INFRARED SPECTRA OF OCS-C$_{6}$H$_{6}$, OCS-C$_{6}$H$_{6}$-HE AND OCS-C$_{6}$H$_{6}$-NE VAN DER WAALS COMPLEXES
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Date
2010
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Ohio State University
Abstract
The infrared spectrum of weakly-bound OCS-C$_{6}$H$_{6}$ is studied in the region of the $\nu_{1}$ fundamental band of OCS ($\sim$2060 cm$^{-1}$) using a tunable diode laser spectrometer to probe a pulsed supersonic jet expansion. A very simple band is observed, corresponding to a parallel transition of a symmetric top. It is shifted by -11.1 cm$^{-1}$ with respect to the free OCS monomer. The resulting structure has OCS located along the benzene $C_{6}$ symmetry axis in an S-bonded configuration with a center of mass separation of 4.42 \AA, in good agreement with previous microwave spectra. \textbf{99}, 434 (1995).} The isotopomers OCS-$^{13}$C$^{12}$C$_{5}$H$_{6}$ and OC$^{34}$S-C$_{6}$H$_{6}$ are also observed. Similar bands are observed for the OCS-C$_{6}$H$_{6}$-He and OCS-C$_{6}$H$_{6}$-Ne trimers, whose structure is obtained by adding an on-axis rare gas atom to the other side of the benzene. However, the analogous band for OCS-C$_{6}$H$_{6}$-Ar was not detected, raising the possibility that the stable form of this trimer may not have the same symmetrical structure.
Description
Author Institution: Department of Physics and Astronomy, University of Calgary, 2500 University Dr., N.W., Calgary, Alberta T2N 1N4, Canada; Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada