1
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Berné O, Martin-Drumel MA, Schroetter I, Goicoechea JR, Jacovella U, Gans B, Dartois E, Coudert LH, Bergin E, Alarcon F, Cami J, Roueff E, Black JH, Asvany O, Habart E, Peeters E, Canin A, Trahin B, Joblin C, Schlemmer S, Thorwirth S, Cernicharo J, Gerin M, Tielens A, Zannese M, Abergel A, Bernard-Salas J, Boersma C, Bron E, Chown R, Cuadrado S, Dicken D, Elyajouri M, Fuente A, Gordon KD, Issa L, Kannavou O, Khan B, Lacinbala O, Languignon D, Le Gal R, Maragkoudakis A, Meshaka R, Okada Y, Onaka T, Pasquini S, Pound MW, Robberto M, Röllig M, Schefter B, Schirmer T, Sidhu A, Tabone B, Van De Putte D, Vicente S, Wolfire MG. Formation of the methyl cation by photochemistry in a protoplanetary disk. Nature 2023; 621:56-59. [PMID: 37364766 DOI: 10.1038/s41586-023-06307-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 06/09/2023] [Indexed: 06/28/2023]
Abstract
Forty years ago, it was proposed that gas-phase organic chemistry in the interstellar medium can be initiated by the methyl cation CH3+ (refs. 1-3), but so far it has not been observed outside the Solar System4,5. Alternative routes involving processes on grain surfaces have been invoked6,7. Here we report James Webb Space Telescope observations of CH3+ in a protoplanetary disk in the Orion star-forming region. We find that gas-phase organic chemistry is activated by ultraviolet irradiation.
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Affiliation(s)
- Olivier Berné
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France.
| | | | - Ilane Schroetter
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
| | | | - Ugo Jacovella
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, Orsay, France
| | - Bérenger Gans
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, Orsay, France
| | - Emmanuel Dartois
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, Orsay, France
| | - Laurent H Coudert
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, Orsay, France
| | - Edwin Bergin
- Department of Astronomy, University of Michigan, Ann Arbor, MI, USA
| | - Felipe Alarcon
- Department of Astronomy, University of Michigan, Ann Arbor, MI, USA
| | - Jan Cami
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada
- Institute for Earth and Space Exploration, The University of Western Ontario, London, Ontario, Canada
- Carl Sagan Center, SETI Institute, Mountain View, CA, USA
| | - Evelyne Roueff
- LERMA, Observatoire de Paris, PSL University, Sorbonne Université, CNRS, Meudon, France
| | - John H Black
- Department of Space, Earth, and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden
| | - Oskar Asvany
- I. Physikalisches Institut, Universität zu Köln, Cologne, Germany
| | - Emilie Habart
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | - Els Peeters
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada
- Institute for Earth and Space Exploration, The University of Western Ontario, London, Ontario, Canada
- Carl Sagan Center, SETI Institute, Mountain View, CA, USA
| | - Amelie Canin
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
| | - Boris Trahin
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | - Christine Joblin
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
| | | | - Sven Thorwirth
- I. Physikalisches Institut, Universität zu Köln, Cologne, Germany
| | | | - Maryvonne Gerin
- LERMA, Observatoire de Paris, PSL University, Sorbonne Université, CNRS, Meudon, France
| | - Alexander Tielens
- Leiden Observatory, Leiden University, Leiden, the Netherlands
- Astronomy Department, University of Maryland, College Park, MD, USA
| | - Marion Zannese
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | - Alain Abergel
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | - Jeronimo Bernard-Salas
- ACRI-ST, Centre dEtudes et de Recherche de Grasse (CERGA), Grasse, France
- INCLASS Common Laboratory, Grasse, France
| | | | - Emeric Bron
- LERMA, Observatoire de Paris, PSL University, Sorbonne Université, CNRS, Meudon, France
| | - Ryan Chown
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada
- Institute for Earth and Space Exploration, The University of Western Ontario, London, Ontario, Canada
| | - Sara Cuadrado
- Instituto de Física Fundamental (CSIC), Madrid, Spain
| | - Daniel Dicken
