Second order Coriolis resonance between the C-O stretch and the CH3 rock levels of methanol involving excited torsional state.
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.
Mukhopadhyay
I
I
Laser Programme, Centre for Advanced Technology, Indore, India. indra@cat.ernet.in
D007259:Infrared Rays; D007834:Lasers; D000432:Methanol / Q000737:chemistry*; D055585:Physical Phenomena; D010825:Physics
D000432:Methanol