Inversions in the population of excited levels in hydrogen and He II were observed in the FM-1 spherator. The inversion increases strongly as the ratio of the decay time of the electron temperature to the decay time of the electron density was decreased. Time-dependent numerical calculations of the populations were in good agreement with the experimental measurements. More general calculations for high-Z hydrogenlike ions are discussed.
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Suckewer et al. (1976) studied this question.
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