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Title:Infrared Spectra Of (co2)2-x, Co2-x2, And Co2-x3, X = Co Or N2
Author(s):Barclay, A. J.
Contributor(s):Moazzen-Ahmadi, Nasser; Pietropolli Charmet, Andrea; McKellar, A.R.W.
Abstract:We previously observed the spectrum of (CO$_2$)$_2$-CO in the region of the CO fundamental band (2150 \wn).\footnote{A.J. Barclay, A.R.W. McKellar, and N. Moazzen-Ahmadi, \textit{Chemical Physics Letters} \textbf{677}, 127 (2017).} Its structure resembles that of a CO$_2$ dimer (planar slipped-parallel) with a CO monomer aligned along the dimer $C_2$ symmetry axis in a C-bonded configuration, giving a trimer with $C_2$ symmetry. We have now observed three bands of the same species in the CO$_2$ \nub{3} region. Two of these bands are fundamentals, one $a/c$-type and the other $b$-type. The presence of this $b$-type band establishes that the CO$_2$ dimer subunit within the trimer is actually not planar. The third band is a $b$-type combination band near 2376 \wn. A new $c$-type fundamental near 2349.5 \wn and an $a$-type combination band near 2365.2 \wn are assigned to CO$_2$-(CO)$_2$. The structure has two C-bonded CO monomers in equivalent positions around the CO$_2$ 'equator', giving a $C_{2v}$ geometry analogous to that of CO$_2$-Ar$_2$. A similar fundamental is observed for CO$_2$-(N$_2$)$_2$ near 2350.0 \wn. The weak parallel band of a symmetric or near-symmetric rotor near 2349.2 \wn is assigned to CO$_2$-(CO)$_3$, together with an analogous band of CO$_2$-(N$_2$)$_3$ near 2349.8 \wn. We think that these tetramers are accidental symmetric rotors having $C_s$ symmetry. They are obtained by taking the $C_{2v}$ trimers from the previous paragraph and adding a third CO or N$_2$ to the 'side' of the first two, in the plane bisecting them.
Issue Date:2021-06-25
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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