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J Mol Spectrosc. 1997 Oct;185(2):356-69.

Intensity Measurements of Deltal > 1 Transitions of Several Isotopomers of HCN

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The intensities of the forbidden Q-branch transitions 02(2f)0-00(0)0, 12(2f)0-00(0)0, and 02(2f)1-00(0)0 for HCN have been measured. The intensities of the 02(2f)0-00(0)0 transitions of DCN, D13C15N, and H12C15N were also measured, as well as the 02(2f)1-00(0)0 transitions of H12C15N and H13C15N. These Q-branch transitions are forbidden even when the effects of l-type resonance are considered so they must get their intensity from some other Coriolis interactions. The much stronger P- and R-branch lines for the e levels of these same vibrational transitions were also measured and they are shown to get most of their intensity from l-type resonance. However, the same Coriolis resonance that gives intensity to the Q-branch transitions seems to affect the DeltaJ = ±1 transitions as shown by the difference in the intensities of the DeltaJ = +1 and DeltaJ = -1 transitions. Measurements of the intensity of the 03(3e)0-00(0)0 and 03(3f)0-00(0)0 transitions shows that they derive most, but perhaps not all, of their intensity from l-type resonance. An unsuccessful search for forbidden DeltaJ = 0, e-e transitions for the strong 10(0)0-00(0)0 band shows that there is no detectable mixing of the e and f levels. Copyright 1997 Academic Press. Copyright 1997Academic Press

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