The processes of formation and development of spatial non-uniformities of a high-pressure (p = 1 - 4 bar) electrical discharge in a Ne - Xe - HCl excimer gas mixture have been studied experimentally. It has been shown that transformation of the discharge into the constricted state is preceded by the low-current ( ) uniform glow phase. The longitudinal discharge structure which is formed consists of three main regions: a bright cathode sheath glow, dark space and a positive column. A subsequent current increase ( ) leads to local disturbances of cathode electron emission and a change in the discharge structure as a whole. The dynamics of the development of non-uniformities is described as well as its dependence on the discharge driving conditions. It has been demonstrated that the current reversal in the oscillating pumping regime is accompanied by the creation of a depleted zone near a newly formed cathode.
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Makarov et al. (1996) studied this question.
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