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | - Meriem Elyajouri
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | | | - Karl D Gordon
- Space Telescope Science Institute, Baltimore, MD, USA
| | - Lina Issa
- Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
| | - Olga Kannavou
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | - Baria Khan
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada
| | - Ozan Lacinbala
- KU Leuven Quantum Solid State Physics (QSP), Leuven, Belgium
| | - David Languignon
- LERMA, Observatoire de Paris, PSL University, Sorbonne Université, CNRS, Meudon, France
| | - Romane Le Gal
- Institut de Planétologie et d'Astrophysique de Grenoble, Université Grenoble Alpes, CNRS, Grenoble, France
- Institut de Radioastronomie Millimétrique (IRAM), Saint-Martin d'Hères, France
| | | | - Raphael Meshaka
- LERMA, Observatoire de Paris, PSL University, Sorbonne Université, CNRS, Meudon, France
| | - Yoko Okada
- I. Physikalisches Institut, Universität zu Köln, Cologne, Germany
| | - Takashi Onaka
- Department of Physics, Faculty of Science and Engineering, Meisei University, Tokyo, Japan
- Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Sofia Pasquini
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada
| | - Marc W Pound
- Astronomy Department, University of Maryland, College Park, MD, USA
| | | | - Markus Röllig
- Physikalischer Verein-Gesellschaft für Bildung und Wissenschaft, Frankfurt, Germany
- Physikalisches Institut, Goethe-Universität, Frankfurt, Germany
| | - Bethany Schefter
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada
| | - Thiébaut Schirmer
- Department of Space, Earth, and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | - Ameek Sidhu
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, Canada
- Institute for Earth and Space Exploration, The University of Western Ontario, London, Ontario, Canada
| | - Benoit Tabone
- Institut d'Astrophysique Spatiale, Université Paris-Saclay CNRS, Orsay, France
| | | | - Sílvia Vicente
- Instituto de Astrofísica e Ciências do Espaço, Lisbon, Portugal
| | - Mark G Wolfire
- Astronomy Department, University of Maryland, College Park, MD, USA
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2
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Chrayteh M, Dréan P, Goubet M, Coudert LH, Roucou A, Cuisset A. Microwave spectra of dinitrotoluene isomers: a new step towards the detection of explosive vapors. Phys Chem Chem Phys 2023. [PMID: 37309613 DOI: 10.1039/d3cp01577g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The spectroscopic characterization of explosive taggants used for TNT detection is a research topic of growing interest. We present a gas-phase rotational spectroscopic study of weakly volatile dinitrotoluene (DNT) isomers. The pure rotational spectra of 2,4-DNT and 2,6-DNT were recorded in the microwave range (2-20 GHz) using a Fabry-Perot Fourier-transform microwave (FP-FTMW) spectrometer coupled to a pulsed supersonic jet. Rotational transitions are split by hyperfine quadrupole coupling at the two 14N nuclei leading to up to 9 hyperfine components. The spectral analysis was supported by quantum chemical calculations carried out at the B98/cc-pVTZ and MP2/cc-pVTZ levels of theory. Based on 2D potential energy surfaces at the B98/cc-pVTZ level of theory, the methyl group internal rotation barriers were calculated to be V3 = 515 cm-1 and 698 cm-1 for 2,4- and 2,6-DNT, respectively. Although no splitting due to internal rotation was observed for 2,6-DNT, several splittings were observed for 2,4-DNT. The microwave spectra of both species were fitted using a semi-rigid Hamiltonian accounting for the quadrupole coupling hyperfine structure. Based on the internal axis method (IAM), an additional analysis was performed to retrieve an accurate value of the rotationless A-E tunneling splitting which could be extracted from the rotational dependence of the tunneling splitting. This yielded in the case of 2,4-DNT to an experimental value of 525 cm-1 for the barrier height V3 which agrees well with the DFT value. The coupled internal rotations of -CH3 and -NO2 are investigated in terms of 2-D surfaces, as already done in the case of 2-nitrotoluene [A. Roucou et al., Chem. Phys. Chem., 2020, 21, 2523-2538].
