Abstract
A weak rotationally resolved absorption band of 12C 18O has been identified from photographic VUV spectra and assigned to the k 3Π ( v = 3) ← X 1Σ + ( v = 0) forbidden transition. The experimentally determined band origin and upper state rotational constant are in close agreement to that derived from isotopic scaling. A consideration of the intensity structure of the band suggests that the band gains its intensity mainly through a k 3Π ( v = 3)–E 1Π ( v = 0) interaction. This is the first direct observation of the k 3Π state for 12C 18O.
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