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Three band systems of Si 2 have been found in absorption with a flash photolysis apparatus. Two of the band systems at 3200 and 2100 Å are new, whereas the third is an extension of the 3 Σ– 3 Σ system observed by Douglas in emission. All three systems have the same lower state and arise from [Formula: see text] transitions. It is very probable that the [Formula: see text] state is the ground state of the Si 0 molecule. Rotational and vibrational constants of all four 3 Σ states have been determined. The dissociation energy of Si 2 is estimated to be 3.0 ± 0.2 ev.
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Verma et al. (1963) studied this question.
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