Preliminary results from rotational analysis of new high-resolution spectra of the A 3 Π–X 3 Σ − transition of OH + and OD + are reported. The line assignments for low rotational quantum numbers given by previous authors have been found to be in error by up to 10 cm −1 . Various irregularities in the Λ doubling of the A 3 Π state can probably be explained by strong interaction between the b 1 Σ + and A 3 Π states. An analysis of rotational perturbations in the bands of OH + suggests that the b 1 Σ + electronic state lies about 1200 ± 50 cm −1 above the A 3 Π state.
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Merer et al. (1969) studied this question.