Abstract
THE longest wave-length allowed absorption bands of the molecules in the group CO to PbTe arise from the transitions – – – π4σπ, 1∏⇆X 1Σ+ and – – – π3σ2π, 1Σ+←X 1Σ+. In the case of stannous oxide (SnO), rotational analysis of bands of the D – X system1 (T00 = 29,505 cm−1) has shown that the transition is indeed 1∏ – 1Σ+, and although no analysis of the rotational structure of the E – X system2 (T00 = 36,138 cm−1) has yet been reported, the corresponding system in SnS is known3 to be 1Σ+ – 1Σ+. However, for CO, where long absorption paths may be obtained without difficulty, forbidden transitions from the ground-state to many of the states arising from – – – π4σπ and – – – π3σ2π are known, and absorption bands involving the case-c analogues of these states are quite strong in molecules like PbO4 and PbS5. These systems are weaker in SnO and SnS, but at least three low-lying excited states have been recognized3 in SnS.
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DEUTSCH, E., BARROW, R. Rotational Analysis of Bands of the 3∏ – X 1Σ+ System of Stannous Oxide. Nature 201, 815 (1964). https://doi.org/10.1038/201815a0
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DOI: https://doi.org/10.1038/201815a0
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