The development of high-current transient glow and arc discharges over a wide overvoltage range in a 3 cm uniform-field gap has been investigated in nitrogen, oxygen and mixtures of these gases at sub-atmospheric pressures, using an `Imacon' image converter and an EMI 4-stage image intensifier. Streak photographs have been obtained which show clearly the propagation of luminous fronts in both anode and cathode directions during the development of ionization from the prebreakdown stage of the discharge to the final arc.
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Chalmers et al. (1971) studied this question.
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