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Crisci L, Di Grande S, Cavallotti C, Barone V. Toward an Accurate Black-Box Tool for the Kinetics of Gas-Phase Reactions Involving Barrier-less Elementary Steps. J Chem Theory Comput 2023; 19:7626-7639. [PMID: 37880932 PMCID: PMC10653117 DOI: 10.1021/acs.jctc.3c00857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 10/06/2023] [Accepted: 10/13/2023] [Indexed: 10/27/2023]
Abstract
An enhanced computational protocol has been devised for the accurate characterization of gas-phase barrier-less reactions in the framework of the reaction-path (RP) and variable reaction coordinate variational transition-state theory. In particular, the synergistic combination of density functional theory and Monte Carlo sampling to optimize reactive fluxes led to a reliable yet effective computational workflow. A black-box strategy has been developed for selecting the most suited density functional with reference to a high-level one-dimensional reference potential. At the same time, different descriptions of hindered rotations are automatically selected, depending on the corresponding harmonic frequencies along the RP. The performance of the new tool is investigated by means of two prototypical reactions involving different degrees of static and dynamic correlation, namely, H2S + Cl and CH3 + CH3. The remarkable agreement of the computed kinetic parameters with the available experimental data confirms the accuracy and robustness of the proposed approach. Together with their intrinsic interest, these results also pave the way toward systematic investigations of gas-phase reactions involving barrier-less elementary steps by a reliable, user-friendly tool, which can be confidently used also by nonspecialists.
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Affiliation(s)
- Luigi Crisci
- Scuola
Normale Superiore di Pisa, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
- Department
of Chemical Sciences, University of Napoli
Federico II, Complesso Universitario di M.S. Angelo, via Cintia 21, I-80126 Napoli, Italy
| | - Silvia Di Grande
- Scuola
Normale Superiore di Pisa, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
- Scuola
Superiore Meridionale, Largo San Marcellino 10, I-80138 Napoli, Italy
| | - Carlo Cavallotti
- Department
of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, I-20131 Milano, Italy
| | - Vincenzo Barone
- Scuola
Normale Superiore di Pisa, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
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Blitz MA, Onel L, Robertson SH, Seakins PW. Studies on the Kinetics of the CH + H 2 Reaction and Implications for the Reverse Reaction, 3CH 2 + H. J Phys Chem A 2023; 127:2367-2375. [PMID: 36857400 PMCID: PMC10026075 DOI: 10.1021/acs.jpca.2c08097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
The reaction of CH radicals with H2 has been studied by the use of laser flash photolysis, probing CH decays under pseudo-first-order conditions using laser-induced fluorescence (LIF) over the temperature range 298-748 K at pressures of ∼5-100 Torr. Careful data analysis was required to separate the CH LIF signal at ∼428 nm from broad background fluorescence, and this interference increased with temperature. We believe that this interference may have been the source of anomalous pressure behavior reported previously in the literature (Brownsword, R. A.; J. Chem. Phys. 1997, 106, 7662-7677). The rate coefficient k1 shows complex behavior: at low pressures, the main route for the CH3* formed from the insertion of CH into H2 is the formation of 3CH2 + H, and as the pressure is increased, CH3* is increasingly stabilized to CH3. The kinetic data on CH + H2 have been combined with experimental shock tube data on methyl decomposition and literature thermochemistry within a master equation program to precisely determine the rate coefficient of the reverse reaction, 3CH2 + H → CH + H2. The resulting parametrization is kCH2+H(T) = (1.69 ± 0.11) × 10-10 × (T/298 K)(0.05±0.010) cm3 molecule-1 s-1, where the errors are 1σ.
