The condition of the gas breakdown is investigated. Two distinct types were found. One is accompanied with a full production and subsequent contraction of plasma; in the other are glow discharges without the full plasma production. The former was observed by photomultiplier measurement of the light intensity, high-speed camera observation of the plasma contraction, and the particular deviation and enhanced decay rate of the voltage oscillogram from the natural one.
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Uchida et al. (1962) studied this question.
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