First High-resolution Study Of Vibrationally Excited States Ν17 And Ν12 Of Propylene Oxide

Vávra, Karel

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https://hdl.handle.net/2142/116568 Copy

Description

Title

First High-resolution Study Of Vibrationally Excited States Ν17 And Ν12 Of Propylene Oxide

Author(s)

Vávra, Karel

Contributor(s)

• Giesen, Thomas
• Schlesag, Marcel
• Vereijken, Arne
• Stahl, Pascal
• Fuchs, Guido W.
• Jakob, Jan
• Döring, Eileen

Issue Date

2022-06-21

Keyword(s)

Vibrational structure/frequencies

Abstract

Propylene oxide, \chem{CH_3C_2H_3O}, is a stable chiral molecule that gained new attention through its recent radio astronomical discovery in the interstellar medium toward the galactic center\footnote{B.A. McGuire, P.B. Carroll, R.A. Loomis, I.A. Finneran, P.R. Jewell, A.J. Remijan, G., A. Blake, Science \textbf{352}, 1449–1452 (2016)}. Subsequently, extensive laboratory data on rotational transitions in the ground state and in the lowest vibrationally excited \nub{24} torsion state were published\footnote{A.J. Mesko, L. Zou, P.B. Carroll, S.L. Widicus Weaver, J. Mol. Spectrosc. \textbf{335}, 49–53 (2017)}$^{,}$\footnote{P. Stahl, B. E. Arenas, O. Zingsheim, M. Schnell, L. Margulès, R. A. Motiyenko, G. W. Fuchs, T. F. Giesen, J. Mol. Spectrosc. \textbf{378}, 111445 (2021)}. Previously, only the 3 $\mu$m spectral range of the four C-H stretching vibration modes was measured with high spectral resolution at mid-infrared wavelength\footnote{F.X. Sunahori, Z. Su, C. Kang, Y. Xu. Chem. Phys. Lett. \textbf{494}, 14-20 (2010)}. In the present study we used two quantum cascade laser spectrometers at 8 and 10 $\mu$m to record ro-vibrational spectra of the \nub{17} fundamental mode (\chem{CH_2} rock) at 1023 \wn and the \nub{12} ring breathing mode at 1266 \wn. The spectra were measured in a static cell at room temperature and in a supersonic jet expansion at low temperatures. The room temperature measurement allowed a quick assignment via graphical techniques (Loomis-Wood diagram) and determination of the molecular parameters using the SPFIT/SPCAT program package\footnote{H.M. Pickett, J. Mol. Spectrosc. \textbf{148}, 371–377 (1991)}. In the supersonic jet spectrum line splittings could be observed for certain transitions. The combination of measurements at low temperature (30K) and at room temperature conditions led to an assignment of hundreds of transitions of the very dense infrared spectrum and covers quantum numbers from lowest \emph{J} and \emph{K} up to \emph{J} = 55 and \emph{K}$_{a}$ = 36.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116568

DOI

https://doi.org/10.15278/isms.2022.TG02

Copyright and License Information

Copyright 2022 held by the authors

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