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Gans B, Liévin J, Halvick P, Chen NL, Boyé-Péronne S, Hartweg S, Garcia GA, Loison JC. Single-photon ionization of SiC in the gas phase: experimental and ab initio characterization of SiC . Phys Chem Chem Phys 2023; 25:23568-23578. [PMID: 37656136 DOI: 10.1039/d3cp02775a] [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: 09/02/2023]
Abstract
We report the first experimental observation of single-photon ionization transitions of the SiC radical between 8.0 and 11.0 eV performed on the DESIRS beamline at the SOLEIL synchrotron facility. The SiC radical, very difficult to synthesize in the gas phase, was produced through chemical reactions between CHx (x = 0-3) and SiHy (y = 0-3) in a continuous microwave discharge flow tube, the CHx and SiHy species being formed by successive hydrogen-atom abstractions induced by fluorine atoms on methane and silane, respectively. Mass-selected ion yield and photoelectron spectra were recorded as a function of photon energy using a double imaging photoelectron/photoion coincidence spectrometer. The photoelectron spectrum enables the first direct experimental determinations of the X+ 4Σ- ← X 3Π and 1+ 2Π ← X 3Π adiabatic ionization energies of SiC (8.978(10) eV and 10.216(24) eV, respectively). Calculated spectra based on Franck-Condon factors are compared with the experimental spectra. These spectra were obtained by solving the rovibrational Hamiltonian, using the potential energy curves calculated at the multireference single and double configuration interaction level with Davidson correction (MRCI + Q) and the aug-cc-pV5Z basis set. MRCI + Q calculations including the core and core-valence electron correlation were performed using the aug-cc-pCV6Z basis set to predict the spectroscopic properties of the six lowest electronic states of SiC+. Complete basis set extrapolations and relativistic energy corrections were also included in the determination of the energy differences characterizing the photoionization process. Using our experimental and theoretical results, we derived semi-experimental values for the five lowest ionization energies of SiC.
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Affiliation(s)
- B Gans
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Saclay, F-91405 Orsay, France.
| | - J Liévin
- Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing, Université Libre de Bruxelles, CP 160/09, B-1050 Bruxelles, Belgium
| | - P Halvick
- Institut des Sciences Moléculaires, CNRS, Université de Bordeaux, F-33400 Talence, France
| | - N L Chen
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Saclay, F-91405 Orsay, France.
| | - S Boyé-Péronne
- Institut des Sciences Moléculaires d'Orsay, CNRS, Université Paris-Saclay, F-91405 Orsay, France.
| | - S Hartweg
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, F-91192 Gif sur Yvette, France
| | - G A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, St. Aubin, F-91192 Gif sur Yvette, France
| | - J-C Loison
- Institut des Sciences Moléculaires, CNRS, Université de Bordeaux, F-33400 Talence, France
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Dahlmann F, Jusko P, Lara-Moreno M, Halvick P, Marimuthu AN, Michaelsen T, Wild R, Geistlinger K, Schlemmer S, Stoecklin T, Wester R, Brünken S. Predissociation spectroscopy of cold CN −H 2 and CN −D 2. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2085204] [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: 10/18/2022]
Affiliation(s)
- Franziska Dahlmann
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
| | - Pavol Jusko
- Max Planck Institute for Extraterrestrial Physics, Garching, Germany
| | | | | | - Aravindh N. Marimuthu
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Nijmegen, the Netherlands
| | - Tim Michaelsen
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
| | - Robert Wild
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
| | - Katharina Geistlinger
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
| | | | | | - Roland Wester
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria
| | - Sandra Brünken
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Nijmegen, the Netherlands
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Dahlmann F, Lochmann C, Marimuthu AN, Lara-Moreno M, Stoecklin T, Halvick P, Raoult M, Dulieu O, Wild R, Schlemmer S, Brünken S, Wester R. Strong ortho/para effects in the vibrational spectrum of Cl -(H 2). J Chem Phys 2021; 155:241101. [PMID: 34972371 DOI: 10.1063/5.0073749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The predissociation spectrum of the Cl-35(H2) complex is measured between 450 and 800 cm-1 in a multipole radiofrequency ion trap at different temperatures using the FELIX infrared free electron laser. Above a certain temperature, the removal of the Cl-(p-H2) para nuclear spin isomer by ligand exchange to the Cl-(o-H2) ortho isomer is suppressed effectively, thereby making it possible to detect the spectrum of this more weakly bound complex. At trap temperatures of 30.5 and 41.5 K, we detect two vibrational bands of Cl-(p-H2) at 510(1) and 606(1) cm-1. Using accurate quantum calculations, these bands are assigned to transitions to the inter-monomer vibrational modes (v1,v2 l2 ) = (0, 20) and (1, 20), respectively.
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Affiliation(s)
- Franziska Dahlmann
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Christine Lochmann
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Aravindh N Marimuthu
- FELIX Laboratory, Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | | | | | - Philippe Halvick
- Université de Bordeaux, ISM, CNSR UMR 5255, 33405 Talence, France
| | - Maurice Raoult
- Université Paris-Saclay, CNRS, Laboratoire Aimé Cotton, 91405 Orsay, France
| | - Olivier Dulieu
- Université Paris-Saclay, CNRS, Laboratoire Aimé Cotton, 91405 Orsay, France
| | - Robert Wild
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
| | - Stephan Schlemmer
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
| | - Sandra Brünken
- FELIX Laboratory, Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Roland Wester
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
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Lara-Moreno M, Stoecklin T, Halvick P, Hochlaf M. Correction: Quantum tunneling dynamical behaviour on weakly bound complexes: the case of a CO 2-N 2 dimer. Phys Chem Chem Phys 2021; 23:10687-10690. [PMID: 33889911 DOI: 10.1039/d1cp90078a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for 'Quantum tunneling dynamical behaviour on weakly bound complexes: the case of a CO2-N2 dimer' by Miguel Lara-Moreno et al., Phys. Chem. Chem. Phys., 2019, 21, 3550-3557, DOI: 10.1039/c8cp04465a.
