JET-COOLED INFRARED LASER SPECTROSCOPY OF DIMETHYL SULFIDE: HIGH RESOLUTION ANALYSIS OF THE ν14 CH3-BENDING MODE

Jabri, Atef

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https://hdl.handle.net/2142/96866 Copy

Description

Title

JET-COOLED INFRARED LASER SPECTROSCOPY OF DIMETHYL SULFIDE: HIGH RESOLUTION ANALYSIS OF THE ν14 CH3-BENDING MODE

Author(s)

Jabri, Atef

Contributor(s)

• Asselin, Pierre
• Kleiner, Isabelle

Issue Date

6/19/2017

Keyword(s)

Comparing theory and experiment

Abstract

The rovibrational spectrum of the nub{14} chem{CH_3}-bending mode of dimethyl sulfide chem{(CH_3)_2S} was recorded in the 963-987 wn spectral region using our sensitive tunable quantum cascade laser spectrometer coupled to a pulsed slit jetfootnote{P. Asselin, Y. Berger, T. R. Huet, R. Motiyenko, L. Margulès, R. J. Hendricks, M. R. Tarbutt, S. Tokunaga, B. Darquié, Phys. Chem. Chem. Phys. 19, 4576 (2017)} footnote{P. Asselin, A. Potapov, A. Turner, V. Boudon, L. Bruel, M. A. Gaveau and M. Mons, submitted to J. Phys. Chem. Lett. (2017)}. The combined use of a high dilution chem{(CH_3)_2S}/Ar gas mixture expanded at high backing pressure through a slit nozzle enabled to obtain an efficient rovibrational cooling which narrows the rotational distribution and eliminates hot bands arising from three low frequency modes below 300 wn footnote{M. L. Senent, C. Puzzarini, R. Domínguez-Gómez, M. Carvajal, and M. Hochlaf, J. Chem. Phys., 140, 124302 (2014)}. The characteristic PQR band contour of a b$_{1}$ symmetry mode centered at 975.29 wn was observed and will be compared with theoretical calculations at the CCSD(T)/VTZ level$^{c}$ (nub{14} mode at 986 wn) and room temperature experiments at low resolution (974 wn)footnote{J. W. Ypenburg & H. Gerding, Recueil des Travaux Chimiques des Pays-Bas, 90, 885 (1971)}. Starting from the accurate set of ground state parameters derived from microwave, millimeter and far-infrared measurements, the rovibrational analysis will be presented and discussed.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/96866

DOI

10.15278/isms.2017.MI09

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