1
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Jo SM, Venturi S, Sharma MP, Munafò A, Panesi M. Rovibrational-Specific QCT and Master Equation Study on N 2(X 1Σ g+) + O( 3P) and NO(X 2Π) + N( 4S) Systems in High-Energy Collisions. J Phys Chem A 2022; 126:3273-3290. [PMID: 35604650 DOI: 10.1021/acs.jpca.1c10346] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work presents a detailed investigation of the energy-transfer and dissociation mechanisms in N2(X1Σg+) + O(3P) and NO(X2Π) + N(4S) systems using rovibrational-specific quasiclassical trajectory (QCT) and master equation analyses. The complete set of state-to-state kinetic data, obtained via QCT, allows for an in-depth investigation of the Zel'dovich mechanism leading to the formation of NO molecules at microscopic and macroscopic scales. The master equation analysis demonstrates that the low-lying vibrational states of N2 and NO have dominant contributions to the NO formation and the corresponding extinction of N2 through the exchange process. For the considered temperature range, it is found that nearly 50% of the dissociation processes for N2 and NO molecules occur in the quasi-steady-state (QSS) regime, while for the Zel'dovich reaction, the distribution of the reactants does not reach the QSS conditions. Furthermore, using the QSS approximation to model the Zel'dovich mechanism leads to overestimating NO production by more than a factor of 4 in the high-temperature range. The breakdown of this well-known approximation has profound consequences for the approaches that heavily rely on the validity of QSS assumption in hypersonic applications. Finally, the investigation of the rovibrational state population dynamics reveals substantial similarities among different chemical systems for the energy-transfer and the dissociation processes, providing promising physical foundations for the use of reduced-order strategies in other chemical systems without significant loss of accuracy.
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Affiliation(s)
- Sung Min Jo
- Center for Hypersonics and Entry Systems Studies (CHESS), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Simone Venturi
- Center for Hypersonics and Entry Systems Studies (CHESS), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Maitreyee P Sharma
- Center for Hypersonics and Entry Systems Studies (CHESS), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Alessandro Munafò
- Center for Hypersonics and Entry Systems Studies (CHESS), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Marco Panesi
- Center for Hypersonics and Entry Systems Studies (CHESS), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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2
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Hickson KM, Loison JC, Larregaray P, Bonnet L, Wakelam V. An Experimental and Theoretical Investigation of the Gas-Phase C( 3P) + N 2O Reaction. Low Temperature Rate Constants and Astrochemical Implications. J Phys Chem A 2022; 126:940-950. [PMID: 35113561 DOI: 10.1021/acs.jpca.1c10112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction between atomic carbon in its ground electronic state, C(3P), and nitrous oxide, N2O, has been studied below room temperature due to its potential importance for astrochemistry, with both species considered to be present at high abundance levels in a range of interstellar environments. On the experimental side, we measured rate constants for this reaction over the 50-296 K range using a continuous supersonic flow reactor. C(3P) atoms were generated by the pulsed photolysis of carbon tetrabromide at 266 nm and were detected by pulsed laser-induced fluorescence at 115.8 nm. Additional measurements allowing the major product channels to be elucidated were also performed. On the theoretical side, statistical rate theory was used to calculate low temperature rate constants. These calculations employed the results of new electronic structure calculations of the 3A″ potential energy surface of CNNO and provided a basis to extrapolate the measured rate constants to lower temperatures and pressures. The rate constant was found to increase monotonically as the temperature falls (kC(3P)+N2O (296 K) = (3.4 ± 0.3) × 10-11 cm3 s-1), reaching a value of kC(3P)+N2O (50 K) = (7.9 ± 0.8) × 10-11 cm3 s-1 at 50 K. As current astrochemical models do not include the C + N2O reaction, we tested the influence of this process on interstellar N2O and other related species using a gas-grain model of dense interstellar clouds. These simulations predict that N2O abundances decrease significantly at intermediate times (103 - 105 years) when gas-phase C(3P) abundances are high.
