Abstract
Sparks in iodine vapour have been studied at pressures between 0.08 and 0.80 Torr, and for gaps of the order of 10 cm. Sparks were initiated in non-uniform fields, using voltage pulses between 1 kV and 3 kV, corresponding to overvoltages of up to 300%. Development of the spark proceeds through a glow phase to a filamentary arc. The glow-arc transition is a two-stage process, involving the formation of a cathode spot, with a corresponding drop in cathode fall voltage, followed by constriction of the positive column, during which molecular dissociation occurs. Following construction, the arc expands radially and a temperature of 5000K and electron density of 6*1012 cm-3 are reached before decay sets in. During spark decay, a transition occurs from an atomic to a molecular arc phase.
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