Product energy disposal in the nonadiabatic reaction S(1D)+CS2→S2 (X 3Σ−g)+CS (X 1Σ+)

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Abstract
The product energy disposal in the reaction S(1D)+CS2→S2+CS is measured via laser-induced fluorescence. Molecular sulphur is produced exclusively in its electronic ground state (3Σ−g) with up to 3 quanta of vibrational excitation and rotational excitation that roughly approximates a 1000 K Boltzmann distribution. The CS produced from the reaction is formed predominantly in its vibrationless state. The total internal energy content of the product molecular sulphur is only about 12% of the total available energy of the reaction; the CS fragment also has minimal internal energy, implying that most of the reaction energy resides in product translation. These results are different from those observed in the isovalent S+OCS reaction and suggest that a different detailed mechanism is operative.