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Using pulsed optical excitation we have measured the g factors of twelve hyperfine levels (K=1 through 6) of the A²Σ1/2⁺ state of OH by observation of quantum beats. The results are consistent with Hund's case (b) coupling to within the experimental uncertainty of 0.35% (principally limited by magnetic field calibration). However, the ratios of the g factors of a given hyperfine doublet, which are independent of field and accurate to about 0.15%, show significant discrepancies from theory.
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Lebow et al. (1979) studied this question.
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