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Affiliation(s)
- Kevin M Hickson
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | | | - Pascal Larregaray
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Laurent Bonnet
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
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3
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Wang YX, Zhang H, Cheng XL. Computational study on the reaction collisions for the state-to-state process of N( 4S)+NO( 2Π)→O( 3P)+N 2( X1Σ +g). Mol Phys 2021. [DOI: 10.1080/00268976.2021.1969044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Ya-Xin Wang
- College of Physics, Sichuan University, Chengdu, People’s Republic of China
| | - Hong Zhang
- College of Physics, Sichuan University, Chengdu, People’s Republic of China
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, People’s Republic of China
| | - Xin-Lu Cheng
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, People’s Republic of China
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4
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Hong Q, Bartolomei M, Esposito F, Coletti C, Sun Q, Pirani F. Reconciling experimental and theoretical vibrational deactivation in low-energy O + N 2 collisions. Phys Chem Chem Phys 2021; 23:15475-15479. [PMID: 34156045 DOI: 10.1039/d1cp01976g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics calculations of inelastic collisions of atomic oxygen with molecular nitrogen are known to show orders of magnitude discrepancies with experimental results in the range from room temperature to many thousands of degrees Kelvin. In this work, we have achieved an unprecedented quantitative agreement with experiments even at low temperature, by including a non-adiabatic treatment involving vibronic states on newly developed potential energy surfaces. This result paves the way for the calculation of accurate and detailed databases of vibrational energy exchange rates for this collisional system. This is bound to have an impact on air plasma simulations under a wide range of conditions and on the development of Very Low Earth Orbit (VLEO) satellites, operating in the low thermosphere, objects of great technological interest due to their potential at a competitive cost.
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Affiliation(s)
- Qizhen Hong
- State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China and School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | | | - Fabrizio Esposito
- Consiglio Nazionale delle Ricerche, Istituto per la Scienza e Tecnologia dei Plasmi, Sede Secondaria di Bari, via Amendola 122/D 70126 Bari, Italy
| | - Cecilia Coletti
- Dipartimento di Farmacia, Università G. d'Annunzio Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Quanhua Sun
- State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China and School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
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5
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Singh N, Schwartzentruber T. Non-Boltzmann vibrational energy distributions and coupling to dissociation rate. J Chem Phys 2020; 152:224301. [DOI: 10.1063/1.5142732] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Affiliation(s)
- Narendra Singh
- Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Thomas Schwartzentruber
- Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, Minnesota 55455, USA
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6
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Koner D, Bemish RJ, Meuwly M. Dynamics on Multiple Potential Energy Surfaces: Quantitative Studies of Elementary Processes Relevant to Hypersonics. J Phys Chem A 2020; 124:6255-6269. [DOI: 10.1021/acs.jpca.0c01870] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debasish Koner
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
| | - Raymond J. Bemish
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117, United States
| | - Markus Meuwly
- Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
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7
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Koner D, San Vicente Veliz JC, Bemish RJ, Meuwly M. Accurate reproducing kernel-based potential energy surfaces for the triplet ground states of N2O and dynamics for the N + NO ↔ O + N2 and N2 + O → 2N + O reactions. Phys Chem Chem Phys 2020; 22:18488-18498. [DOI: 10.1039/d0cp02509g] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Reproducing kernel-based potential energy surface based on MRCI+Q/aug-cc-pVTZ energies for the triplet states of N2O and quasiclassical dynamical study for the reaction, dissociation and vibrational relaxation.
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Affiliation(s)
- Debasish Koner
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
| | | | - Raymond J. Bemish
- Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland AFB
- USA
| | - Markus Meuwly
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
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8
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Jambrina PG, Menéndez M, Zanchet A, García E, Aoiz FJ. Λ-Doublet Propensities for Reactions on Competing A′ and A″ Potential Energy Surfaces: O(3P) + N2 and O(3P) + HCl. J Phys Chem A 2018; 122:2739-2750. [DOI: 10.1021/acs.jpca.7b11826] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pablo G. Jambrina
- Departamento de Química Física Aplicada, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - M. Menéndez
- Departamento de Química Física I, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - A. Zanchet
- Departamento de Química Física I, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - E. García
- Departamento de Quimica Fisica, Universidad del Pais Vasco (UPV/EHU), 01006 Vitoria, Spain
| | - F. J. Aoiz
- Departamento de Química Física I, Universidad Complutense de Madrid, 28040, Madrid, Spain
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9
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Luo H, Kulakhmetov M, Alexeenko A. Ab initiostate-specific N2+ O dissociation and exchange modeling for molecular simulations. J Chem Phys 2017; 146:074303. [DOI: 10.1063/1.4975770] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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Denis-Alpizar O, Bemish RJ, Meuwly M. Reactive collisions for NO(2Π) + N(4S) at temperatures relevant to the hypersonic flight regime. Phys Chem Chem Phys 2017; 19:2392-2401. [DOI: 10.1039/c6cp07142b] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rate coefficients for the NO(2Π) + N(4S) reaction at high temperatures from quasiclassical trajectories using MRCI+Q PESs of the lowest triplet states.
