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Lu B, Song C, Liu J, Trabelsi T, Francisco JS, Wang L, Zeng X. Dihalogenated Methylperoxy Radicals: Spectroscopic Characterization and Photodecomposition by Release of HO .. Chemistry 2020; 26:2817-2820. [PMID: 31899574 DOI: 10.1002/chem.201905858] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Indexed: 11/08/2022]
Abstract
Two atmospherically relevant dihalogenated methylperoxy radicals CHX2 OO. (X=F and Cl) have been generated through O2 -oxidation of the corresponding alkyl radicals CHX2 . in the gas phase. The IR spectroscopic characterization of both radicals in cryogenic Ar- and N2 -matrices (15 K) is supported by 18 O-labeling and ab initio calculations at the UCCSD(T)/aug-cc-pVTZ level. Upon 266 nm laser irradiation, both radicals decompose mainly by releasing hydroxyl radicals (→HO. +X2 CO) via the intermediacy of intriguing α-hydroperoxyalkyl radicals (. CX2 OOH), implying that the photooxidation of dihalogenated hydrocarbons might serve as important sources of HO. radicals in the atmosphere.
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Affiliation(s)
- Bo Lu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Chao Song
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Jie Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China
| | - Tarek Trabelsi
- Department of Earth and Environmental Science and Department of, Chemistry, University of Pennsylvania, Pennsylvania, 19104, USA
| | - Joseph S Francisco
- Department of Earth and Environmental Science and Department of, Chemistry, University of Pennsylvania, Pennsylvania, 19104, USA
| | - Lina Wang
- Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
| | - Xiaoqing Zeng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.,Department of Chemistry, Fudan University, Shanghai, 200433, P. R. China
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Østerstrøm FF, Andersen C, da Silva G. Mechanistic study of the reaction of CH 2F 2 with Cl atoms in the absence and presence of CH 4 or C 2H 6: decomposition of CHF 2OH and fate of the CHF 2O radical. Phys Chem Chem Phys 2019; 21:9376-9383. [PMID: 30994634 DOI: 10.1039/c8cp06425c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To assess the atmospheric fate of fluorinated compounds, chamber experiments were performed with Fourier transform infrared spectroscopy investigating the products of difluoromethane, CH2F2, at 296 ± 2 K. The reactions were initiated by reaction of CH2F2 with Cl atoms in the absence and presence of CH4 or C2H6 in air or O2. No evidence of formation of the fluorinated alcohol, CHF2OH, from the reactions of the CHF2O2 radical with either CH3O2 or CH3CH2O2 was observed. However, evidence of an alkoxy radical pathway was observed to form CHF2OH. The alkoxy radical, CHF2O, abstracts a hydrogen atom from CH2F2 (with reaction mixtures of high initial CH2F2 concentrations) to give the alcohol CHF2OH that in turn decomposes with a rate coefficient of k(CHF2OH) = (1.68 × 10-3 ± 0.19 × 10-3) s-1, giving a half-life of the alcohol of (412 ± 48) s. Theoretical calculations indicate that the CHF2OH decomposition is unlikely to be a unimolecular process, and we instead propose that it is catalyzed by -OH groups present in molecules, or on particles or surfaces. HC(O)F is formed in a yield indistinguishable from 100% from the decomposition of CHF2OH. The competition between the reaction of CHF2O radicals with O2 and with CH2F2 was investigated and an experimental rate coefficient ratio of 0.57 ± 0.08 of reaction with O2 over reaction with CH2F2 was determined. Ab initio calculations support a larger reaction barrier for the O2 reaction by 0.5 kcal mol-1, with transition state theory predicting a rate coefficient ratio of 0.35, in reasonable agreement with experiment. The primary product of the atmospheric degradation of CH2F2 is expected to be C(O)F2 formed by the reaction of CHF2O with O2.
