Infrared bands of CS2 dimer and trimer at 4.5 μm

Barclay, A.J.

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https://hdl.handle.net/2142/104295 Copy

Description

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

Issue Date

2019-06-19

Keyword(s)

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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/104295

DOI

https://doi.org/10.15278/isms.2019.WH04

Copyright and License Information

Copyright 2019 A.J. Barclay

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