Abstract
The visible absorption band systems of Cl 2CS have been reexamined using laser fluorescence excitation and magnetic rotation spectroscopy. Since the former is sensitive only to S 1 ← S 0 transitions and the latter primarily to T 1 ← S 0 transition, the spin multiplicities of the features in the overlapping singlet and triplet systems could be unambiguously determined. Analyses of the spectra gave new values for ν′ 6 = 189 cm −1 in the A ̃ state and ν′ 1 = 923 cm −1 in the a ̃ state. Bands with types A and C polarization were found to occur only very weakly in the A ̃ ← X ̃ spectrum in marked contrast to the corresponding system in the prototype thiocarbonyl compound, H 2CS.
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