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Affiliation(s)
- Freja F Østerstrøm
- Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
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Intramolecular hydrogen-bonding effects on O H stretch overtone excitation for fluorinated hydroperoxides. Chem Phys 2017. [DOI: 10.1016/j.chemphys.2017.03.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Østerstrøm FF, Wallington TJ, Sulbaek Andersen MP, Nielsen OJ. Atmospheric Chemistry of (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3. J Phys Chem A 2015; 119:10540-52. [PMID: 26439469 DOI: 10.1021/acs.jpca.5b08204] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Smog chambers with in situ FTIR detection were used to measure rate coefficients in 700 Torr of air and 296 ± 2 K of: k(Cl+(CF3)2CHOCH3) = (5.41 ± 1.63) × 10(-12), k(Cl+(CF3)2CHOCHO) = (9.44 ± 1.81) × 10(-15), k(Cl+CF3C(O)OCH3) = (6.28 ± 0.98) × 10(-14), k(OH+(CF3)2CHOCH3) = (1.86 ± 0.41) × 10(-13), and k(OH+(CF3)2CHOCHO) = (2.08 ± 0.63) × 10(-14) cm(3) molecule(-1) s(-1). The Cl atom initiated oxidation of (CF3)2CHOCH3 gives (CF3)2CHOCHO in a yield indistinguishable from 100%. The OH radical initiated oxidation of (CF3)2CHOCH3 gives the following products (molar yields): (CF3)2CHOCHO (76 ± 8)%, CF3C(O)OCH3 (16 ± 2)%, CF3C(O)CF3 (4 ± 1)%, and C(O)F2 (45 ± 5)%. The primary oxidation product (CF3)2CHOCHO reacts with Cl atoms to give secondary products (molar yields): CF3C(O)CF3 (67 ± 7)%, CF3C(O)OCHO (28 ± 3)%, and C(O)F2 (118 ± 12)%. CF3C(O)OCH3 reacts with Cl atoms to give: CF3C(O)OCHO (80 ± 8)% and C(O)F2 (6 ± 1)%. Atmospheric lifetimes of (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3 were estimated to be 62 days, 1.5 years, and 220 days, respectively. The 100-year global warming potentials (GWPs) for (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3 are estimated to be 6, 121, and 46, respectively. A comprehensive description of the atmospheric fate of (CF3)2CHOCH3 is presented.
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Affiliation(s)
- Freja From Østerstrøm
- Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Timothy J Wallington
- Research and Advanced Engineering, Ford Motor Company , Dearborn, Michigan 48121-2053, United States
| | - Mads P Sulbaek Andersen
- Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark.,Department of Chemistry and Biochemistry, California State University , Northridge, California 91330, United States
| | - Ole John Nielsen
- Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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Poutsma ML. Evolution of Structure–Reactivity Correlations for the Hydrogen Abstraction Reaction by Chlorine Atom. J Phys Chem A 2013; 117:687-703. [DOI: 10.1021/jp310970t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Marvin L. Poutsma
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee
37831-6197, United States
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Orlando JJ, Tyndall GS. Laboratory studies of organic peroxy radical chemistry: an overview with emphasis on recent issues of atmospheric significance. Chem Soc Rev 2012; 41:6294-317. [PMID: 22847633 DOI: 10.1039/c2cs35166h] [Citation(s) in RCA: 244] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- John J Orlando
- National Center for Atmospheric Research, Earth System Laboratory, Atmospheric Chemistry Division, Boulder, USA.