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Affiliation(s)
| | | | - Philippe Halvick
- Université de Bordeaux, ISM, CNRS UMR 5255, 33405, Talence, France.
| | - Majdi Hochlaf
- Université Gustave Eiffel, COSYS/LISIS, 5 Bd Descartes, 77454 Champs-sur-Marne, France
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Lara-Moreno M, Halvick P, Stoecklin T. Predissociation spectra of the 35Cl -(H 2) complex and its isotopologue 35Cl -(D 2). Phys Chem Chem Phys 2020; 22:25552-25559. [PMID: 33146203 DOI: 10.1039/d0cp05015f] [Citation(s) in RCA: 3] [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: 11/21/2022]
Abstract
The predissociation spectra of the 35Cl-(H2) and 35Cl-(D2) complexes are determined within an accurate quantum approach and compared to those recently measured in an ionic trap at 8 K and 22 K. The calculations are performed using an existing three-dimensional potential energy surface. A variational approach is used for the accurate quantum calculations of the rovibrational bound states. Several methods are compared for the search and the characterization of the resonant states. A good agreement between the calculated and measured spectra is obtained, despite a slight shift to the red of the calculated spectra. The comparison shows that only the ortho or para contribution is observed in the measured 35Cl-(H2) or 35Cl-(D2) spectrum, respectively. Quantum numbers are assigned to the rovibrational resonant states. It demonstrates that the main features observed in the measured predissociation spectra correspond to a progression in the intermonomer vibrational stretching mode.
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Stoecklin T, Denis-Alpizar O, Clergerie A, Halvick P, Faure A, Scribano Y. Rigid-Bender Close-Coupling Treatment of the Inelastic Collisions of H2O with para-H2. J Phys Chem A 2019; 123:5704-5712. [DOI: 10.1021/acs.jpca.9b04052] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thierry Stoecklin
- UMR5255-CNRS, Université de Bordeaux, 351 cours de la libération, F-33405 Talence, France
| | - Otoniel Denis-Alpizar
- Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, El Llano Subercaseaux 2801, San Miguel, Santiago, Chile
| | - Alexandre Clergerie
- UMR5255-CNRS, Université de Bordeaux, 351 cours de la libération, F-33405 Talence, France
| | - Philippe Halvick
- UMR5255-CNRS, Université de Bordeaux, 351 cours de la libération, F-33405 Talence, France
| | - Alexandre Faure
- CNRS, IPAG, Université Grenoble Alpes, F-38000 Grenoble, France
| | - Yohann Scribano
- Laboratoire Univers et Particules de Montpellier, UMR-CNRS 5299, Université de Montpellier, F-34095 Montpellier Cedex, France
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Lara-Moreno M, Stoecklin T, Halvick P. Potential energy surface and rovibrational bound states of the H 2-C 3N - van der Waals complex. Phys Chem Chem Phys 2019; 21:2929-2937. [PMID: 30675889 DOI: 10.1039/c8cp07727d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Since their recent detection in the interstellar medium, anions have raised the question of their possible mechanisms of formation, destruction and excitation. This requires knowledge of their interaction with the most abundant interstellar species. In the present work, a four dimensional rigid rotor model of the potential energy surface is developed for the collision of C3N- with H2. Ab initio calculations are performed with explicitly-correlated coupled-cluster theory via CCSD(T)-F12/aug-cc-pVTZ. Two linear equilibrium structures are found, different in the orientation of C3N-. Two more equilibrium structures, symmetrically equivalent, are obtained by the permutation of H atoms. The vibrational dynamics is mainly controlled by the considerable difference between the two bending frequencies that correspond to the hindered rotations of C3N- and H2. This arises from the potential energy surface which is soft for rotation of C3N- and stiff for rotation of H2, and also from the large difference in mass between both monomers. Although a high potential barrier prevents the rotation of H2, a significant tunneling effect is observed which causes a splitting in the degenerate energy levels. On the contrary, the rotation of C3N- is allowed since the energy of the saddle points is lower than the energy of the bound states, but the wavefunctions remain localized around each linear structure unless a large excitation energy is available.
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Lara-Moreno M, Stoecklin T, Halvick P, Hochlaf M. Quantum tunneling dynamical behaviour on weakly bound complexes: the case of a CO2–N2 dimer. Phys Chem Chem Phys 2019; 21:3550-3557. [DOI: 10.1039/c8cp04465a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The dynamics induced by quantum tunneling is found to be closely connected to the shape of the potentials for weakly bound complexes.
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Affiliation(s)
| | | | | | - Majdi Hochlaf
- Université Paris-Est
- Laboratoire Modélisation et Simulation Multi Echelle
- MSME UMR 8208 CNRS
- 77454 Marne-la-Vallée
- France
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9
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Stoecklin T, Halvick P, Lara-Moreno M, Trabelsi T, Hochlaf M. On the gas-phase formation of the HCO - anion: accurate quantum study of the H - + CO radiative association and HCO radiative electron attachment. Faraday Discuss 2018; 212:101-116. [PMID: 30234209 DOI: 10.1039/c8fd00103k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The hydrogen anion has never been observed in the interstellar medium, but it is most likely present in some interstellar regions. Since direct detection appears especially difficult, improving the knowledge of the astrochemical processes involving this anion should be valuable in defining a way of indirect detection. We present the first study of the radiative association of H- and CO to form the HCO- anion within a quantum time-independent approach. We use a state-of-the-art potential energy surface which has been calculated for the present study. The calculated radiative association rate coefficient is monotonically decreasing from 6 × 10-16 to 5 × 10-19 cm3 per molecule per s across the 0.01-1000 K temperature range. At the typical temperature of the cold interstellar medium, ∼10 K, the radiative association rate is ∼2 × 10-17 cm3 per molecule per s. On the other hand, the plane wave approximation is used to calculate the HCO radiative electron attachment rate coefficient. It is found to be almost constant and also equal to 2 × 10-17 cm3 per molecule per s. Setting aside the question of the abundances of the reactants of both processes, these results demonstrate that among the two gas-phase modes of production of the HCO- anion in cold interstellar medium considered in this study, the H- + CO radiative association is dominating below 10 K while the radiative electron attachment rate is larger above 10 K.
