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INFRARED SPECTRA OF CARBONYL SULFIDE-ACETYLENE TRIMERS: OCS-(C$_2$H$_2$)$_2$ AND TWO ISOMERS OF (OCS)$_2$-C$_2$H$_2$

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/38399

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Title: INFRARED SPECTRA OF CARBONYL SULFIDE-ACETYLENE TRIMERS: OCS-(C$_2$H$_2$)$_2$ AND TWO ISOMERS OF (OCS)$_2$-C$_2$H$_2$
Creators: Afshari, Mahin; Dehghany, M.; Oliaee, J. N.; Moazzen-Ahmadi, N.; McKellar, A. R. W.
Issue Date: 2009
Abstract: Spectra of acetylene-carbonyl sulphide trimers in the region of the OCS \nub{1} fundamental ($\sim$2062 \wn) are observed using a tunable diode laser to probe a pulsed supersonic slit jet expansion. A previous microwave study of (OCS)$_2$- C$_2$H$_2$ by Peebles and Kuczkowski \textbf{111}, 10511 (1999).} gave a nonplanar triangular twisted structure, which could be thought of as a polar OCS dimer plus a C$_2$H$_2$ monomer lying above the dimer plane. In the present work, three infrared bands are analyzed. The first band clearly belongs to this previously known (OCS)$_2$-C$_2$H$_2$ complex. The second band can be assigned as an isomer of (OCS)$_2$-C$_2$H$_2$ having a similar structure, but with a nonpolar OCS dimer plus a C$_2$H$_2$ monomer above the dimer plane. The third band is assigned to OCS-(C$_2$H$_2$)$_2$. The rotational constants and dipole moment components of all three bands are consistent with barrel shape structures having C$_1$, C$_2$ and C$_s$ symmetries, respectively.
URI: http://hdl.handle.net/1811/38399
Other Identifiers: 2009-RA-02
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