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Affiliation(s)
- Mark A Blitz
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
- NCAS, University of Leeds, Leeds LS2 9JT, U.K
| | - Lavinia Onel
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | | | - Paul W Seakins
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
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Nguyen TL, Perera A. Reaction of Methylidyne with Ethane: The C-C Insertion Is Unimportant. J Phys Chem A 2022; 126:1966-1972. [PMID: 35302775 DOI: 10.1021/acs.jpca.2c00735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
High-accuracy coupled-cluster calculations in combination with the E,J-resolved master-equation analysis are used to study the reaction mechanism and kinetics of methylidyne with ethane. This reaction plays an important role in the combustion of hydrocarbon fuels and in interstellar chemistry. Two distinct mechanisms, the C-C and the C-H insertions of CH in C2H6, are characterized. The C-C insertion pathway is identified to have a large barrier of 34.5 kcal mol-1 and hence plays no significant role in kinetics. The C-H insertion pathway is found to have no barrier, leading to a highly vibrationally excited n-C3H7 radical, which rapidly dissociates (within 50 ps) to yield CH3 + C2H4 and H + C3H6 in a roughly 7:3 ratio. These findings are in good agreement with an experimental result that indicates that about 20% of the reaction goes to H + C3H6. The reaction of the electronically excited quartet state of the CH radical with C2H6 is examined for the first time and found to proceed as a direct H-abstraction via a small barrier of 0.4 kcal mol-1 to yield triplet CH2 and C2H5. The reaction on the quartet state surface is negligibly slow at low temperatures characteristic of interstellar environments but becomes important at high combustion temperatures.
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Affiliation(s)
- Thanh Lam Nguyen
- Quantum Theory Project, Departments of Chemistry and Physics, University of Florida, Gainesville, Florida 32611, United States
| | - Ajith Perera
- Quantum Theory Project, Departments of Chemistry and Physics, University of Florida, Gainesville, Florida 32611, United States
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Mazarei E, Mousavipour SH. A Theoretical Study on the Dynamics of the Reaction of CH Radicals with Water. J Phys Chem A 2017; 121:8033-8047. [DOI: 10.1021/acs.jpca.7b05504] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elham Mazarei
- Department of Chemistry,
College of Science, Shiraz University, Shiraz, Iran
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Nguyen HMT, Nguyen HT, Nguyen TN, Van Hoang H, Vereecken L. Theoretical Study on the Reaction of the Methylidyne Radical, CH(X2Π), with Formaldehyde, CH2O. J Phys Chem A 2014; 118:8861-71. [DOI: 10.1021/jp506175k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Hue Minh Thi Nguyen
- Faculty of Chemistry
and Center for Computational Science, Hanoi National University of Education, Hanoi, Vietnam
| | - Huu Tho Nguyen
- College of Education—Gia Lai, 126 Le Thanh Ton, Pleiku, Gia Lai, Vietnam
| | - Trong-Nghia Nguyen
- School of Chemical
Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
| | - Hung Van Hoang
- Faculty of Chemistry
and Center for Computational Science, Hanoi National University of Education, Hanoi, Vietnam
| | - Luc Vereecken
- Theoretical
Atmospheric Chemistry, Max Planck Institute for Chemistry, 55128 Mainz, Germany
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Blitz MA, Seakins PW. Laboratory studies of photochemistry and gas phase radical reaction kinetics relevant to planetary atmospheres. Chem Soc Rev 2012; 41:6318-47. [DOI: 10.1039/c2cs35204d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Blitz MA, Talbi D, Seakins PW, Smith IWM. Rate Constants and Branching Ratios for the Reaction of CH Radicals with NH3: A Combined Experimental and Theoretical Study. J Phys Chem A 2011; 116:5877-85. [DOI: 10.1021/jp209383t] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mark A. Blitz
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, United Kingdom LS2 9JT
| | - Dahbia Talbi
- LUPM, Université de Montpelier II, CNRS, Place Eugène Bataillon, 34095 Montpelier cedex 05, France
| | - Paul W. Seakins
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, United Kingdom LS2 9JT
| | - Ian W. M. Smith
- LUPM, Université de Montpelier II, CNRS, Place Eugène Bataillon, 34095 Montpelier cedex 05, France
- University Chemical Laboratories, Lensfield Road, Cambridge, United Kingdom CB2 1EW
