Abstract
The radiation from active cathode spots in air and vacuum break arcs was investigated by different experimental techniques: streak camera recording, time-resolved and time-integrated spectroscopy. Spot rotation has been found with two frequencies omega 1=2*105 Hz and omega 2=4-6*107 Hz, and two characteristic radial velocities V1=21 m s-1 and V2=130 m s-1. From spectroscopic measurements, degeneration of the upper excited atom states is deduced, corresponding to a strong non-ideality of the cathode spot plasma with consequences for the particle density (N>1028 m-3).
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