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