The ratio of intensities of the first negative system and the second positive system of nitrogen as a function of the electric field strength was experimentally determined in atmospheric-pressure air. The non-self-sustained discharge was excited in a parallel-plane gap using the radiation of a pulsed laser. The field strength was varied in the range of 135–285 Td. The peculiarities of the measurement and data processing of signals of very low intensity are described. The results are compared with the theoretical predictions of other authors.
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Paris et al. (2004) studied this question.
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