Measurements of ionization of a gas by radiation from the positive column of a glow discharge indicated that ionizing radiation is produced primarily by collision processes rather than by recombination. The ratio of ions produced by radiation to ions produced in the discharge is plotted as a function of distance from the discharge for oxygen, nitrogen, and air. Application of these data to the initiation of positive corona can account for the observed corona starting voltage.
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Penney et al. (1963) studied this question.
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