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ASSIGNMENT OF $CH_{3}OH$ FIR LASER LINES FROM NON-CO-STRETCH STATES
Indranath Mukhopadhyay, Mahmoud Mollabashi, Wyn Lewis-Bevan, J. W. C. Johns, R. M. Lees
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Abstract
Assignments of far-infrared (FIR) laser lines of $CH_{3}OH$ originating from excited states other than the normal pure CO-stretch mode will be discussed. First, laser lines optically pumped by the 9R(18), 10P(12) and 13-9R(18) $CO_{2}$ laser lines will be examined. It is proposed that each of these FIR laser systems involves highly excited n=3 torsional levels of the ground vibrational state, in two cases interacting via Fermi resonance with $n=0, C-O$ stretch levels. Secondly, FIR emission from $CH_{3}$ deformation and $CH_{3}$ in-plane rocking modes, pumped by the 9P(40), 10R(44), 13-9P(14) and 13/18-9P(34) $CO_{2}$ lines, will be considered. Probable assignments will be presented, along with supporting spectroscopic evidence from combination frequency loops formed from observed or calculated IR and FIR frequencies.