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Affiliation(s)
- Otoniel Denis-Alpizar
- Department of Chemistry
- University of Basel
- Klingelbergstrasse 80
- CH-4056 Basel
- Switzerland
| | - Raymond J. Bemish
- Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland AFB
- USA
| | - Markus Meuwly
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
- Department of Chemistry
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11
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Manivannan V, Padmanaban R. Quantum wavepacket dynamics of the N( 4S) + NO( X2Π) reaction and its isotopic variants: Integral cross sections and thermal rate constants. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.06.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Lin W, Meana-Pañeda R, Varga Z, Truhlar DG. A quasiclassical trajectory study of the N2(X1Σ) + O(3P) → NO(X2Π) + N(4S) reaction. J Chem Phys 2016; 144:234314. [DOI: 10.1063/1.4954042] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Wei Lin
- Department of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Rubén Meana-Pañeda
- Department of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Zoltan Varga
- Department of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Donald G. Truhlar
- Department of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
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13
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Lin W, Varga Z, Song G, Paukku Y, Truhlar DG. Global triplet potential energy surfaces for the N2(X(1)Σ) + O((3)P) → NO(X(2)Π) + N((4)S) reaction. J Chem Phys 2016; 144:024309. [PMID: 26772573 DOI: 10.1063/1.4938241] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This work presents two global triplet potential energy surfaces (PESs) for the high-energy reaction N2(X(1)Σ) + O((3)P) → NO(X(2)Π) + N((4)S)-in particular, for the lowest energy (3)A' and (3)A″ PESs. In order to obtain the energies needed for fitting analytic surfaces, we carried out multireference configuration interaction (MRCI) calculations based on wave functions obtained from state-averaged complete active space self-consistent field calculations for 2280 geometries for the three lowest (3)A″ states and for 2298 geometries for the three lowest (3)A' states. The lowest-energy (3)A' and (3)A″ states at each of these geometries were then improved by applying the dynamically scaled external correlation (DSEC) method to all MRCI points, and the resulting DSEC energies were used for construction of the ground-state PES for each symmetry. The many-body component of the DSEC energies for the three-dimensional (3)A' and (3)A″ PESs was then least-squares fitted in terms of permutationally invariant polynomials in mixed exponential-Gaussian bond order variables. The global and local minima as well as the transition structures of both the (3)A' and the (3)A″ analytic PES were explored. In agreement with previous work, we find that the reverse reaction is barrierless on the (3)A″ surface along the minimum energy pathway. However, we have explored several new local minima and transition structures on the (3)A' PES. Furthermore, based on the newly found minima and transition structures, two independent reaction mechanisms have been illustrated for the reaction path on the (3)A' PES. The analytic surfaces may be used for dynamics calculations of electronically adiabatic reactive scattering and energy transfer.
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Affiliation(s)
- Wei Lin
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Zoltan Varga
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Guoliang Song
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Yuliya Paukku
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Donald G Truhlar
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
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14
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Varga Z, Meana-Pañeda R, Song G, Paukku Y, Truhlar DG. Potential energy surface of triplet N2O2. J Chem Phys 2016; 144:024310. [DOI: 10.1063/1.4939008] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Zoltan Varga
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Rubén Meana-Pañeda
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Guoliang Song
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Yuliya Paukku
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
| | - Donald G. Truhlar
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
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15
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Reactivity and Relaxation of Vibrationally/Rotationally Excited Molecules with Open Shell Atoms. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/978-1-4419-8185-1_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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16