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Affiliation(s)
- Thierry Stoecklin
- Université de Bordeaux, Institut des Sciences Moléculaires, CNRS-UMR5255, 33405 Talence Cedex, France.
| | - Philippe Halvick
- Université de Bordeaux, Institut des Sciences Moléculaires, CNRS-UMR5255, 33405 Talence Cedex, France.
| | - Miguel Lara-Moreno
- Université de Bordeaux, Institut des Sciences Moléculaires, CNRS-UMR5255, 33405 Talence Cedex, France.
| | - Tarek Trabelsi
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, CNRS-UMR8208, 77454 Marne-la-Vallée, France
| | - Majdi Hochlaf
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, CNRS-UMR8208, 77454 Marne-la-Vallée, France
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10
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Abstract
The cyano radical is a ubiquitous molecule and was, for instance, one of the first species detected in astrophysical media such as comets or diffuse clouds. In photodissociation regions, the reaction rate of CN+ + CO → CN + CO+ is one of the critical parameters defining nitrile chemistry. The enthalpy of this charge transfer reaction is defined as the difference of ionization energies (EI) between CN and CO. Although EI(CO) is known accurately, the EI(CN) values are more dispersed and deduced indirectly from thermodynamic thresholds only, all above EI(CO), leading to the assumption that the reaction is fast even at low temperature. Using a combination of synchrotron radiation, electron/ion imaging coincidence techniques, and supporting ab initio calculations, we directly determine the first adiabatic ionization energy of CN at 13.956(7) eV, and we demonstrate that EI(CN) < EI(CO). The findings suggest a very slow reaction in the cold regions of interstellar media.
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Affiliation(s)
- Bérenger Gans
- Institut des Sciences Moléculaires d'Orsay (ISMO), UMR 8214 CNRS, Univ. Paris-Sud, Université Paris-Saclay , F-91405 Orsay, France
| | - Séverine Boyé-Péronne
- Institut des Sciences Moléculaires d'Orsay (ISMO), UMR 8214 CNRS, Univ. 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
| | - Anja Röder
- Institute of Physical and Theoretical Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
| | - Domenik Schleier
- Institute of Physical and Theoretical Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
| | - Philippe Halvick
- Institut des Sciences Moléculaires, UMR 5255 CNRS-Université de Bordeaux , Bât. A12, 351 cours de la Libération, F-33405 Talence 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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Faure A, Halvick P, Stoecklin T, Honvault P, Epée Epée MD, Mezei JZ, Motapon O, Schneider IF, Tennyson J, Roncero O, Bulut N, Zanchet A. State-to-state chemistry and rotational excitation of CH + in photon-dominated regions. Mon Not R Astron Soc 2017; 469:612-620. [PMID: 28690343 PMCID: PMC5500105 DOI: 10.1093/mnras/stx892] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present a detailed theoretical study of the rotational excitation of CH+ due to reactive and nonreactive collisions involving C+(2P), H2, CH+, H and free electrons. Specifically, the formation of CH+ proceeds through the reaction between C+(2P) and H2(νH2 = 1, 2), while the collisional (de)excitation and destruction of CH+ is due to collisions with hydrogen atoms and free electrons. State-to-state and initial-state-specific rate coefficients are computed in the kinetic temperature range 10-3000 K for the inelastic, exchange, abstraction and dissociative recombination processes using accurate potential energy surfaces and the best scattering methods. Good agreement, within a factor of 2, is found between the experimental and theoretical thermal rate coefficients, except for the reaction of CH+ with H atoms at kinetic temperatures below 50 K. The full set of collisional and chemical data are then implemented in a radiative transfer model. Our Non-LTE calculations confirm that the formation pumping due to vibrationally excited H2 has a substantial effect on the excitation of CH+ in photon-dominated regions. In addition, we are able to reproduce, within error bars, the far-infrared observations of CH+ toward the Orion Bar and the planetary nebula NGC 7027. Our results further suggest that the population of νH2 = 2 might be significant in the photon-dominated region of NGC 7027.
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Affiliation(s)
- A. Faure
- Univ. Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
| | - P. Halvick
- Univ. Bordeaux, CNRS, ISM, F-33400 Talence, France
| | - T. Stoecklin
- Univ. Bordeaux, CNRS, ISM, F-33400 Talence, France
| | - P. Honvault
- Univ. Bourgogne Franche-Comté, Laboratoire ICB, F-21078 Dijon, France
| | - M. D. Epée Epée
- UFD Mathématiques, Informatique Appliqúee et Physique Fondamentale, University of Douala, P. O. Box 24157, Douala, Cameroon
| | - J. Zs. Mezei
- Univ. Normandie, CNRS, LOMC, F-76058 Le Havre, France
- LSPM, Univ. Paris 13, 99 avenue Jean-Baptiste Clément, F-93430 Villetaneuse, France
- Univ. Paris-Sud, CNRS, Laboratoire Aimé Cotton, F-91405 Orsay, France
- Institute of Nuclear Research of the Hungarian Academy of Sciences, P.O. Box 51, Debrecen H-4001, Hungary
| | - O. Motapon
- UFD Mathématiques, Informatique Appliqúee et Physique Fondamentale, University of Douala, P. O. Box 24157, Douala, Cameroon
- University of Maroua, Faculty of Science, P. O. Box 814 Maroua, Cameroon
| | - I. F. Schneider
- Univ. Normandie, CNRS, LOMC, F-76058 Le Havre, France
- Univ. Paris-Sud, CNRS, Laboratoire Aimé Cotton, F-91405 Orsay, France
| | - J. Tennyson
- Department of Physics and Astronomy, University College, London, Gower St., London WC1E 6BT, UK
| | - O. Roncero
- Instituto de Física Fundamental, CSIC, C/ Serrano, 123, E-28006 Madrid, Spain
| | - N. Bulut
- Firat University, Department of Physics, 23169 Elazig̃, Turkey
| | - A. Zanchet
- Instituto de Física Fundamental, CSIC, C/ Serrano, 123, E-28006 Madrid, Spain
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Lara-Moreno M, Stoecklin T, Halvick P. Interaction of rigid C3N− with He: Potential energy surface, bound states, and rotational spectrum. J Chem Phys 2017; 146:224310. [DOI: 10.1063/1.4985148] [Citation(s) in RCA: 4] [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: 11/14/2022] Open
Affiliation(s)
- Miguel Lara-Moreno
- Université de Bordeaux, ISM, CNRS UMR 5255, 33405 Talence, France
- Instituto Superior de Tecnologías y Ciencias Aplicadas, Quinta de los Molinos, Plaza de la Revolución, 10600 La Habana, Cuba
| | | | - Philippe Halvick
- Université de Bordeaux, ISM, CNRS UMR 5255, 33405 Talence, France
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13
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Bonnet L, Linguerri R, Hochlaf M, Yazidi O, Halvick P, Francisco JS. Full-Dimensional Theory of Pair-Correlated HNCO Photofragmentation. J Phys Chem Lett 2017; 8:2420-2424. [PMID: 28498666 DOI: 10.1021/acs.jpclett.7b00920] [Citation(s) in RCA: 7] [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: 06/07/2023]
Abstract
Full-dimensional semiclassical dynamical calculations combining classical paths and Bohr quantization of product internal motions are reported for the prototype photofragmentation of isocyanic acid in the S1 state. These calculations allow one to closely reproduce for the first time key features of state-of-the-art imaging measurements at photolysis wavelengths of 201 and 210 nm while providing insight into the underlying dissociation mechanism. Quantum scattering calculations being beyond reach for most polyatomic fissions, pair-correlated data on these processes are much more often measured than predicted. Our theoretical approach can be used to fill this gap.
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Affiliation(s)
- L Bonnet
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS, UMR 5255 , 33405 Talence, France
| | - R Linguerri
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, UMR 8208 CNRS , 5 Bd Descartes, 77454 Marne La Vallée, France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, UMR 8208 CNRS , 5 Bd Descartes, 77454 Marne La Vallée, France
| | - O Yazidi
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, LR01ES09, Faculté des Sciences de Tunis, Université de Tunis El Manar , 2092 Tunis, Tunisia
| | - P Halvick
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS, UMR 5255 , 33405 Talence, France
| | - J S Francisco
- Department of Chemistry, University of Nebraska-Lincoln , 433 Hamilton Hall, Lincoln, Nebraska 68588-0304, United States
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Kłos J, Hapka M, Chałasiński G, Halvick P, Stoecklin T. Theoretical study of the buffer-gas cooling and trapping of CrH(X6Σ+) by3He atoms. J Chem Phys 2016; 145:214305. [DOI: 10.1063/1.4968529] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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)
- Jacek Kłos
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742-2021, USA
| | - Michał Hapka
- Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093 Warsaw, Poland
| | - Grzegorz Chałasiński
- Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093 Warsaw, Poland
| | - Philippe Halvick
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS-UMR 5255, 33405 Talence, France
| | - Thierry Stoecklin
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS-UMR 5255, 33405 Talence, France
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Stoecklin T, Halvick P, Gannouni MA, Hochlaf M, Kotochigova S, Hudson ER. Explanation of efficient quenching of molecular ion vibrational motion by ultracold atoms. Nat Commun 2016; 7:11234. [PMID: 27088647 PMCID: PMC4837476 DOI: 10.1038/ncomms11234] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 03/03/2016] [Indexed: 11/09/2022] Open
Abstract
Buffer gas cooling of molecules to cold and ultracold temperatures is a promising technique for realizing a host of scientific and technological opportunities. Unfortunately, experiments using cryogenic buffer gases have found that although the molecular motion and rotation are quickly cooled, the molecular vibration relaxes at impractically long timescales. Here, we theoretically explain the recently observed exception to this rule: efficient vibrational cooling of BaCl(+) by a laser-cooled Ca buffer gas. We perform intense close-coupling calculations that agree with the experimental result, and use both quantum defect theory and a statistical capture model to provide an intuitive understanding of the system. This result establishes that, in contrast to the commonly held opinion, there exists a large class of systems that exhibit efficient vibrational cooling and therefore supports a new route to realize the long-sought opportunities offered by molecular structure.
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Affiliation(s)
- Thierry Stoecklin
- Université de Bordeaux, Institut des Sciences Moléculaires, UMR 5255 CNRS, 33405 Talence, France
| | - Philippe Halvick
- Université de Bordeaux, Institut des Sciences Moléculaires, UMR 5255 CNRS, 33405 Talence, France
| | - Mohamed Achref Gannouni
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - Majdi Hochlaf
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - Svetlana Kotochigova
- Department of Physics, Temple University, 1925 N 12th Street, Philadelphia, Pennsylvania 19122, USA
| | - Eric R. Hudson
- Department of Physics and Astronomy, University of California, 475 Portola Plaza, Los Angeles, California 90095, USA
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Stoecklin T, Gannouni MA, Jaidane NE, Halvick P, Hochlaf M. Rotational Excitation of the OH(+) Radical by Collision with H at Low Temperature. J Phys Chem A 2015; 119:12599-606. [PMID: 26579973 DOI: 10.1021/acs.jpca.5b09607] [Citation(s) in RCA: 6] [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: 11/28/2022]
Abstract
A ro-vibrationally inelastic close coupling study of the rotational excitation of OH(+)(X(3)Σ(-)) by collisions with H((2)S) is presented. The two lowest potential energy surfaces of doublet and quadruplet spin multiplicity are involved. The former is the one we developed recently, and the latter is a modified version of the quadruplet surface of Martinez et al. to include the long-range charge-induced-dipole potential. The details of the modification of this surface are presented as well as the comparison of the rotational excitation resulting from collisions with hydrogen on these two surfaces. The effect of the coupling between vibration and rotation on the rotational excitation rate is also discussed, as the potential well depth of the doublet surface is quite large and allows the coupling between many vibrational channels of OH(+). As the hydrogen exchange reaction can occur for both potential energy surfaces, we discuss the reliability of the approximation made by the calculation of the cross sections with a quantum dynamics limited to the inelastic process. The relative importance of the collisions on the doublet or quadruplet surface within a given rotational transition is also discussed.
