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Issue 28, 2007
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Jet-cooled infrared spectrum of methoxy in the CH stretching region

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Abstract

Observations of the jet-cooled infrared spectrum of CH3O in the CH stretching region have been extended, down to 2756 cm−1 and up to 3003 cm−1. In the lower frequency extension, a single vibronic band has been assigned. In the higher frequency region, the spectrum becomes complex above 2900 cm−1 and remains so until near 2970 cm−1 where it rapidly becomes sparse. Including the single vibronic band previously reported, a total of four bands have been assigned. Two bands including the original one follow a perpendicular ΔP = +1 rotational selection rule and the other two bands follow a parallel ΔP = 0 selection rule. In addition to these in the congested region between 2900 and 2970 cm−1, ten isolated sub-bands (two P″ = −1/2, two P″ = +1/2, and six P″ = +1.5) have been assigned, but it has so far not been possible to connect these together to form bands. Taken together these observations suggest that there are strong vibronic couplings between the two CH stretching vibrations and the overtone and combination levels in the region.

Graphical abstract: Jet-cooled infrared spectrum of methoxy in the CH stretching region

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Publication details

The article was received on 12 Jan 2007, accepted on 09 Mar 2007 and first published on 03 Apr 2007


Article type: Paper
DOI: 10.1039/B700502D
Citation: Phys. Chem. Chem. Phys., 2007,9, 3725-3734
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    Jet-cooled infrared spectrum of methoxy in the CH stretching region

    J. Han, S. Hu, H. Chen, Y. Utkin, J. M. Brown and R. F. Curl, Phys. Chem. Chem. Phys., 2007, 9, 3725
    DOI: 10.1039/B700502D

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