The hyperfine structure of the lines λλ8761, 4593, 4555, 3889 and 3877 of the arc spectrum of caesium were observed with a Fabry-Perot etalon. The interval factors for the 6²S1/2, 6²P1/2, 7²P1/2, and 8²P1/2 states were found to be 0.0767, 0.00925, 0.00329, and 0.0017 cm^-1, respectively. Assuming a nuclear spin of 7/2, the nuclear magnetic moments calculated from Goudsmit's formulas were 2.66, 2.38, 2.62, and 3.01 nuclear magnetons for the respective states.
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Granath et al. (1935) studied this question.
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