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Affiliation(s)
- T Stoecklin
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université de Bordeaux , 33405 Talence Cedex, France
| | - M A Gannouni
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications - LSAMA, Université de Tunis , Tunis, Tunisia.,Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est , 5 bd Descartes, 77454 Marne-la-Vallée, France
| | - N E Jaidane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications - LSAMA, Université de Tunis , Tunis, Tunisia
| | - P Halvick
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université de Bordeaux , 33405 Talence Cedex, France
| | - M Hochlaf
- Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Université Paris-Est , 5 bd Descartes, 77454 Marne-la-Vallée, France
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Werfelli G, Halvick P, Honvault P, Kerkeni B, Stoecklin T. Low temperature rate coefficients of the H + CH(+) → C(+) + H2 reaction: New potential energy surface and time-independent quantum scattering. J Chem Phys 2015; 143:114304. [PMID: 26395702 DOI: 10.1063/1.4931103] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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 observed abundances of the methylidyne cation, CH(+), in diffuse molecular clouds can be two orders of magnitude higher than the prediction of the standard gas-phase models which, in turn, predict rather well the abundances of neutral CH. It is therefore necessary to investigate all the possible formation and destruction processes of CH(+) in the interstellar medium with the most abundant species H, H2, and e(-). In this work, we address the destruction process of CH(+) by hydrogen abstraction. We report a new calculation of the low temperature rate coefficients for the abstraction reaction, using accurate time-independent quantum scattering and a new high-level ab initio global potential energy surface including a realistic model of the long-range interaction between the reactants H and CH(+). The calculated thermal rate coefficient is in good agreement with the experimental data in the range 50 K-800 K. However, at lower temperatures, the experimental rate coefficient takes exceedingly small values which are not reproduced by the calculated rate coefficient. Instead, the latter rate coefficient is close to the one given by the Langevin capture model, as expected for a reaction involving an ion and a neutral species. Several recent theoretical works have reported a seemingly good agreement with the experiment below 50 K, but an analysis of these works show that they are based on potential energy surfaces with incorrect long-range behavior. The experimental results were explained by a loss of reactivity of the lowest rotational states of the reactant; however, the quantum scattering calculations show the opposite, namely, a reactivity enhancement with rotational excitation.
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Affiliation(s)
- Ghofran Werfelli
- Université de Bordeaux, Institut des Sciences Moléculaires, CNRS UMR 5255, 33405 Talence Cedex, France
| | - Philippe Halvick
- Université de Bordeaux, Institut des Sciences Moléculaires, CNRS UMR 5255, 33405 Talence Cedex, France
| | - Pascal Honvault
- Université de Bourgogne Franche-Comté, Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS UMR 6303, 21078 Dijon Cedex, France
| | - Boutheïna Kerkeni
- Faculté des Sciences de Tunis, Université de Tunis El-Manar, Laboratoire de Physique de la Matière Condensée, 2092 Tunis, Tunisia
| | - Thierry Stoecklin
- Université de Bordeaux, Institut des Sciences Moléculaires, CNRS UMR 5255, 33405 Talence Cedex, France
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Nasri S, Ajili Y, Jaidane NE, Kalugina YN, Halvick P, Stoecklin T, Hochlaf M. Potential energy surface of the CO2-N2 van der Waals complex. J Chem Phys 2015; 142:174301. [PMID: 25956094 DOI: 10.1063/1.4919396] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [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
Four-dimensional potential energy surface (4D-PES) of the atmospherically relevant CO2-N2 van der Waals complex is generated using the explicitly correlated coupled cluster with single, double, and perturbative triple excitation (CCSD(T)-F12) method in conjunction with the augmented correlation consistent triple zeta (aug-cc-pVTZ) basis set. This 4D-PES is mapped along the intermonomer coordinates. An analytic fit of this 4D-PES is performed. Our extensive computations confirm that the most stable form corresponds to a T-shape structure where the nitrogen molecule points towards the carbon atom of CO2. In addition, we located a second isomer and two transition states in the ground state PES of CO2-N2. All of them lay below the CO2 + N2 dissociation limit. This 4D-PES is flat and strongly anisotropic along the intermonomer coordinates. This results in the possibility of the occurrence of large amplitude motions within the complex, such as the inversion of N2, as suggested in the recent spectroscopic experiments. Finally, we show that the experimentally established deviations from the C2v structure at equilibrium for the most stable isomer are due to the zero-point out-of-plane vibration correction.