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Affiliation(s)
- Mhamad Chrayteh
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France.
| | - Pascal Dréan
- Univ. Lille, CNRS, UMR8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000 Lille, France
| | - Manuel Goubet
- Univ. Lille, CNRS, UMR8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000 Lille, France
| | - Laurent H Coudert
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France
| | - Anthony Roucou
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France.
| | - Arnaud Cuisset
- Université du Littoral Côte d'Opale, UR 4493, Laboratoire de Physico-Chimie de l'Atmosphère, F-59140 Dunkerque, France.
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3
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Abstract
A new treatment is presented to account for the extreme anomalous centrifugal distortion displayed by the open-shell methylene radical. This new treatment is based on a four-dimensional approach in which both the overall rotation and the large amplitude bending mode are treated simultaneously. It accounts for the spin-rotation and spin-spin fine couplings, assumed to depend on the large amplitude bending coordinate, as well as for the hyperfine coupling. The new treatment is tested analyzing the available high-resolution data. 336 transitions, involving the ground and first excited vibrational states of the bending mode, are reproduced with a unitless standard deviation of 1.3, using 42 molecular constants. Compared to a previous analysis [S. Brünken et al., J. Chem. Phys. 123, 164315 (2005)], the present analysis is more satisfactory as it accounts for a larger dataset and the ratio of the number of data to the number of varied constants is larger. The present theoretical treatment also allows us to retrieve the bending potential and the main kinetic energy term.
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Affiliation(s)
- Laurent H Coudert
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France
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4
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Harper OJ, Coudert LH, Loison JC, Gans B, Douin S, Garcia GA, Guillemin JC, Boyé-Péronne S. Quasi-symmetry effects in the threshold photoelectron spectrum of methyl isocyanate. J Chem Phys 2020; 153:074308. [DOI: 10.1063/5.0017753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Oliver J. Harper
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France
| | - Laurent H. Coudert
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS-Université de Bordeaux, Bât. A12, 351 Cours de la Libération, F-33405 Talence Cedex, France
| | - Bérenger Gans
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France
| | - Stéphane Douin
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, Gif sur Yvette, France
| | - Jean-Claude Guillemin
- Univ. Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR-UMR6226, F-35000 Rennes, France
| | - Séverine Boyé-Péronne
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France
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5
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Garcia GA, Krüger J, Gans B, Falvo C, Coudert LH, Loison JC. Erratum: “Valence shell threshold photoelectron spectroscopy of the CHxCN (x = 0–2) and CNC radicals” [J. Chem. Phys. 147, 013908 (2017)]. J Chem Phys 2020; 152:169903. [DOI: 10.1063/5.0010035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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)
- Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Julia Krüger
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Cyril Falvo
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Laurent H. Coudert
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS—Université de Bordeaux, Bât. A12, 351 Cours de la Libération, F-33405 Talence Cedex, France
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6
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Abstract
We have used continuous-wave cavity ring-down spectroscopy to record the spectrum of H2O-Ar in the 2OH excitation range of H2O. 24 sub-bands have been observed. Their rotational structure (Trot = 12 K) is analyzed and the lines are fitted separately for ortho and para species together with microwave and far infrared data from the literature, with a unitless standard deviation σ=0.98 and 1.31, respectively. Their vibrational analysis is supported by a theoretical input based on an intramolecular potential energy surface obtained through ab initio calculations and computation of the rotational energy of sub-states of the complex with the water monomer in excited vibrational states up to the first hexad. For the ground and (010) vibrational states, the theoretical results agree well with experimental energies and rotational constants in the literature. For the excited vibrational states of the first hexad, they guided the assignment of the observed sub-bands. The upper state vibrational predissociation lifetime is estimated to be 3 ns from observed spectral linewidths.
