New measurements of the structure of the green lines of Mn I combined with the data already available make possible a determination of 24 hyperfine interval factors. Interval factor formulas derived by the method of energy sums are in reasonable accord with much of the data. This permits an approximate determination of the nuclear magnetic moment of Mn⁵⁵, which is found to be 3.0 nuclear magnetons.
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Fisher et al. (1939) studied this question.