dc.creator Rezaei, M. en_US dc.creator Oliaee, J. Norooz en_US dc.creator Moazzen-Ahmadi, N. en_US dc.creator McKellar, A. R. W. en_US dc.date.accessioned 2011-07-12T17:34:46Z dc.date.available 2011-07-12T17:34:46Z dc.date.issued 2011 en_US dc.identifier 2011-TI-11 en_US dc.identifier.uri http://hdl.handle.net/1811/49528 dc.description Author Institution: Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N; 1N4, Canada; Steacie Institute for Molecular Sciences, National Research Council of; Canada, Ottawa, ON K1A 0R6, Canada en_US dc.description.abstract Infrared spectra of carbon disulfide trimer formed in a pulsed supersonic slit-jet expansion are obtained via direct absorption of a tuneable diode laser in the region of the CS$_2$ $\nu_3$ fundamental band ($\sim$ 1535 cm$^{-1}$). Two bands sharing the same lower state were assigned to (C$^{32}$S$_2$)$_3$. These correspond to the two infrared active vibrations (a parallel and a perpendicular band) of the constituent CS$_2$ asymmetric stretches. The weaker perpendicular band is centered at 1524.613 cm$^{-1}$. It is shifted by $-$10.74 cm$^{-1}$ with respect to the free CS$_2$ monomer. The parallel band which is significantly stronger is centered at 1545.669 cm$^{-1}$. It has a vibrational shift of $+$10.31 cm$^{-1}$. The transitions with $K\neq 3n$ and those with $J=$ odd and $K=0$ in the ground state are absent in both bands. This rigorously establishes that this isomer of carbon disulfide trimer has $D_3$ symmetry. Thanks to the symmetry, only two parameters, the C-C distance and the angle between a monomer axis and the plane containing the C atoms, are required to fully define the structure of the trimer. These were determined to be 3.811 {\AA} and 61.8$^irc}$, respectively. In addition, a parallel band corresponding to a single $^{34}$S substitution was observed around 1544.46 cm$^{-1}$. Results from this band are in complete agreement with those of the two bands for (C$^{32}$S$_2$)$_3$. en_US dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title INFRARED SPECTRA OF CS$_2$ TRIMER: OBSERVATION OF AN ISOMER WITH $D_3$ SYMMETRY en_US dc.type Article en_US dc.type Image en_US dc.type Presentation en_US
﻿