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Affiliation(s)
- Thomas Vanfleteren
- Service de Chimie Quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles, 50, Ave., Roosevelt B-1050, Belgium
| | - Tomas Földes
- Service de Chimie Quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles, 50, Ave., Roosevelt B-1050, Belgium
| | - Michel Herman
- Service de Chimie Quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles, 50, Ave., Roosevelt B-1050, Belgium
| | - Jacques Liévin
- Service de Chimie Quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles, 50, Ave., Roosevelt B-1050, Belgium
| | - Jérôme Loreau
- Service de Chimie Quantique et Photophysique, CP160/09, Faculté des Sciences, Université Libre de Bruxelles, 50, Ave., Roosevelt B-1050, Belgium
| | - Laurent H Coudert
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
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7
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Affiliation(s)
- Laurent H. Coudert
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS–Université de Bordeaux, Bât. A12, 351 Cours de la Libération, F-33405 Talence Cedex, France
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8
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Rivera-Rivera LA, McElmurry BA, Scott KW, Springer SD, Lucchese RR, Bevan JW, Leonov II, Coudert LH. 6.2 μm spectrum and 6-dimensional morphed potentials of OC-H2O. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2017.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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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9
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Garcia GA, Krüger J, Gans B, Falvo C, Coudert LH, Loison JC. Valence shell threshold photoelectron spectroscopy of the CHxCN (x = 0-2) and CNC radicals. J Chem Phys 2017; 147:013908. [DOI: 10.1063/1.4978336] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [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)
- Gustavo A. Garcia
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Julia Krüger
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint Aubin BP 48, F-91192 Gif sur Yvette Cedex, France
| | - Bérenger Gans
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Cyril Falvo
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Laurent H. Coudert
- Institut des Sciences Moléculaires d’Orsay (ISMO), CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - Jean-Christophe Loison
- Institut des Sciences Moléculaires, UMR 5255 CNRS—Université de Bordeaux, Bât. A12, 351 Cours de la Libération, F-33405 Talence Cedex, France
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10
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Demaison J, Craig NC, Gurusinghe R, Tubergen MJ, Rudolph HD, Coudert LH, Szalay PG, Császár AG. Fourier Transform Microwave Spectrum of Propene-3-d 1 (CH 2═CHCH 2D), Quadrupole Coupling Constants of Deuterium, and a Semiexperimental Equilibrium Structure of Propene. J Phys Chem A 2017; 121:3155-3166. [PMID: 28368600 DOI: 10.1021/acs.jpca.7b01470] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The ground-state rotational spectrum of propene-3-d1, CH2═CHCH2D, was measured by Fourier transform microwave spectroscopy. Transitions were assigned for the two conformers, one with the D atom in the symmetry plane (S) and the other with the D atom out of the plane (A). The energy difference between the two conformers was calculated to be 6.5 cm-1, the S conformer having lower energy. The quadrupole hyperfine structure due to deuterium was resolved and analyzed for both conformers. The experimental quadrupole coupling and the centrifugal distortion constants compared favorably to their ab initio counterparts. Ground-state rotational constants for the S conformer are 40582.157(9), 9067.024(1), and 7766.0165(12) MHz. Ground-state rotational constants for the A conformer are 43403.75(3), 8658.961(2), and 7718.247(2) MHz. For the A conformer, a small tunneling splitting (19 MHz) due to internal rotation was observed and analyzed. Using the new rotational constants of this work as well as those previously determined for the 13C species and for some deuterium-substituted species from the literature, a new semiexperimental equilibrium structure was determined and its high accuracy was confirmed. The difficulty in obtaining accurate coordinates for the out-of-plane hydrogen atom is discussed.
