The sub-bands of the torsional vibration of acrolein have been resolved. The marked degradation indicates a change of about 2.7% in the rotational constant A in the first torsionally excited state. This results in the R branch being much more intense than the P branch. Some further contribution to the R branch intensity is considered to be due to the difference band ν13–ν18(Brand's notation9) enhanced by Fermi resonance ν13 with 2ν18.
G. E. Campagnaro and J. L. Wood, Trans. Faraday Soc., 1966, 62, 263 DOI: 10.1039/TF9666200263
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