Abstract
Magnetic rotation spectroscopy provides a sensitive method for probing singlet—triplet perturbations in the spectra of simple polyatomic molecules. The sensitivity of the method depends on the magnetic moment conferred by the triplet component of a mixed wavefunction and the transition moment conferred by the singlet component. High resolution magnetic rotation spectra have been obtained for the 4 1 0,4 3 0,2 1 04 1 0,2 1 0,4 3 0,2 2 04 1 0,2 2 04 3 0 and 2 3 04 3 0 bands of H 2CO, the 4 1 0 and 4 3 0 bands of D 2CO and the 4 0 0 and 4 1 0 bands of H 2CS. The singlet rotational levels which are perturbed by triplet levels have been identified for each of the excited vibronic states. The perturbations in the 4 3 0 band of H 2CO are particularly interesting since a complete interpretation of the quantum numbers of the perturbing triplet levels can be given; the magnitudes of the perturbing matrix elements can also be evaluated.
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