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Affiliation(s)
- Jean Demaison
- Section of Chemical Information Systems, University of Ulm , Albert Einstein Allee 47, 89069 Ulm, Germany
| | - Norman C Craig
- Department of Chemistry and Biochemistry, Oberlin College , Oberlin, Ohio 44074, United States
| | - Ranil Gurusinghe
- Department of Chemistry, Kent State University , Kent, Ohio 44242, United States
| | - Michael J Tubergen
- Department of Chemistry, Kent State University , Kent, Ohio 44242, United States
| | - Heinz Dieter Rudolph
- Section of Chemical Information Systems, University of Ulm , Albert Einstein Allee 47, 89069 Ulm, Germany
| | - Laurent H Coudert
- Institut des Sciences Moléculaires d'Orsay, UMR 8214, Bâtiment 210, Université Paris-Sud , 91405 Orsay, France
| | - Péter G Szalay
- Institute of Chemistry, Eötvös Loránd University , Budapest H-1053, Hungary
| | - Attila G Császár
- MTA-ELTE Complex Chemical Systems Research Group , Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
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11
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Coudert LH, Zemouli M, Motiyenko RA, Margulès L, Klee S. Analysis of the microwave, terahertz, and far infrared spectra of monodeuterated methanol CH2DOH up to J = 26, K = 11, and o(1). J Chem Phys 2014; 140:064307. [PMID: 24527915 DOI: 10.1063/1.4864203] [Citation(s) in RCA: 8] [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
The first theoretical approach aimed at accounting for the energy levels of a non-rigid molecule displaying asymmetric-top asymmetric-frame internal rotation is developed. It is applied to a line position analysis of the high-resolution spectrum of the non-rigid CH2DOH molecule and allows us to carry out a global analysis of a data set consisting of already available data and of microwave and far infrared transitions measured in this work. The analysis is restricted to the three lowest lying torsional levels (e0, e1, and o1), to K ⩽ 11, and to J ⩽ 26. For the 8211 fitted lines, the unitless standard deviation is 2.4 and 103 parameters are determined including kinetic energy, hindering potential, and distortion effects parameters.
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Affiliation(s)
- L H Coudert
- Laboratoire Inter-universitaire des Systèmes Atmosphériques, UMR 7583 du CNRS, Universités Paris Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - M Zemouli
- Laboratoire d'Études Physico-Chimiques, Université Dr. T. Moulay de Saïda, Saïda 20000, Algeria
| | - R A Motiyenko
- Laboratoire de Physique des Lasers, Atomes et Molécules, UMR 8523 CNRS - Université Lille I, Bât. P5, 59655 Villeneuve d'Ascq Cedex, France
| | - L Margulès
- Laboratoire de Physique des Lasers, Atomes et Molécules, UMR 8523 CNRS - Université Lille I, Bât. P5, 59655 Villeneuve d'Ascq Cedex, France
| | - S Klee
- Physikalisch-Chemisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
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12
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Lauzin C, Coudert LH, Herman M, Liévin J. Ab Initio Intermolecular Potential of Ar–C2H2 Refined Using High-Resolution Spectroscopic Data. J Phys Chem A 2013; 117:13767-74. [DOI: 10.1021/jp408013n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Clément Lauzin
- Service
de Chimie quantique et Photophysique CP160/09, Faculté des
Sciences, Université Libre de Bruxelles (ULB), Av. Roosevelt,
50, B-1050 Bruxelles, Belgium
- Laboratorium
für Physikalisch Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - Laurent H. Coudert
- Laboratoire
Inter-universitaire des Systèmes Atmosphériques (LISA), UMR 7583 CNRS, Universités Paris Est Créteil et Paris Diderot, 61
Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Michel Herman
- Service
de Chimie quantique et Photophysique CP160/09, Faculté des
Sciences, Université Libre de Bruxelles (ULB), Av. Roosevelt,
50, B-1050 Bruxelles, Belgium
| | - Jacques Liévin
- Service
de Chimie quantique et Photophysique CP160/09, Faculté des
Sciences, Université Libre de Bruxelles (ULB), Av. Roosevelt,
50, B-1050 Bruxelles, Belgium
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13
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Abstract
An analysis of the torsional spectrum of monodeuterated methanol CH(2)DOH is presented. Twenty nine torsional subbands have been assigned in the 20-800 cm(-1) region. The newly assigned subbands and those already available in the literature were analyzed with a theoretical approach accounting for internal rotation of an asymmetrical CH(2)D methyl group. Seventy six subband centers were reproduced with an rms value of 0.09 cm(-1). Spectroscopic parameters corresponding to the generalized inertia tensor and to the hindering potential were determined as well as rotation-torsion distortion constants.