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Affiliation(s)
- Sameh Nasri
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - Yosra Ajili
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - Nejm-Eddine Jaidane
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications-LSAMA, Université de Tunis El Manar, Tunis, Tunisia
| | - Yulia N Kalugina
- Department of Optics and Spectroscopy, Tomsk State University, 36 Lenin Ave., Tomsk 634050, Russia
| | - Philippe Halvick
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS UMR 5255, 33405 Talence Cedex, France
| | - Thierry Stoecklin
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS UMR 5255, 33405 Talence Cedex, France
| | - Majdi Hochlaf
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
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Al Mogren MM, Denis-Alpizar O, Abdallah DB, Stoecklin T, Halvick P, Senent ML, Hochlaf M. On the use of explicitly correlated treatment methods for the generation of accurate polyatomic –He/H2 interaction potential energy surfaces: The case of C3–He complex and generalization. J Chem Phys 2014; 141:044308. [DOI: 10.1063/1.4890729] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [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)
- M. M. Al Mogren
- Chemistry Department, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Kingdom of Saudi Arabia
| | - O. Denis-Alpizar
- Université de Bordeaux, ISM, CNRS UMR 5255, 33405 Talence Cedex, France
- Departamento de Física, Universidad de Matanzas, Matanzas 40100, Cuba
| | - D. Ben Abdallah
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications – LSAMA Université de Tunis, Tunis, Tunisia and Department of General Studies, Riyadh Corporation of Technology, Technical and Vocational Training Corporation, P.O. Box: 42826, Riyadh 11551, Kingdom of Saudi Arabia
| | - T. Stoecklin
- Université de Bordeaux, ISM, CNRS UMR 5255, 33405 Talence Cedex, France
| | - P. Halvick
- Université de Bordeaux, ISM, CNRS UMR 5255, 33405 Talence Cedex, France
| | - M.-L. Senent
- Departamento de Química y Física Teóricas, Instituto de Estructura de la Materia, IEM-C.S.I.C., Serrano 121, Madrid 28006, Spain
| | - M. Hochlaf
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée, France
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Denis-Alpizar O, Stoecklin T, Halvick P, Dubernet ML. Rotational relaxation of CS by collision with ortho- and para-H2 molecules. J Chem Phys 2014; 139:204304. [PMID: 24289351 DOI: 10.1063/1.4832385] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [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
Quantum mechanical investigation of the rotationally inelastic collisions of CS with ortho- and para-H2 molecules is reported. The new global four-dimensional potential energy surface presented in our recent work is used. Close coupling scattering calculations are performed in the rigid rotor approximation for ortho- and para-H2 colliding with CS in the j = 0-15 rotational levels and for collision energies ranging from 10(-2) to 10(3) cm(-1). The cross sections and rate coefficients for selected rotational transitions of CS are compared with the ones previously reported for the collision of CS with He. The largest discrepancies are observed at low collision energy, below 1 cm(-1). Above 10 cm(-1), the approximation using the square root of the relative mass of the colliders to calculate the cross sections between a molecule and H2 from the data available with (4)He is found to be a good qualitative approximation. The rate coefficients calculated with the electron gas model for the He-CS system show more discrepancy with our accurate results. However, scaling up these rates by a factor of 2 gives a qualitative agreement.
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Lynch GC, Halvick P, Truhlar DG, Garrett BC, Schwenke DW, Kouri DJ. Semiclassical and Quantum Mechanical Calculations of Isotopic Kinetic Branching Ratios for the Reactionof O(3P) with HD. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1989-0512] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Tunneling probabilities for the reactions O + HD → OH + D and O + DH → OD + H have been calculated by semiclassical dynamical methods and compared to accurate quantal calculations for the same potential energy surface. The results are used to test the reliability of variational transition state theory with the least-action semiclassical method for tunneling probabilities for the prediction of intramolecular kinetic isotope effects.
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Affiliation(s)
- Gillian C. Lynch
- Department of Chemistry and Supercomputer Institute, University of Minnesota, Minneapolis, MN 55455, U.S.A
| | - Philippe Halvick
- Department of Chemistry and Supercomputer Institute, University of Minnesota, Minneapolis, MN 55455, U.S.A
| | - Donald G. Truhlar
- Department of Chemistry and Supercomputer Institute, University of Minnesota, Minneapolis, MN 55455, U.S.A
| | - Bruce C. Garrett
- Chemical Dynamics Corporation, 9560 Pennsylvania Avenue, Suite 106, Upper Marlboro, MD 20772, U.S.A
| | - David W. Schwenke
- NASA Ames Research Center, Mail Stop 230-3, Moffett Field, CA 94035, U.S.A
| | - Donald J. Kouri
- Department of Chemistry and Department of Physics, University of Houston, Houston, TX 77204-5641, U.S.A
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Gannouni MA, Jaidane NE, Halvick P, Stoecklin T, Hochlaf M. Accurate global potential energy surface for the H + OH+ collision. J Chem Phys 2014; 140:184306. [DOI: 10.1063/1.4872329] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Denis-Alpizar O, Stoecklin T, Halvick P. Rovibrational energy transfer in the He-C3 collision: Potential energy surface and bound states. J Chem Phys 2014; 140:084316. [DOI: 10.1063/1.4866839] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Stoecklin T, Denis-Alpizar O, Halvick P, Dubernet ML. Ro-vibrational relaxation of HCN in collisions with He: Rigid bender treatment of the bending-rotation interaction. J Chem Phys 2013; 139:124317. [DOI: 10.1063/1.4822296] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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Denis-Alpizar O, Stoecklin T, Halvick P, Dubernet ML. The interaction of He with vibrating HCN: Potential energy surface, bound states, and rotationally inelastic cross sections. J Chem Phys 2013; 139:034304. [DOI: 10.1063/1.4813125] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Lique F, Werfelli G, Halvick P, Stoecklin T, Faure A, Wiesenfeld L, Dagdigian PJ. Spin-orbit quenching of the C+(2P) ion by collisions with para- and ortho-H2. J Chem Phys 2013; 138:204314. [PMID: 23742482 DOI: 10.1063/1.4807311] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Spin-orbit (de-)excitation of C(+)((2)P) by collisions with H2, a key process for astrochemistry, is investigated. Quantum-mechanical calculations of collisions between C(+) ions and para- and ortho-H2 have been performed in order to determine the cross section for the C(+) (2)P3∕2 → (2)P1∕2 fine-structure transition at low and intermediate energies. The calculation are based on new ab initio potential energy surfaces obtained using the multireference configuration interaction method. Corresponding rate coefficients were obtained for temperatures ranging from 5 to 500 K. These rate coefficients are compared to previous estimations, and their impact is assessed through radiative transfer computation. They are found to increase the flux of the (2)P3∕2 → (2)P1∕2 line at 158 μm by up to 30% for typical diffuse interstellar cloud conditions.
