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
Wakwella, Praveen
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https://hdl.handle.net/2142/107700
Description
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.
Issue Date
2020-06-22
Keyword(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.
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