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Affiliation(s)
- A El Hilali
- Laboratoire Inter-universitaire des Systèmes Atmosphériques, UMR 7583 du CNRS, Universités Paris Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
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14
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Abstract
Control of the torsional angles of nonrigid molecules is key for the development of emerging areas like molecular electronics and nanotechnology. Based on a rigorous calculation of the rotation-torsion-Stark energy levels of nonrigid biphenyl-like molecules, we show that, unlike previously believed, instantaneous rotation-torsion-Stark eigenstates of such molecules, interacting with a strong laser field, present a large degree of delocalization in the torsional coordinate even for the lowest energy states. This is due to a strong coupling between overall rotation and torsion leading to a breakdown of the torsional alignment. Thus, adiabatic control of changes on the planarity of this kind of molecule is essentially impossible unless the temperature is on the order of a few Kelvin.
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Affiliation(s)
- L H Coudert
- Laboratoire Inter-universitaire des Systèmes Atmosphériques, UMR 7583 du CNRS, Université Paris Est Créteil, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France.
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15
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Coudert LH, Garcia-Fernandez P, Mäder H, Demaison J, Boggs JE. Ab Initio and Experimental Studies of the Large-Amplitude Motion in BF2OH. J Phys Chem A 2008; 112:1536-44. [DOI: 10.1021/jp709852p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laurent H. Coudert
- LISA, CNRS UMR 7583, Universités Paris 12 et Paris 7, CNRS, 61 Avenue du Général de Gaulle, F-94010 Créteil, France; Department of Chemistry, University of Texas, Austin, Texas 78712; Institut für Physikalische Chemie, Universtät Kiel, Olshausenstr. 40, D-24098 Kiel, Germany; and Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Bat. P5, Université de Lille I, 59655 Villeneuve d'Ascq Cedex, France
| | - Pablo Garcia-Fernandez
- LISA, CNRS UMR 7583, Universités Paris 12 et Paris 7, CNRS, 61 Avenue du Général de Gaulle, F-94010 Créteil, France; Department of Chemistry, University of Texas, Austin, Texas 78712; Institut für Physikalische Chemie, Universtät Kiel, Olshausenstr. 40, D-24098 Kiel, Germany; and Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Bat. P5, Université de Lille I, 59655 Villeneuve d'Ascq Cedex, France
| | - Heinrich Mäder
- LISA, CNRS UMR 7583, Universités Paris 12 et Paris 7, CNRS, 61 Avenue du Général de Gaulle, F-94010 Créteil, France; Department of Chemistry, University of Texas, Austin, Texas 78712; Institut für Physikalische Chemie, Universtät Kiel, Olshausenstr. 40, D-24098 Kiel, Germany; and Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Bat. P5, Université de Lille I, 59655 Villeneuve d'Ascq Cedex, France
| | - Jean Demaison
- LISA, CNRS UMR 7583, Universités Paris 12 et Paris 7, CNRS, 61 Avenue du Général de Gaulle, F-94010 Créteil, France; Department of Chemistry, University of Texas, Austin, Texas 78712; Institut für Physikalische Chemie, Universtät Kiel, Olshausenstr. 40, D-24098 Kiel, Germany; and Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Bat. P5, Université de Lille I, 59655 Villeneuve d'Ascq Cedex, France
| | - James E. Boggs
- LISA, CNRS UMR 7583, Universités Paris 12 et Paris 7, CNRS, 61 Avenue du Général de Gaulle, F-94010 Créteil, France; Department of Chemistry, University of Texas, Austin, Texas 78712; Institut für Physikalische Chemie, Universtät Kiel, Olshausenstr. 40, D-24098 Kiel, Germany; and Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Bat. P5, Université de Lille I, 59655 Villeneuve d'Ascq Cedex, France
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16
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Abstract
A potential energy surface is retrieved for the Ar-CO complex by carrying out a global analysis of its high-resolution spectroscopic data. The data set consists of already published microwave and infrared data and of new microwave transitions which are presented in the paper. The theoretical approach used to reproduce the spectrum is based on a model Hamiltonian which accounts simultaneously for the two large amplitude van der Waals modes and for the overall rotation of the complex. Only the vCO = 0 state is considered. The root-mean-square deviation of the analysis is 18 MHz for the microwave data and 1.4 x 10(-3) cm(-1) for the infrared energy difference data. Fifteen parameters corresponding to the potential energy function are determined in addition to two kinetic energy parameters and two distortion-type parameters. The potential energy surface derived is in good agreement with the one obtained by Shin, Shin, and Tao [J. Chem. Phys. 104, 183 (1996)].
