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Title:SYMMETRY BREAKING OF THE BENDING MODE OF CO2 IN THE PRESENCE OF Ar
Author(s):Gartner, Travis A
Contributor(s):Moazzen-Ahmadi, Nasser ; McKellar, Bob ; Barclay, A. J.
Subject(s):Non-covalent interactions
Abstract:The weak infrared spectrum of CO$_2$-Ar corresponding to the ($v_1$, $v_2^{l_2}$, $v_3$) = (01$^1$1) $\leftarrow$ (01$^1$0) hot band of CO$_2$ is detected in the region of the carbon dioxide $\nu_3$ fundamental vibration ($\sim$2340 cm$^{-1}$), using a tunable OPO to probe a pulsed supersonic slit jet expansion. While this method was previously thought to cool clusters to the lowest rotational states of the ground vibrational state, here we show that under suitable jet expansion conditions, sufficient population remains in the first excited bending mode of CO$_2$ (1-2\%) to enable observation of vibrationally hot CO$_2$-Ar, and thus to investigate the symmetry breaking of the intramolecular bending mode of CO$_2$ in the presence of Ar. The bending mode of CO$_2$ monomer splits into an in-plane and an out-of-plane mode, strongly linked by a Coriolis interaction. Analysis of the spectrum yields a direct measurement of the in-plane / out-of-plane splitting measured to be 0.8770 cm$^{-1}$. This aspect of intramolecular interactions has received little previous experimental and theoretical consideration. Therefore, we provide an additional avenue by which to study the intramolecular dynamics of this simplest dimer in its bending modes. Similar results are obtained for CO$_2$-Ne.
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/2142/107650
Date Available in IDEALS:2020-06-26


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