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Temporal and spatial behaviour of excited-state He atoms in a pulse discharge

The temporal and spatial variations of the population of excited-state He atoms (21S, 21P, and 23S and 23P) in a pulsed discharge of short duration ( approximately 1 mu s) have been studied using the hook method. Though, in general, the populations of these states show a rapid increase immediately after the current ceases, the temporal variation for 23S shows two maxima which are likely to arise from two different processes. The profile of the radial distribution of these states varies with time more rapidly than could be expected from the decay process, due to diffusion to the wall.