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Hébrard E, Dobrijevic M, Pernot P, Carrasco N, Bergeat A, Hickson KM, Canosa A, Le Picard SD, Sims IR. How Measurements of Rate Coefficients at Low Temperature Increase the Predictivity of Photochemical Models of Titan’s Atmosphere. J Phys Chem A 2009; 113:11227-37. [DOI: 10.1021/jp905524e] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - P. Pernot
- Laboratoire de Chimie Physique, UMR 8000, CNRS-Université Paris-Sud 11, Bât. 349, Orsay, F-91405, France
| | - N. Carrasco
- Laboratoire Atmosphères, Milieux, Observations Spatiales, UMR 8190, CNRS-IPSL-Université de Versailles Saint Quentin, BP 3, Verrières le Buisson, F-91371, France
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Loison JC, Bergeat A. Rate constants and the H atom branching ratio of the reactions of the methylidyne CH(X2Π) radical with C2H2, C2H4, C3H4(methylacetylene and allene), C3H6(propene) and C4H8(trans-butene). Phys Chem Chem Phys 2009; 11:655-64. [DOI: 10.1039/b812810c] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gannon KL, Blitz MA, Pilling MJ, Seakins PW, Klippenstein SJ, Harding LB. Kinetics and product branching ratios of the reaction of (1)CH2 with H2 and D2. J Phys Chem A 2008; 112:9575-83. [PMID: 18714945 DOI: 10.1021/jp803038s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactions of singlet methylene (a(1)A1 (1)CH2) with hydrogen and deuterium have been studied by experimental and theoretical techniques. The rate coefficients for the removal of singlet methylene with H2 (k1) and D2 (k2) have been measured from 195 to 798 K and are essentially temperature-independent with values of k1 = (10.48 +/- 0.32) x 10(-11) cm(3) molecule(-1) s(-1) and k2 = (5.98 +/- 0.34) x 10(-11) cm(3) molecule(-1) s(-1), where the errors represent 2sigma, giving a ratio of k1/k2 = 1.75 +/- 0.11. In the reaction with H2, singlet methylene can be removed by reaction giving CH3 + H or deactivated to ground-state triplet methylene. Direct measurement of the H atom product showed that the fraction of relaxation decreased from 0.3 at 195 K to essentially zero at 398 K. For the reaction with deuterium, either H or D may be eliminated. Experimentally, the H:D ratio was determined to be 1.8 +/- 0.5 over the range 195-398 K. Theoretically, the reaction kinetics has been predicted with variable reaction coordinate transition state theory and with rigid-body trajectory simulations employing various high-level, ab initio-determined potential energy surfaces. The magnitudes of the calculated rate coefficients are in agreement with experiment, but the calculations show a significant negative temperature dependence that is not observed in the experimental results. The calculated and experimental H to D ratios from the reaction of singlet methylene with D2 are in good agreement, suggesting that the reaction proceeds entirely through the formation of a long-lived methane intermediate with a statistical distribution of energy.
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Affiliation(s)
- K L Gannon
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
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Loison JC, Bergeat A, Caralp F, Hannachi Y. Rate Constants and H Atom Branching Ratios of the Gas-Phase Reactions of Methylidyne CH(X2Π) Radical with a Series of Alkanes. J Phys Chem A 2006; 110:13500-6. [PMID: 17165876 DOI: 10.1021/jp065831r] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of the CH radical with several alkanes were studied, at room temperature, in a low-pressure fast-flow reactor. CH(X2Pi, v = 0) radicals were obtained from the reaction of CHBr(3) with potassium atoms. The overall rate constants at 300 K are (0.76 +/- 0.20) x 10(-10) [Fleurat-Lessard, P.; Rayez, J. C.; Bergeat, A.; Loison, J. C. Chem. Phys. 2002, 279, 87],1 (1.60 +/- 0.60) x 10(-10)[Galland, N.; Caralp, F.; Hannachi, Y.; Bergeat, A.; Loison, J.-C. J. Phys. Chem. A 2003, 107, 5419],2 (2.20 +/- 0.80) x 10(-10), (2.80 +/- 0.80) x 10(-10), (3.20 +/- 0.80) x 10(-10), (3.30 +/- 0.60) x 10(-10), and (3.60 +/- 0.80) x 10(-10) cm3 molecule(-1) s(-1), (errors refer to +/-2sigma) for methane, ethane, propane, n-butane, n-pentane, neo-pentane, and n-hexane respectively. The experimental overall rate constants correspond to those obtained using a simple classical capture theory. Absolute atomic hydrogen production was determined by V.U.V. resonance fluorescence, with H production from the CH + CH4 reaction being used as a reference. Observed H branching ratios were for CH4, 1.00[Fleurat-Lessard, P.; Rayez, J. C.; Bergeat, A.; Loison, J. C. Chem. Phys. 2002, 279, 87];1 C(2)H(6), 0.22 +/- 0.08 [Galland, N.; Caralp, F.; Hannachi, Y.; Bergeat, A.; Loison, J.-C. J. Phys. Chem. A 2003, 107, 5419];2 C(3)H(8), 0.19 +/- 0.07; C(4)H(10) (n-butane), 0.14 +/- 0.06; C(5)H(12) (n-pentane), 0.52 +/- 0.08; C(5)H(12) (neo-pentane), 0.51 +/- 0.08; C(5)H(12) (iso-pentane), 0.12 +/- 0.06; C(6)H(14) (n-hexane), 0.06 +/- 0.04.