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Affiliation(s)
- L H Coudert
- Laboratorie de Photophysique Moléculaire, CNRS, Bâtiment 350, Université de Paris-Sud, 91405 Orsay, Cedex, France.
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17
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Lahmani F, Zehnacker-Rentien A, Coudert LH, Zachariasse KA. Spectroscopic Studies of the S0−S1 Transition of Substituted 1-Aminonaphthalenes in a Supersonic Jet. J Phys Chem A 2003. [DOI: 10.1021/jp030340h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Françoise Lahmani
- Laboratoire de Photophysique Moléculaire du CNRS, Bat. 210, Université de Paris-Sud, F-91405 Orsay Cedex, France, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Anne Zehnacker-Rentien
- Laboratoire de Photophysique Moléculaire du CNRS, Bat. 210, Université de Paris-Sud, F-91405 Orsay Cedex, France, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Laurent H. Coudert
- Laboratoire de Photophysique Moléculaire du CNRS, Bat. 210, Université de Paris-Sud, F-91405 Orsay Cedex, France, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
| | - Klaas A. Zachariasse
- Laboratoire de Photophysique Moléculaire du CNRS, Bat. 210, Université de Paris-Sud, F-91405 Orsay Cedex, France, and Max-Planck-Institut für biophysikalische Chemie, Spektroskopie und Photochemische Kinetik, 37070 Göttingen, Germany
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18
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Lanquetin R, Coudert LH, Camy-Peyret C. High-Lying Rotational Levels of Water: Comparison of Calculated and Experimental Energy Levels for (000) and (010) up to J = 25 and 21. J Mol Spectrosc 1999; 195:54-67. [PMID: 10191152 DOI: 10.1006/jmsp.1999.7822] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Emission spectra of methane-oxygen low-pressure flames have been recorded at a resolution of 0.02 cm-1 with an infrared Fourier transform spectrometer in the spectral ranges 780-1370 and 1800-5000 cm-1. The flame temperature was about 1850 K and a large number of transitions involving J values as high as 34 for an extended set of vibrational states could be assigned. Combined with already published data sets on H2O, our line position analysis yielded rotational energy levels for many of these states, but only the results relevant to the ground and the (010) states are presented here. The experimental energies for these two states have been fitted with the help of the bending-rotation Hamiltonian approach [L. H. Coudert, J. Mol. Spectrosc. 181, 246-273 (1997)], and for each rotational level, the calculated energy along with its uncertainty is reported and compared with the observed value. Comparisons with other available energy level data sets for the ground and (010) states are also presented. Copyright 1999 Academic Press.
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Affiliation(s)
- R Lanquetin
- Unité propre du CNRS (UPR 0136), Université Pierre et Marie Curie, Tour 13, Boîte 76, 4 Place Jussieu, Paris Cedex 05, 75252, France
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19
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Bailleux S, Bogey M, Bolvin H, Civis S, Cordonnier M, Krupnov AF, Tretyakov MY, Walters A, Coudert LH. Sub-Millimeter-Wave Spectroscopy of the Ar.H+3 and Ar.D+3 Ionic Complexes. J Mol Spectrosc 1998; 190:130-139. [PMID: 9645933 DOI: 10.1006/jmsp.1998.7564] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
An investigation of the sub-millimeter-wave spectra of the ionic complexes Ar.H+3 and Ar.D+3 is presented. These complexes were produced in a negative glow electric discharge, in mixtures of argon with either H2 or D2. About 80 new transitions were assigned in the 485-680 GHz frequency range using a sub-millimeter-wave spectrometer built with Russian made backward wave oscillators (BWO) sources. These measurements enabled us to observe the first Ka = 2 transitions for Ar.H+3 and the first Ka = 3 transitions for Ar.D+3. Analyses of the line frequencies were carried out using an IAM-like approach, which accounts for the large amplitude internal rotation motion displayed by both species. Insights into the geometry of the intermediate configuration for this large amplitude motion were gained. Copyright 1998 Academic Press.
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Affiliation(s)
- S Bailleux
- Centre d'Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq Cedex, F-59655, France
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