Singlet–triplet perturbations in the à 1A2 (v=0) state of thioformaldehyde

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Abstract
Extensive singlet–triplet perturbations have been observed in the 0–0 band of the à 1A2–X̃ 1A1 system of H2CS with energy displacements up to about 0.4 cm−1. The singlet–triplet nature of the perturbation has been confirmed by high resolution magnetic rotation studies and by laser excitation studies in the presence of a magnetic field. The J and Ka dependence of the perturbation matrix elements has been shown to be consistent with a vibronic spin-orbit mechanism. The coupling is predominantly to the F1 components of the 4361 level of the ã 3A2 state.