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Affiliation(s)
- François Lique
- LOMC - UMR 6294, CNRS-Université du Havre, 25, Rue Philippe Lebon, BP 540, 76058 Le Havre, France.
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Denis-Alpizar O, Stoecklin T, Halvick P, Dubernet ML, Marinakis S. Potential energy surface and rovibrational energy levels of the H2-CS van der Waals complex. J Chem Phys 2012; 137:234301. [DOI: 10.1063/1.4771658] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Ruf H, Handschin C, Ferré A, Thiré N, Bertrand JB, Bonnet L, Cireasa R, Constant E, Corkum PB, Descamps D, Fabre B, Larregaray P, Mével E, Petit S, Pons B, Staedter D, Wörner HJ, Villeneuve DM, Mairesse Y, Halvick P, Blanchet V. High-harmonic transient grating spectroscopy of NO2 electronic relaxation. J Chem Phys 2012; 137:224303. [DOI: 10.1063/1.4768810] [Citation(s) in RCA: 21] [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: 11/14/2022] Open
Affiliation(s)
- H Ruf
- Université de Bordeaux-CNRS-CEA, CELIA, UMR5107, F-33400 Talence, France
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Abstract
We predict the existence of the N(2)H(-) anion from first principle calculations. We present the three-dimensional potential energy surface and the bound states of the N(2)H(-)/D(-) van der Waals anion. The electronic calculations were performed using state-of-the-art ab initio methods and the nuclear motions were solved using a quantum close-coupling scattering theory. A T-shaped equilibrium structure was found, with a well depth of 349.1 cm(-1), where 18 bound states have been located for N(2)H(-) and 25 for N(2)D(-) for total angular momentum J = 0. We also present the absorption spectra of the N(2)H(-) complex. This anion could be formed after low energy collisions between N(2) and H(-) through radiative association. The importance of this prediction in astrophysics and the possible use of N(2)H(-) as a tracer of N(2) and H(-) in the interstellar medium is discussed.
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Affiliation(s)
- François Lique
- LOMC-UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP 540, 76058 Le Havre, France.
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Affiliation(s)
- Philippe Halvick
- Institut des Sciences Moléculaires, Université de Bordeaux, CNRS UMR 5255, 33405 Talence Cedex, France.
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31
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Gans B, Boyé-Péronne S, Broquier M, Delsaut M, Douin S, Fellows CE, Halvick P, Loison JC, Lucchese RR, Gauyacq D. Photolysis of methane revisited at 121.6 nm and at 118.2 nm: quantum yields of the primary products, measured by mass spectrometry. Phys Chem Chem Phys 2011; 13:8140-52. [DOI: 10.1039/c0cp02627a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Jorfi M, Bussery-Honvault B, Honvault P, Stoecklin T, Larrégaray P, Halvick P. Theoretical Sensitivity of the C(3P) + OH(X2Π) → CO(X1Σ+) + H(2S) Rate Constant: The Role of the Long-Range Potential. J Phys Chem A 2010; 114:7494-9. [DOI: 10.1021/jp1037377] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [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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33
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Turpin F, Halvick P, Stoecklin T. The interaction of MnH(X Σ7+) with He:Ab initiopotential energy surface and bound states. J Chem Phys 2010; 132:214305. [DOI: 10.1063/1.3432762] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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34
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Lique F, Jorfi M, Honvault P, Halvick P, Lin SY, Guo H, Xie DQ, Dagdigian PJ, Kłos J, Alexander MH. O+OH-->O(2)+H: A key reaction for interstellar chemistry. New theoretical results and comparison with experiment. J Chem Phys 2010; 131:221104. [PMID: 20001016 DOI: 10.1063/1.3274226] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We report extensive, fully quantum, time-independent (TID) calculations of cross sections at low collision energies and rate constants at low temperatures for the O+OH reaction, of key importance in the production of molecular oxygen in cold, dark, interstellar clouds and in the chemistry of the Earth's atmosphere. Our calculations are compared with TID calculations within the J-shifting approximation, with wave-packet calculations, and with quasiclassical trajectory calculations. The fully quantum TID calculations yield rate constants higher than those from the more approximate methods and are qualitatively consistent with a low-temperature extrapolation of earlier experimental values but not with the most recent experiments at the lowest temperatures.
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Affiliation(s)
- F Lique
- LOMC, Universite du Havre, 25 Rue Philippe Lebon, BP 540, 76 058 Le Havre Cedex, France
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Jorfi M, Honvault P, Halvick P. Quasi-classical determination of integral cross-sections and rate constants for the N+OH→NO+H reaction. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.02.029] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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Jorfi M, Honvault P, Halvick P. Quasiclassical trajectory calculations of differential cross sections and product energy distributions for the N+OH→NO+H reaction. J Chem Phys 2009; 131:094302. [DOI: 10.1063/1.3218843] [Citation(s) in RCA: 20] [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: 11/14/2022] Open
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37
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Jorfi M, Honvault P, Bargueño P, González-Lezana T, Larrégaray P, Bonnet L, Halvick P. On the statistical behavior of the O+OH→H+O[sub 2] reaction: A comparison between quasiclassical trajectory, quantum scattering, and statistical calculations. J Chem Phys 2009; 130:184301. [DOI: 10.1063/1.3128537] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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38
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Jorfi M, Honvault P, Halvick P, Lin S, Guo H. Quasiclassical trajectory scattering calculations for the OH+O→H+O2 reaction: Cross sections and rate constants. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.07.069] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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39
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Zanchet A, Halvick P, Bussery-Honvault B, Honvault P. Differential cross sections and product energy distributions for the C(P3)+OH(XΠ2)→CO(XΣ+1)+H(S2) reaction using a quasiclassical trajectory method. J Chem Phys 2008; 128:204301. [DOI: 10.1063/1.2924124] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zanchet A, Halvick P, Rayez JC, Bussery-Honvault B, Honvault P. Cross sections and rate constants for the C(P3)+OH(XΠ2)→CO(XΣ+1)+H(S2) reaction using a quasiclassical trajectory method. J Chem Phys 2007; 126:184308. [PMID: 17508804 DOI: 10.1063/1.2731788] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
First quasiclassical trajectory calculations have been carried out for the C(3P)+OH(X 2Pi)-->CO(X 1Sigma+)+H(2S) reaction using a recent ab initio potential energy surface for the ground electronic state, X 2A', of HCO/COH. Total and state-specific integral cross sections have been determined for a wide range of collision energies (0.001-1 eV). Then, thermal and state-specific rate constants have been calculated in the 1-500 K temperature range. The thermal rate constant varies from 1.78x10(-10) cm3 s-1 at 1 K down to 5.96x10(-11) cm3 s-1 at 500 K with a maximum value of 3.39x10(-10) cm3 s-1 obtained at 7 K. Cross sections and rate constants are found to be almost independent of the rovibrational state of OH.