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Affiliation(s)
- Jean-Christophe Loison
- Laboratoire de Physico-Chimie Moléculaire, CNRS UMR 5803, Université Bordeaux I, F-33405 Talence Cedex, France.
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Blitz MA, Hughes KJ, Pilling MJ, Robertson SH. Combined Experimental and Master Equation Investigation of the Multiwell Reaction H + SO2. J Phys Chem A 2006; 110:2996-3009. [PMID: 16509621 DOI: 10.1021/jp054722u] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The temperature and pressure dependence of the rate coefficient for the reaction H + SO2 has been measured using a laser flash photolysis/laser-induced fluorescence technique, for 295 <or= T/K <or= 423 and for 3 <or= [He]/10(18) molecules cm(-3) <or= 23. Under these conditions, the reaction occurs exclusively to form HSO2. These data have been fitted to, and used to refine, a master equation (ME) model of the H + SO2 reaction system that includes the isomers HSO2 and HOSO and the high-temperature products OH + SO. The potential energy for the system is based on literature ab initio calculations. The three eigenvalues of lowest magnitude, obtained from solution of the ME, are the chemically significant eigenvalues that are related to the pressure and temperature dependent rate coefficients for the chemical system. The eigenvalues are generally well separated from each other and from the eigenvalues relating to collisional relaxation, except at high temperatures. The rate coefficients were extracted from the eigenpairs of the ME solution, using an analysis developed by Klippenstein and Miller (J. Phys. Chem. A 2002, 106, 9267) and an adaptation of an earlier analysis by Bartis and Widom (J. Chem. Phys. 1974, 60, 3474). The relationship between the temperature dependence of the chemically significant eigenvalues and combinations of rate coefficients was elucidated via an approximate analysis of the chemical rate equations and it was demonstrated that each eigenvalue relates primarily to passage over a single transition state. Some problems were encountered in equating ratios of rate coefficients for forward and reverse reactions to the equilibrium constant. This problem arises from the nonconservative nature of the reaction system; it was resolved by imposing orthogonality on the coupled rate equations of the chemical system, giving good agreement between rate coefficient ratios and equilibrium constants. The temperature and pressure dependences of the rate coefficients were parametrized according to Troe and modified Troe expressions. The key processes, from a combustion perspective, are the formation and dissociation of HOSO and the formation of OH + SO. Except at pressures >10(3) atm, the latter proceeds directly from H + SO2, via the energized states of HOSO. The derived rate coefficients rely heavily on measurements of the reverse reaction, OH + SO, which has only been determined at temperatures up to 700 K.
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Affiliation(s)
- Mark A Blitz
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, U.K
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Daugey N, Caubet P, Retail B, Costes M, Bergeat A, Dorthe G. Kinetic measurements on methylidyne radical reactions with several hydrocarbons at low temperatures. Phys Chem Chem Phys 2005; 7:2921-7. [PMID: 16189612 DOI: 10.1039/b506096f] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The temperature dependences of the methylidyne radical reactions with methane, allene, methylacetylene and propene were studied. This work was carried out in a supersonic flow reactor coupled with pulsed laser photolysis (PLP) and laser-induced fluorescence (LIF) techniques. Three Laval nozzles were designed to provide uniform supersonic expansions of nitrogen at Mach 2 and of argon at Mach 2 and 3 to reach low temperatures, e.g. 170, 128 and 77 K, respectively. CH radicals were produced by PLP of CHBr3 at 266 nm and probed by LIF. The exponential decays of the CH fluorescence were acquired, hydrocarbons being introduced in excess. The rate constants for the CH+CH4 reaction are in good agreement with the temperature dependence proposed by Canosa et al. (A. Canosa, I. R. Sims, D. Travers, I. W. M. Smith and B. R. Rowe, Astron. Astrophys., 1997, 323, 644-651, ) i.e. 3.96x10(-8)(T/K)(-1.04) exp(-36.1 K/T) in the range 23-298 K. The rate constants of the CH+C3H4(allene), CH+C3H4(methylacetylene) and CH+C3H6(propene) reactions exhibit a small temperature dependence between 77 and 170 K, with a maximum rate around 100 K close to (4.3-4.6)x10(-10) cm3 molecule-1 s-1.
