The 3Σu−←3Σg− transition of S2 has been observed in absorption in Ne and in fluorescence in Ne, Ar, Kr, Xe, and N2 matrices. The strongest bands observed in fluorescence belong to the (0, v″) progression as the result of rapid vibrational deexcitation of the 3Σu− state. T00=31 680, 31 350, 30 900, 30 780, and 31 480 cm−1, respectively, for S2 in the five matrices. Unlike the other matrices, argon yields very sharp fluorescent bands, having a width of 15 cm−1. The frequency of the forbidden infrared vibration transition has been calculated from the fluorescent data, and is found to differ from the observed infrared spectrum.
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Brewer et al. (1966) studied this question.
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