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 Title: THE 4.2 MICRON SPECTRA OF CO2-CO DIMER FOR BOTH THE C- AND O-BONDED ISOMERS, INCLUDING SPLITTING OF THE DEGENERATE ν2 BEND IN THE PRESENCE OF CO Author(s): Wakwella, Praveen Contributor(s): Moazzen-Ahmadi, Nasser ; McKellar, Bob ; Barclay, A. J. Subject(s): Non-covalent interactions Abstract: Infrared spectra of the CO$_2$-CO dimer are observed in the carbon dioxide $\nu_3$ asymmetric stretch region ($\sim$2350 cm$^{-1}$) using a tunable infrared optical parametric oscillator to probe a pulsed slit jet supersonic expansion. Both C-bonded and O-bonded isomers are analyzed for the normal isotopologue as well as for $^{13}$CO$_2$-CO and $^{16}$O$^{13}$C$^{18}$O-CO, the latter being the first observation of an asymmetrically substituted form for which all values of K$_a$ are allowed. A combination band involving the lowest in-plane intermolecular mode ($\sim$24.5 cm$^{-1}$) is also studied for the C-bonded form. A weak band near 2337 cm$^{-1}$ is assigned to the CO$_2$ hot band transition ($v_1$, $v_2^{l_2}$, $v_3$) = (01$^1$1) $\leftarrow$ (01$^1$0), yielding the splitting of the degenerate CO$_2$ $\nu_2$ bend into in-plane and out-of-plane components due to the presence of the CO. The splitting, an aspect of intermolecular forces which has received little attention in the past, has rather different values of 4.56 and 1.59 cm$^{-1}$ for the C- and O- bonded isomers, respectively. Issue Date: 22-Jun-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/107700 Date Available in IDEALS: 2020-06-26
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