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Title:INFRARED BANDS OF CS2 DIMER AND TRIMER AT 4.5 μm
Author(s):Barclay, A. J.
Contributor(s):Moazzen-Ahmadi, Nasser ; McKellar, Bob ; Michaelian, K. H.; Esteki, Koorosh
Subject(s):Mini-symposium: Non-covalent Interactions
Abstract:We report observation of new infrared bands of \chem{(CS_2)_2} and \chem{(CS_2)_3} in the region of the \chem{CS_2} \nub{1} + \nub{3} combination band (at 4.5 $\mu$m) using a quantum cascade laser. The complexes are formed in a pulsed supersonic slit-jet expansion of a gas mixture of carbon disulfide in helium. We have previously shown that the most stable isomer of \chem{(CS_2)_2} is a cross-shaped structure with \chem{D_{2d}} symmetry and that for \chem{(CS_2)_3} is a barrel-shaped structure with \chem{D_3} symmetry. The dimer has one doubly degenerate infrared-active band in the \nub{1} + \nub{3} region of the \chem{CS_2} monomer. This band is observed to have a rather small vibrational shift of -0.846 \wn. We expect one parallel and one perpendicular infrared-active band for the trimer but observe two parallel and one perpendicular bands. Much larger vibrational shifts of -8.953 \wn for the perpendicular band and -8.845 \wn and +16.681 \wn for the parallel bands are observed. Vibrational shifts and possible vibrational assignments, in the case of the parallel bands of the trimer, are discussed using group theoretical arguments.
Issue Date:2019-06-19
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/104295
DOI:10.15278/isms.2019.WH04
Rights Information:Copyright 2019 A. J. Barclay
Date Available in IDEALS:2019-07-15
2020-01-25


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