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Affiliation(s)
- Nicolas Daugey
- Laboratoire de Physico-Chimie Moléculaire, CNRS UMR5803, Université Bordeaux 1, F-33405, Talence Cedex, France
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Gravestock T, Blitz MA, Heard DE. Kinetics study of the reaction of iodine monoxide radicals with dimethyl sulfide. Phys Chem Chem Phys 2005; 7:2173-81. [DOI: 10.1039/b502989a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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McKee K, Blitz MA, Hughes KJ, Pilling MJ, Qian HB, Taylor A, Seakins PW. H Atom Branching Ratios from the Reactions of CH with C2H2, C2H4, C2H6, and neo-C5H12 at Room Temperature and 25 Torr. J Phys Chem A 2003. [DOI: 10.1021/jp021613w] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Kenneth McKee
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Mark A. Blitz
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Kevin J. Hughes
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | | | - Hai-Bo Qian
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Andrew Taylor
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Paul W. Seakins
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
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Blitz MA, McKee KW, Pilling MJ, Seakins PW. Evidence for the dominance of collision-induced intersystem crossing in collisions of 1CH2 with O2 and a determination of the H atom yields from 3CH2+O2, using time-resolved detection of H formation by vuvLIF. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00393-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Blitz MA, Hughes KJ, Pilling MJ. Determination of the High-Pressure Limiting Rate Coefficient and the Enthalpy of Reaction for OH + SO2. J Phys Chem A 2003. [DOI: 10.1021/jp026524y] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mark A. Blitz
- Department of Chemistry, University of Leeds, Leeds, U.K. LS2 9JT
| | - Kevin J. Hughes
- Department of Chemistry, University of Leeds, Leeds, U.K. LS2 9JT
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Blitz MA, McKee KW, Pilling MJ, Vincent MA, Hillier IH. Experimental Rate Measurements for NS + NO, O2 and NO2, and Electronic Structure Calculations of the Reaction Paths for NS + NO2. J Phys Chem A 2002. [DOI: 10.1021/jp025508y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Reaction of methylidyne radical with CH4 and H2S: overall rate constant and absolute atomic hydrogen production. Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00443-3] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Taatjes CA, Klippenstein SJ. Kinetic Isotope Effects and Variable Reaction Coordinates in Barrierless Recombination Reactions. J Phys Chem A 2001. [DOI: 10.1021/jp011632q] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Craig A. Taatjes
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969
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Thiesemann H, Clifford EP, Taatjes CA, Klippenstein SJ. Temperature Dependence and Deuterium Kinetic Isotope Effects in the CH (CD) + C2H4 (C2D4) Reaction between 295 and 726 K. J Phys Chem A 2001. [DOI: 10.1021/jp0045641] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Holger Thiesemann
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969
| | - Eileen P. Clifford
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969
| | - Craig A. Taatjes
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969
| | - Stephen J. Klippenstein
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, California 94551-0969
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Blitz M, Pesa M, Pilling M, Seakins P. Vibrational relaxation of the CH(D)(X2Π, v=1,2) radical by helium and argon: evidence for a curve crossing mechanism. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00409-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Blitz MA, Pesa M, Pilling MJ, Seakins PW. Reaction of CH with H2O: Temperature Dependence and Isotope Effect. J Phys Chem A 1999. [DOI: 10.1021/jp9903716] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Mark A. Blitz
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Michèle Pesa
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | | | - Paul W. Seakins
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
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Sato K, Wakabayashi S, Matsubara T, Sugiura M, Tsunashima S, Kurosaki Y, Takayanagi T. Kinetics and mechanisms of the reactions of CH and CD with H2S and D2S. Chem Phys 1999. [DOI: 10.1016/s0301-0104(98)00420-0] [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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