Abstract
Prebreakdown disturbances of alipathic liquids in a positive point to plane geometry have been measured using Schlieren techniques. A voltage pulse generator has been triggerd by a ruby giant pulse laser and produced a rectangular voltage of about 50 nsec width. The disturbances are trees in shape in linear chain liquids and globes in branched ones. Prebreakdown luminescence observed by an image intensifier is also a tree in the former but does not appear in the latter. Small amount of N,N′ dimethylaniline in hexane can change a tree for a globular disturbance and suppress the luminescence. The disturbance should be bubbles, because threshold voltages for its appearance in hexane depend on pressures up to 6 bar. The thresholds for the other liquids increase with increasing density and decreasing electron mobility. From results, a positive streamer mechanism in liquids has been discussed.
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