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Affiliation(s)
- Alexandre Zanchet
- Laboratoire PALMS, UMR CNRS 6627, University Rennes 1, 35042 Rennes Cedex, France
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Halvick P, Stoecklin T, Larrégaray P, Bonnet L. Cross sections and low temperature rate coefficients for the H + CH+reaction: a quasiclassical trajectory study. Phys Chem Chem Phys 2007; 9:582-90. [PMID: 17242739 DOI: 10.1039/b614787a] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The H + CH(+) reaction is studied by quasiclassical trajectory (QCT) calculations, along with phase space theory (PST) and quantum rigid rotor calculations, employing a global single-valued potential energy surface recently derived by our group. We report QCT total cross sections for each of the three channels, for low collision energies and different reactant rotational quantum numbers. At the lowest collision energies, all cross sections exhibit a capture-like behaviour, as expected from a barrierless reaction. At higher energies, there are important dynamical effects coming from the opening of new channels in the inelastic and reactive exchange collisions. The inelastic cross sections turn out to largely increase, while the reactive abstraction cross sections are declining faster than predicted by the capture theory. A large value of the reactant rotational quantum number tends to suppress these dynamical effects. The QCT rate coefficients are reported for a temperature range from 1-700 K. Below 20 K, the abstraction and exchange QCT rate coefficients are almost constant, as predicted by the capture theory. Above this temperature, the abstraction rate coefficient declines, while the exchange and inelastic rate coefficients are increasing, due to the opening of new channels. A good agreement is observed between the experimental abstraction rate coefficient and the QCT and PST ones. The QCT inelastic results are also compared with those obtained from rigid rotor close coupling (CCRR) calculations in order to check the ability of this approach to provide a reliable estimate of the inelastic rate coefficients for a reactive system without a barrier. The laws of variation as a function of temperature are found to be very similar and the curves are parallel above 20 K. However, reaction is not allowed in the rigid rotor approximation, therefore the CCRR results are about twice as large as their QCT counterparts.
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Affiliation(s)
- Philippe Halvick
- Laboratoire de Physico-Chimie Moléculaire, UMR5803-CNRS, Université Bordeaux I, 351 cours de la Libération, 33405, Talence Cedex, France
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Reignier D, Stoecklin T, Halvick P, Voronin A, Rayez JC. Analytical global potential energy surfaces of the two lowest 2A′ states of NO2. Phys Chem Chem Phys 2001. [DOI: 10.1039/b101507i] [Citation(s) in RCA: 29] [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: 11/21/2022]
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Monnerville M, Péoux G, Briquez S, Halvick P. Three-dimensional time-dependent study of a reaction involving three different heavy atoms and a very deep well: application to the C+NO→CN+O exchange reaction. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00410-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Dannenberg JJ, Liotard D, Halvick P, Rayez JC. Theoretical Studies of High-Spin Organic Molecules. 1. Enhanced Coupling between Multiple Unpaired Electrons. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp953552q] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- J. J. Dannenberg
- Laboratoire de Physicochimie Théorique, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France, and Department of Chemistry, City University of New YorkHunter College and The Graduate School, 695 Park Avenue, New York, New York 10021
| | - Daniel Liotard
- Laboratoire de Physicochimie Théorique, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France, and Department of Chemistry, City University of New YorkHunter College and The Graduate School, 695 Park Avenue, New York, New York 10021
| | - Philippe Halvick
- Laboratoire de Physicochimie Théorique, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France, and Department of Chemistry, City University of New YorkHunter College and The Graduate School, 695 Park Avenue, New York, New York 10021
| | - Jean Claude Rayez
- Laboratoire de Physicochimie Théorique, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France, and Department of Chemistry, City University of New YorkHunter College and The Graduate School, 695 Park Avenue, New York, New York 10021
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Halvick P, Truhlar DG. Erratum: A new diabatic representation of the coupled potential energy surfaces for Na(3p2P)+H2→Na(3s2S)+H2 or NaH+H [J. Chem. Phys. 96, 2895 (1992)]. J Chem Phys 1994. [DOI: 10.1063/1.467282] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bonnet L, Rayez J, Halvick P. A geometric model for the regular dynamical behaviour of collinear three-atom reactions involving an intermediate well. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)e1237-b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Monnerville M, Halvick P, Rayez JC. Collinear quantum wave packet study of exothermic A + BC reactions involving an intermediate complex of linear geometry. Application to the C + NO reaction. ACTA ACUST UNITED AC 1993. [DOI: 10.1039/ft9938901579] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Halvick P, Truhlar DG. A new diabatic representation of the coupled potential energy surfaces for Na(3p 2P)+H2→Na(3s 2S)+H2 or NaH+H. J Chem Phys 1992. [DOI: 10.1063/1.461986] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Lynch GC, Halvick P, Zhao M, Truhlar DG, Yu C, Kouri DJ, Schwenke DW. Converged three‐dimensional quantum mechanical reaction probabilities for the F+H2 reaction on a potential energy surface with realistic entrance and exit channels and comparisons to results for three other surfaces. J Chem Phys 1991. [DOI: 10.1063/1.460198] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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