Abstract
Several recent measurements of the fine-structure intervals in the 3 /sup 3/P state of /sup 4/He are compared, and the best values are recommended: the 3 /sup 3/P/sub 0/-3 /sup 3/P/sub 2/ interval is 8772.552 (40) MHz (as given by Kramer and Pipkin), and the 3 /sup 3/P/sub 1/-3 /sup 3/P/sub 2/ interval is 658.67 (9) MHz (which is a weighted average of results by Kramer and Pipkin, by Tam, and by Wieder and Lamb). Also examined are the presently available experimental data on lifetime and depolarization cross section of the 3 /sup 3/P state, and the current theoretical understanding of the fine structure of this state.
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