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N2, O2, NO state-to-state vibrational kinetics in hypersonic boundary layers: The problem of rescaling rate coefficients to uniform vibrational ladders. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2014.11.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Quantum mechanical and quasiclassical Born–Oppenheimer dynamics of the reaction N2 on the N2O and surfaces. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.05.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Defazio P, Gamallo P, Petrongolo C. Nonadiabatic dynamics of O(1D) + N2(XΣg+1)→O(3P) + N2(XΣg+1) on three coupled potential surfaces: Symmetry, Coriolis, spin-orbit, and Renner-Teller effects. J Chem Phys 2012; 136:054308. [DOI: 10.1063/1.3682467] [Citation(s) in RCA: 15] [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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19
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Gamallo P, Martínez R, Sayós R, González M. Quasiclassical dynamics and kinetics of the N+NO→N2+O, NO+N atmospheric reactions. J Chem Phys 2010; 132:144304. [DOI: 10.1063/1.3364867] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Jorfi M, Honvault P. State-to-State Quantum Reactive Scattering Calculations and Rate Constant for Nitrogen Atoms in Collision with NO Radicals at Low Temperatures. J Phys Chem A 2009; 113:10648-51. [DOI: 10.1021/jp907865a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Jorfi
- Institut UTINAM, UMR CNRS 6213, University of Franche-Comté, 25030 Besançon Cedex, France
| | - P. Honvault
- Institut UTINAM, UMR CNRS 6213, University of Franche-Comté, 25030 Besançon Cedex, France
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21
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Bergeat A, Hickson KM, Daugey N, Caubet P, Costes M. A low temperature investigation of the N(4S°) + NO reaction. Phys Chem Chem Phys 2009; 11:8149-55. [DOI: 10.1039/b905702a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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22
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Martínez R, Sierra JD, Gray SK, González M. Time dependent quantum dynamics study of the O++H2(v=0,j=0)→OH++H ion-molecule reaction and isotopic variants (D2,HD). J Chem Phys 2006; 125:164305. [PMID: 17092071 DOI: 10.1063/1.2359727] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The time dependent real wave packet method using the helicity decoupling approximation was used to calculate the cross section evolution with collision energy (excitation function) of the O++H2(v=0,j=0)-->OH++H reaction and its isotopic variants with D2 and HD, using the best available ab initio analytical potential energy surface. The comparison of the calculated excitation functions with exact quantum results and experimental data showed that the present quantum dynamics approach is a very useful tool for the study of the selected and related systems, in a quite wide collision energy interval (approximately 0.0-1.1 eV), involving a much lower computational cost than the quantum exact methods and without a significant loss of accuracy in the cross sections.
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Affiliation(s)
- Rodrigo Martínez
- Departmento de Química, Universidad de La Rioja, C/Madre de Dios 51, 26006 Logroño, Spain
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23
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Gamallo P, Sayós R, González M, Petrongolo C, Defazio P. Quantum real wave-packet dynamics of the N(S4)+NO(X̃Π2)→N2(X̃Σg+1)+O(P3) reaction on the ground and first excited triplet potential energy surfaces: Rate constants, cross sections, and product distributions. J Chem Phys 2006; 124:174303. [PMID: 16689567 DOI: 10.1063/1.2186643] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The reaction N+NO-->N(2)+O was studied by means of the time-dependent real wave-packet (WP) method and the J-shifting approximation. We consider the ground 1 (3)A(") and first excited 1 (3)A(') triplet states, which correlate with both reactants and products, using analytical potential energy surfaces (PESs) recently developed in our group. This work extends our previous quantum dynamics study, and probabilities, cross sections, and rate constants were calculated and interpreted on the basis of the different shapes of the PESs (barrierless 1 (3)A(") and with barrier 1 (3)A(') surfaces, respectively). The WP rate constant (k(1)) shows a weak dependence on T(200-2500 K), as the dominant contribution to reactivity is provided by the barrierless ground PES. There is a good agreement of WP k(1) with the measurements and variational transition state theory (VTST) data, and also between the WP and VTST k(1)(1 (3)A(")) results. Nevertheless, there is a large discrepancy between the WP and VTST k(1)(1 (3)A(')) results. Product state distributions were also calculated for the much more reactive 1 (3)A(") PES. There is an excellent agreement with the experimental average fraction of vibrational energy in N(2)(25+/-3%), the only measured dynamics property of this reaction.
