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The infrared spectrum of the weakly-bound molecular complex methanol - carbon monoxide has been observed, for the first time in the gas phase, by means of a parallel (\u394 K = 0) band in the region of the carbon monoxide C\u2013O stretching vibration. The band origin, 2154.5 cm\u20131, represents a blue shift of 11.2 cm\u20131 relative to the free CO molecule; its proximity to that of the H2O \u2013 CO complex points to a similarity of the hydrogen bonding in the two systems. The observed structure of the band could be well reproduced by a simulation based on the methyl internal rotation component of A-symmetry. A component of E-symmetry must also be present, with roughly equal intensity, but the two components were not individually resolved. The observed transitions showed evidence of predissociation broadening, leading to an estimate of t 0.5 ns for the lifetime of the upper (C\u2013O stretching) state.PACS Nos.: 3320E, 3425, 3520P, 3640Peer reviewed: NoNRC publication: Ye

Infrared spectrum of the CH3OH  CO complex in the CO stretching region

Infrared spectrum of the CH₃OH CO complex in the CO stretching region