Fundamental and torsional combination bands of two isomers of the OCS-CO2 complex in the CO2 ν3 region

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DOIResolve DOI: http://doi.org/10.1021/jp312339w
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TypeArticle
Journal titleThe Journal of Physical Chemistry A
ISSN1089-5639
Volume117
Issue39
Pages96059611; # of pages: 7
SubjectCombination bands; Fundamental vibrations; Out-of-plane; Stretching region; Torsional frequency; Torsional modes; Tunable diode lasers; Weakly bound complexes; Freons; Isomers; Supersonic aerodynamics; Carbon dioxide
AbstractSpectra of two isomers of the weakly bound complex OCS-CO2 are observed in the region of the CO2 ν3 fundamental vibration (∼2349 cm-1), using an infrared tunable diode laser to probe a pulsed supersonic slit-jet expansion. Two bands are measured and analyzed for each isomer, the fundamental asymmetric stretch of the CO 2 component and a combination band involving this fundamental plus the intermolecular out-of-plane torsional mode. For one isomer, the corresponding torsional combination band is also detected in the OCS ν1 stretching region (∼2060 cm-1). The resulting torsional frequencies are found to be 18.8 and 15.9 cm-1 for isomers a and b of OCS-CO2, respectively. This may be the first time that such a combination band is observed for a higher-energy isomer of a weakly bound complex. © 2013 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270902
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Record identifierfeadff58-d60f-4490-9630-b6f8c9be75b3
Record created2014-02-18
Record modified2017-03-23
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