Population inversion, which occurs in a recombining plasma when a stationary He plasma is brought intocontact with a neutral gas, is examined. With hydrogen as a contact gas, noticeable inversion between low-lying levels of H has been found. The overpopulation density is of the order of 10(8) cm(-3), which is much higher than that ( approximately 10(5) cm(-3)) obtained previously with He as a contact gas. Relations between these experimental results and the conditions for population inversion are discussed with the CR model.
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Masamoto Otsuka (1980) studied this question.
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