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The mechanisms for population inversion among the excited states of He I andNe I in regenerative sooting discharges have been investigated as a function ofthe geometry and the physical parameters of the graphite hollow cathodesources. The effect of the state of sooting of the hollow cathode, the gaspressure and the role of the cycling of the discharge current idis on thepopulation inversion of the excited He I and Ne I levels have beeninvestigated.

Regenerative Soot-VII: Population inversion of He I and Ne I in regenerative sooting discharges