Second order Coriolis resonance between the C-O stretch and the CH3 rock levels of methanol involving excited torsional state

Spectrochim Acta A Mol Biomol Spectrosc. 1997 Dec;53A(14):2467-9. doi: 10.1016/s1386-1425(97)00152-2.

Abstract

In this paper, it is shown that the interaction responsible for making the series of 'forbidden' transitions from the state (n tau K) = (110) in the ground vibrational (v = 0) state of the levels of (122+) in the CH3-rocking vibrational state (v = r) of methanol is 'Coriolis' resonance and not 'Fermi' resonance as proposed in a recent publication. This has been established from the J-dependence of the observed perturbed energy spacings between the two interacting pairs from high resolution spectroscopic analysis. The J-dependence clearly follows the classic 'Coriolis' interaction matrix elements for delta K = 2, which would not occur if the interaction were due to 'Fermi' resonance.

MeSH terms

  • Infrared Rays
  • Lasers
  • Methanol / chemistry*
  • Physical Phenomena
  • Physics

Substances

  • Methanol