Experimental profiles have been obtained at electron densities of the order of 10 16 cm -3 of the helium II 3023 AA transition, of two isolated He I lines ( lambda lambda 3965 and 2945) and of the important He I lambda 4471 transition and nearby forbidden component. Comparison with theory shows good agreement for the He II and isolated He I lines, but the discrepancy in the profile of He I lambda 4771 near the 2 3 P-4 3 F forbidden component can only partly be accounted for by density inhomogeneities in the source.
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Jenkins et al. (1971) studied this question.
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