High resolution rovibrational analysis of dimethyl sulfide spectrum in the 10 µm atmospheric window combining supersonic jet-quantum cascade laser and FTIR spectroscopies
| Autor: | Atef Jabri, Isabelle Kleiner, Yann Berger, Pierre Asselin, Yacine Belkhodja |
|---|---|
| Přispěvatelé: | De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies (MONARIS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physico-Chimie de l'Atmosphère (LPCA), Université du Littoral Côte d'Opale (ULCO), Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université du Littoral Côte d'Opale, Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Infrared Rovibrational spectroscopy Quantum cascade laser 01 natural sciences Molecular physics law.invention law 0103 physical sciences Rigid rotor Physical and Theoretical Chemistry Fourier transform infrared spectroscopy 010303 astronomy & astrophysics Spectroscopy 0105 earth and related environmental sciences [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Spectrometer Supersonic pulsed jet Rotational–vibrational spectroscopy Atomic and Molecular Physics and Optics [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry Fourier transform IR spectroscopy Infrared window Excited state |
| Zdroj: | Journal of Molecular Spectroscopy Journal of Molecular Spectroscopy, Elsevier, 2018, 349, pp.32-36. ⟨10.1016/j.jms.2018.03.012⟩ |
| ISSN: | 0022-2852 1096-083X |
| DOI: | 10.1016/j.jms.2018.03.012⟩ |
| Popis: | International audience; The rovibrational spectrum of the v14 CH3-bending mode of dimethyl sulfide CH3SCH3 was recorded in the 945–1005 cm−1 spectral region combining data from a tunable infrared quantum cascade laser spectrometer coupled to a pulsed slit jet and from a high resolution Fourier transform spectrometer coupled to a room temperature gas absorption cell. The characteristic PQR band contour of a vibrational mode with a b1 symmetry species in the C2v group was observed with both infrared methods but the rovibrational cooling achieved in the pulsed supersonic expansion (20 K in rotation) proved to be essential for starting the rovibrational analysis of such asymmetric top molecule. Internal rotation splittings were recently observed and analyzed in the ground and first torsional excited states. However, they are expected to be very small and could not be resolved in the v14 state using our infrared spectroscopic probes. Therefore a classic reduced effective Hamiltonian of an asymmetric rigid rotor was used. Finally, 1119 transitions from both jet-cooled and room temperature experiments were assigned and included in a global fit with J ≤ 29. A total of 9 rovibrational parameters including pure rotational constants as well as quartic centrifugal distortion constants were determined with high accuracy. These parameters can be used to produce a reliable line-list for an atmospheric detection of DMS. |
| Databáze: | OpenAIRE |
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