Abstract

Optically pumped fir laser lines in CH 3OH are studied by combined fir emission Stark effect and transferred Lamb dip spectroscopy. Effective dipole moments are determined, which are interpreted as being associated with hybridization of CO stretch states and states of a different vibrational mode, with same J but different K. Far-infrared laser lines originating from large offset absorption lines, which are Stark-tuned into coincidence, are assigned. The results suggest that the mode interacting with the CO stretch is the CH 3 symmetric rocking mode.

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