Abstract
THE low-lying states of N2 and of CO arise from electron configurations1 which may be written: In the group of molecules from CO to PbTe, the allowed absorption bands of longest wave-length may then be expected to be 1Σ+, 1π – X 1Σ+. This is found to be the case, for example, in SiS, where the systems D 1Π – X 1Σ+ and E 1Σ+ – X 1Σ+ appear readily in absorption2,3. In addition, evidence about some other predicted states, notably e 3Σ−, I 1Σ− and (?)1Δ, has been obtained from work4,5 on the perturbations in D 1Π. In SiO, GeO and SnO there is no further strong absorption6 until wave-lengths considerably shorter than those corresponding to the E – X systems, indicating that more highly excited orbitals than (2) or (3) are here involved.
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BARROW, R., DEUTSCH, J. & TRAVIS, D. Rotational Analysis of Absorption Bands of Lead Monoxide. Nature 191, 374–375 (1961). https://doi.org/10.1038/191374b0
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DOI: https://doi.org/10.1038/191374b0
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