Fundamental and torsional combination bands of two isomers of the OCS-CO2 complex in the CO2 ν3 region.
J Phys Chem A
; 117(39): 9605-11, 2013 Oct 03.
Article
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| MEDLINE
| ID: mdl-23323975
ABSTRACT
Spectra of two isomers of the weakly bound complex OCS-CO2 are observed in the region of the CO2 ν3 fundamental vibration (â¼2349 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 CO2 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 (â¼2060 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.
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2013
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Article