Abstract

The development of initial spark channels and optical phenomena related to initial electrode processes in a 4000-A spark discharge, of 20-nsec duration, in 1 atm air, gap 0.85 mm, was photographed through a Kerr cell shutter. Directed flares originating from the anode spark appear to form after current cutoff and are tentatively identified as an explosive type of erosion which was predicted.

© 1967 Optical Society of America

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