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Bogomolov A, Roucou A, Bejjani R, Herman M, Moazzen-Ahmadi N, Lauzin C. The rotationally resolved symmetric 2OH excitation in H2O-CO2 observed using pulsed supersonic expansion and CW-CRDS. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138606] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Asselin P, Bruckhuisen J, Roucou A, Goubet M, Martin-Drumel MA, Jabri A, Belkhodja Y, Soulard P, Georges R, Cuisset A. Jet-cooled rovibrational spectroscopy of methoxyphenols using two complementary FTIR and QCL based spectrometers. J Chem Phys 2019; 151:194302. [PMID: 31757131 DOI: 10.1063/1.5128196] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Methoxyphenols (MPs) are a significant component of biomass burning emissions which mainly exists in our atmosphere in the gas phase where they contribute to the formation of secondary organic aerosols (SOAs). Rovibrational spectroscopy is a promising tool to monitor atmospheric MPs and infer their role in SOA formation. In this study, we bring a new perspective on the rovibrational analysis of MP isomers by taking advantage of two complementary devices combining jet-cooled environments and absorption spectroscopy: the Jet-AILES and the SPIRALES setups. Based on Q-branch frequency positions measured in the Jet-AILES Fourier-transform infrared (FTIR) spectra and guided by quantum chemistry calculations, we propose an extended vibrational and conformational analysis of the different MP isomers in their fingerprint region. Some modes such as far-IR out-of-plane -OH bending or mid-IR in-plane -CH bending allow us to assign individually all the stable conformers. Finally, using the SPIRALES setup with three different external cavity quantum cascade laser sources centered on the 930-990 cm-1 and the 1580-1690 cm-1 ranges, it was possible to proceed to the rovibrational analysis of the ν18 ring in-plane bending mode of the MP meta isomer providing a set of reliable excited state parameters, which confirms the correct assignment of two conformers. Interestingly, the observation of broad Q-branches without visible P- and R-branches in the region of the C-C ring stretching bands was interpreted as being probably due to a vibrational perturbation. These results highlight the complementarity of broadband FTIR and narrowband laser spectroscopic techniques to reveal the vibrational conformational signatures of atmospheric compounds over a large infrared spectral range.
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Affiliation(s)
- P Asselin
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - J Bruckhuisen
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - A Roucou
- Laboratoire de Physico-Chimie de l'Atmosphère, EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - M Goubet
- Université de Lille, CNRS, UMR8523 PhLAM Physique des Lasers Atomes et Molécules, F-59000 Lille, France
| | - M-A Martin-Drumel
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - A Jabri
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - Y Belkhodja
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - P Soulard
- Laboratoire MONARIS, UMR-CNRS 8233, Sciences Sorbonne Université, Paris, France and Université Pierre et Marie Curie, 75252 Paris, France
| | - R Georges
- Université de Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
| | - A Cuisset
- Laboratoire de Physico-Chimie de l'Atmosphère, EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
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Jabri A, Fontanari D, Roucou A, Bray C, Hindle F, Dhont G, Mouret G, Bocquet R, Cuisset A. Conformational landscape and inertial defect of methoxyphenol isomers studied by mm-wave spectroscopy and quantum chemistry calculations. J Chem Phys 2019; 150:104303. [PMID: 30876373 DOI: 10.1063/1.5089426] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Because methoxyphenols (MP) are emitted in significant quantities during biomass fires and contribute to the secondary organic aerosols formation which impacts the climate, their gas phase monitoring in the atmosphere is crucial and requires accurate rovibrational cross sections determined with a good knowledge of their ground state (GS) and vibrationally excited state (ES) molecular parameters. Therefore, the rotational spectra of the two isomers, 2-MP (guaïacol) and 4-MP (mequinol), have been measured in absorption and in emission at room temperature using a frequency multiplication chain and a mm-wave Fourier transform chirped-pulse spectrometer, respectively. Guided by quantum chemistry calculations, the conformational landscape has been characterised and the observation of only one rotamer in the spectra of 2-MP and 4-MP has been explained. For 2-MP, the most stable conformation is justified by an intramolecular O-H⋯OCH3 hydrogen-bond which has been characterised by a topology analysis of the electron density. In a global fit including more than 30 000 line assignments, rotational and quartic centrifugal constants of the GS and the three lowest energy ES have been determined allowing to reproduce the millimeter-wave spectra at the experimental accuracy. The same work has been performed on the cis-rotamer of 4-MP highlighting some perturbations marring the fit quality for two vibrationally ES. Finally, the isomeric dependence of the negative inertial defect ΔI agrees with that of the lowest energy out of plane mode ν45, and the variation of ΔI with the degree of vibrational excitation allows a fine estimation of v45 = 1 vibrational wavenumber.
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Affiliation(s)
- A Jabri
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - D Fontanari
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - A Roucou
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - C Bray
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - F Hindle
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - G Dhont
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - G Mouret
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - R Bocquet
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
| | - A Cuisset
- Laboratoire de Physico-Chimie de l'Atmosphère, CNRS EA-4493, Université du Littoral Côte d'Opale, 59140 Dunkerque, France
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Martin-Drumel MA, Roucou A, Brown GG, Thorwirth S, Pirali O, Mouret G, Hindle F, McCarthy MC, Cuisset A. High resolution spectroscopy of six SOCl2 isotopologues from the microwave to the far-infrared. J Chem Phys 2016; 144:084305. [DOI: 10.1063/1.4942024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. A. Martin-Drumel
- Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA and School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, USA
| | - A. Roucou
- Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, Dunkerque, France
| | - G. G. Brown
- Coker College, Hartsville, South Carolina 29550, USA
| | - S. Thorwirth
- I. Physikalisches Institut, Universität zu Köln, Köln, Germany
| | - O. Pirali
- AILES Beamline, Synchrotron SOLEIL, Saint Aubin, France
| | - G. Mouret
- Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, Dunkerque, France
| | - F. Hindle
- Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, Dunkerque, France
| | - M. C. McCarthy
- Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA and School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, USA
| | - A. Cuisset
- Laboratoire de Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale, Dunkerque, France
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