The use of alternating voltages in the study of pre-breakdown processes in fluorocarbon liquids has enabled frequency-dependent effects to be identified with the cavitation process. Acoustic and optical techniques have shown that the events leading to breakdown are intimately connected with stress-induced cavitation in these liquids. The necessary nucleation has been discussed in terms of particle contamination and shock wave propagation in the liquid and suggestions are made concerning the nature of the pre-breakdown light emission.
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