The autoionisation width of the 2s2p 3 P 0 level in He I has been determined through measurements of the widths of three different optical transitions, namely 2s2p 3 P 0 -2p3p 3 P e , 2s3p 3 P 0 -'2p3p' 3 D e and 2s2p 3 P 0 -'2p4p' 3 D e giving the results 7.12+or-0.12, 8.36+or-0.08 and 8.32+or-0.15 meV respectively. As a tentative explanation for the extra broadening of transitions with 3 D e states as initial states the authors suggest that 3 D e states but not 3 P e states have an unusually large fine-structure splitting.
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Cederquist et al. (1983) studied this question.
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