this in terms of emission of zero-point energy.  The first experimental observation of this process was made in 1934 by Frenzel and Schultes, and interest in this effect was renewed by a discovery of a special form of it in 1990 by Felipe Gaitan. The Taleyarkhan group claims to have generated nuclear fusion via this process.  Although the mechanism for it is still controversial, most believe that the observed radiation is due to bremsstrahlung that is produced by an in-falling shockwave caused by the collapse of an object that may be produced by cavitation.  For 10 points, identify this process in which sound waves are passed through a liquid, causing bubbles to collapse and emit short bursts of light.
Detailed measurements of this phenomenon have been made by Barber and Putterman by measuring Mie [MEE] scattering.  
sonoluminescence