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The analysis of the first observed singlet transition ( Sigma - Sigma ) of Si 2 is reported. The lower state of this transition is identified with the lowest 1 Sigma g + state derived from the ( pi u 3p) 4 configuration. New bands are also reported for the two H 3 Sigma u - -X 3 Sigma g - and the K 3 Sigma u - -X 3 Sigma g - transitions.
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Dubois et al. (1981) studied this question.
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