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Affiliation(s)
- Pablo Gamallo
- Departament de Química Física i Centre de Recerca en Química Teòrica, Universitat de Barcelona i Parc Científic de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain
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24
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Nakayama T, Takahashi K, Matsumi Y, Shibuya K. N(4S) formation following the 193.3-nm ArF laser irradiation of NO and NO2 and its application to kinetic studies of N(4S) reactions with NO and NO2. J Phys Chem A 2005; 109:10897-902. [PMID: 16331933 DOI: 10.1021/jp054089c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Formation of the ground-state nitrogen atom, N((4)S), following 193.3-nm ArF laser irradiation of NO and NO(2) was detected directly by a technique of laser-induced fluorescence (LIF) spectroscopy at 120.07 nm. Tunable vacuum ultraviolet (VUV) laser radiation around 120.07 nm was generated by two-photon resonance four-wave sum frequency mixing in Hg vapor. Photoexcitation processes of NO and NO(2) giving rise to the N((4)S) formation are discussed on the basis of the Doppler profiles of the nascent N((4)S) atoms produced from the photolysis of NO and NO(2) and the photolysis laser-power dependence of the N((4)S) signal intensities. Using laser flash photolysis and vacuum ultraviolet laser-induced fluorescence detection, the kinetics of the reactions of N((4)S) with NO and NO(2) have been investigated at 295 +/- 2 K. The rate constants for the reactions of N((4)S) with NO and NO(2) were determined to be (3.8 +/- 0.2) x 10(-11) and (7.3 +/- 0.9) x 10(-12) cm(3) molecule(-1) s(-1), respectively, where the quoted uncertainties are 2sigma statistical uncertainty including estimated systematic error.
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Affiliation(s)
- Tomoki Nakayama
- Solar-Terrestrial Environment Laboratory and Graduate School of Science, Nagoya University, Honohara 3-13, Toyokawa, Aichi 442-8507, Japan
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Troya D, Millán J, Baños I, González M. Ab initiopotential energy surface, variational transition state theory, and quasiclassical trajectory studies of the F+CH4→HF+CH3 reaction. J Chem Phys 2004; 120:5181-91. [PMID: 15267389 DOI: 10.1063/1.1637035] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work we present a study of the F+CH(4)-->HF+CH(3) reaction (DeltaHdegrees(298 K)=-32.0 kcal mol(-1)) using different methods of the chemical reaction theory. The ground potential energy surface (PES) is characterized using several ab initio methods. Full-dimensional rate constants have been calculated employing the variational transition state theory and using directly ab initio data. A triatomic analytical representation of the ground PES was derived from ab initio points calculated at the second- and fourth-order Møller-Plesset levels with the 6-311+G(2df,2pd) basis set, assuming the CH(3) fragment to be a 15 a.m.u. pseudoatom in the fitting process. This is suggested from experiments that indicate that the methyl group is uncoupled to the reaction coordinate. A dynamics study by means of the quasiclassical trajectory (QCT) method and employing this analytical surface was also carried out. The experimental data available on the HF internal states distributions are reproduced by the QCT results. Very recent experimental information about the reaction stereodynamics is also borne out by our QCT calculations. Comparisons with the benchmark F+H(2) and analogous Cl+CH(4) reactions are established throughout.
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Affiliation(s)
- Diego Troya
- Departamento de Quimica, Universidad de La Rioja, C/Madre de Dios 51, 26006 Logroño, Spain
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Martínez R, Millán J, Gonzalez M. Ab initio analytical potential energy surface and quasiclassical trajectory study of the O+(4S)+H2(X 1Σg+)→OH+(X 3Σ−)+H(2S) reaction and isotopic variants. J Chem Phys 2004; 120:4705-14. [PMID: 15267331 DOI: 10.1063/1.1638735] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
An analytical potential energy surface (PES) representation of the O(+)((4)S)+H(2)(X (1)Sigma(g) (+)) system was developed by fitting around 600 CCSD(T)/cc-pVQZ ab initio points. Rate constant calculations for this reaction and its isotopic variants (D(2) and HD) were performed using the quasiclassical trajectory (QCT) method, obtaining a good agreement with experimental data. Calculations conducted to determine the cross section of the title reaction, considering collision energies (E(T)) below 0.3 eV, also led to good accord with experiments. This PES appears to be suitable for kinetics and dynamics studies. Moreover, the QCT results show that, although the hypotheses of a widely used capture model are not satisfied, the resulting expression for the cross section can be applied within a suitable E(T) interval, due to errors cancellation. This could be a general situation regarding the application of this simple model to ion-molecule processes.
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Affiliation(s)
- Rodrigo Martínez
- Departamento de Quimica, Universidad de La Rioja, C/Madre de Dios, 51. 26006 Logrono, Spain
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Gamallo P, González M, Sayós R, Petrongolo C. Quantum wave packet dynamics of the 1 3A″ N(4S)+NO(X̃ 2Π)→N2(X̃ 1Σg+)+O(3P) reaction. J Chem Phys 2003. [DOI: 10.1063/1.1606672] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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