Infrared and millimeter wave spectra of the CH₄–CO complex in the Α internal rotation state

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DOIResolve DOI: http://doi.org/10.1063/1.1349425
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TypeArticle
Journal titleThe Journal Of Chemical Physics
Volume114
Issue11
Pages48244828; # of pages: 5
Subjectcarbon compounds; infrared spectra; millimetre wave spectra; organic compounds; quasimolecules; rotational isomerism; vibrational states
AbstractThe weakly bound van der Waals complex CH₄–CO has been observed spectroscopically for the first time in the infrared (C–O stretching, ≈2143 cm⁻¹) and millimeter wave (80–107 GHz) regions. The spectraanalyzed here resemble quite closely those of the rare gas–carbon monoxide complexes, like Ne–CO and Ar–CO, and they almost certainly arise from CH₄–CO complexes composed of CH₄ in the lowest j=0 rotational state of A symmetry. The effective ground state intermolecular separation is 3.994 Å. Predictions are given here for the K=0 and 1 pure rotational microwave transitions of CH₄–CO in the A state. The infrared spectrum shows numerous additional transitions which must be due to CH₄–CO composed of methane in the F and E symmetry states, but these have not yet been assigned. Future microwave measurements on these F and E states will aid further progress on the infrared spectrum.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number12327877
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Record identifierd92397ca-0c14-46e5-b884-33933c06575a
Record created2009-09-10
Record modified2017-03-23
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