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- W2085157099 abstract "High‐resolution intracavity dye laser spectroscopy has been used to obtain sub‐Doppler spectra of transitions to 350 rotational levels in the 410 band of the à 1A2–X̃ 1A1 electronic transition of thioformaldehyde. Ground state combination differences from the sub‐Doppler spectra, combined with microwave and infrared data, have been used to improve the ground state rotational and centrifugal distortion constants of H2CS. The upper state shows a remarkable number of perturbations. The largest of these are caused by nearby triplet levels, with matrix elements of 0.05–0.15 cm−1. A particularly clear singlet–triplet avoided crossing in Ka’ = 7 has been shown to be caused by interaction with the F1 component of the 3162 vibrational level of the ã 3A2 state. At least 53% of the S1 levels show evidence of very small perturbations by high rovibronic levels of the ground state. The number of such perturbations is small at low J, but increases rapidly beyond J=5 such that 40%–80% of the observed S1 levels of any given J are perturbed by ground state levels. Model calculations show that the density and J dependence of the number of perturbed levels can be explained if there is extensive rotation‐induced mixing of the vibrational levels in the ground state." @default.
- W2085157099 created "2016-06-24" @default.
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- W2085157099 date "1994-11-01" @default.
- W2085157099 modified "2023-10-04" @default.
- W2085157099 title "Sub‐Doppler spectroscopy of thioformaldehyde: Excited state perturbations and evidence for rotation‐induced vibrational mixing in the ground state" @default.
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- W2085157099 doi "https://doi.org/10.1063/1.468287" @default.
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