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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] [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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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] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Lique F, Halvick P, Stoecklin T, Hochlaf M. Prediction of the existence of the N2H- molecular anion. J Chem Phys 2012; 136:244302. [PMID: 22755569 DOI: 10.1063/1.4730036] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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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Halvick P, Stoecklin T, Lique F, Hochlaf M. Explicitly correlated treatment of the Ar–NO+ cation. J Chem Phys 2011; 135:044312. [PMID: 21806124 DOI: 10.1063/1.3614502] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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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] [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] [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] [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] [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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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] [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] [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] [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] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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40
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Halvick P. A multiconfigurational approach of the symmetry breaking problem in the cyclic C3H radical. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.07.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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41
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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] [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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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] [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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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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45
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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46
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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48
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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50
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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