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Sarzyński D, Gola AA, Brudnik K, Jodkowski JT. Kinetic study of the reaction of chlorine atoms with dichloromethane and D-dichloromethane in the gas phase. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.08.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Nilsson EJK, Johnson MS, Nielsen OJ, Kaiser EW, Wallington TJ. Kinetics of the gas-phase reactions of chlorine atoms with CH2F2, CH3CCl3, and CF3CFH2over the temperature range 253-553 K. INT J CHEM KINET 2009. [DOI: 10.1002/kin.20398] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Ab initio direct dynamics studies on the hydrogen abstraction reactions of CF2H2 and CF3H with F atom. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.04.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Wallington TJ, Mabury SA, Hurley MD, Sulbaek Andersen MP, Nielsen OJ, Ellis DA, Martin JW. Comment on “Atmospheric Chemistry of Linear Perfluorinated Aldehydes: Dissociation Kinetics of CnF2n+1CO Radicals”. J Phys Chem A 2008; 112:576-7; discussion 577-8. [DOI: 10.1021/jp074587g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- T. J. Wallington
- Ford Motor Company, RIC 2122, Dearborn, Michigan, 48121−2053, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada, Department of Chemistry, University of California, 572 Rowland Hall, Irvine, California 92697-2025, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada, and Division of Analytical and
| | - S. A. Mabury
- Ford Motor Company, RIC 2122, Dearborn, Michigan, 48121−2053, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada, Department of Chemistry, University of California, 572 Rowland Hall, Irvine, California 92697-2025, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada, and Division of Analytical and
| | - M. D. Hurley
- Ford Motor Company, RIC 2122, Dearborn, Michigan, 48121−2053, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada, Department of Chemistry, University of California, 572 Rowland Hall, Irvine, California 92697-2025, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada, and Division of Analytical and
| | - M. P. Sulbaek Andersen
- Ford Motor Company, RIC 2122, Dearborn, Michigan, 48121−2053, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada, Department of Chemistry, University of California, 572 Rowland Hall, Irvine, California 92697-2025, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada, and Division of Analytical and
| | - O. J. Nielsen
- Ford Motor Company, RIC 2122, Dearborn, Michigan, 48121−2053, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada, Department of Chemistry, University of California, 572 Rowland Hall, Irvine, California 92697-2025, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada, and Division of Analytical and
| | - D. A. Ellis
- Ford Motor Company, RIC 2122, Dearborn, Michigan, 48121−2053, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada, Department of Chemistry, University of California, 572 Rowland Hall, Irvine, California 92697-2025, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada, and Division of Analytical and
| | - J. W. Martin
- Ford Motor Company, RIC 2122, Dearborn, Michigan, 48121−2053, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON M5S 3H6, Canada, Department of Chemistry, University of California, 572 Rowland Hall, Irvine, California 92697-2025, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark, Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada, and Division of Analytical and
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Waterland RL, Dobbs KD. Reply to “Comment on ‘Atmospheric Chemistry of Linear Perfluorinated Aldehydes: Dissociation Kinetics of C nF 2n+1CO Radicals'”. J Phys Chem A 2008. [DOI: 10.1021/jp075291d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert L. Waterland
- DuPont Central Research & Development, Experimental Station, P. O. Box 80320, Wilmington, Delaware 19880-0320
| | - Kerwin D. Dobbs
- DuPont Central Research & Development, Experimental Station, P. O. Box 80320, Wilmington, Delaware 19880-0320
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Waterland RL, Dobbs KD. Atmospheric Chemistry of Linear Perfluorinated Aldehydes: Dissociation Kinetics of CnF2n+1CO Radicals. J Phys Chem A 2007; 111:2555-62. [PMID: 17388359 DOI: 10.1021/jp067587+] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Linear perfluorinated aldehydes (PFALs, CnF2n+1CHO) are important intermediate species in the atmospheric oxidation pathway of many polyfluorinated compounds. PFALs can be further oxidized in the gas phase to give perfluorinated carboxylic acids (PFCAs, CnF2n+1C(O)OH, n = 6, 12) which have been detected in animal tissues and at low parts per billion levels in human blood sera. In this paper, we report ab initio quantum chemistry calculations of the decarbonylation kinetics of CnF2n+1CO radicals. Our results show that CnF2n+1CO radicals have a strong tendency to decompose to give CnF2n+1 and CO under atmospheric conditions: the Arrhenius activation energies for decarbonylation of CF3CO, C2F5CO, and C3F7CO obtained using PMP4/6-311++G(2d,p) are 8.8, 6.6, and 5.8 kcal/mol, respectively, each of which is about 5 kcal/mol lower than the barrier for the corresponding nonfluorinated radicals. The lowering of the barrier for decarbonylation of CnF2n+1CO relative to that of CnH2n+1CO is well explained by electron withdrawal by F atoms that serve to weaken the critical C-CO bond. These results have important implications for the atmospheric fate of PFALs and the atmospheric pathways to PFCAs. The main effect of decarbonylation of CnF2n+1CO is to decrease the molar yield of CnF2n+1C(O)OH; if 100% of the CnF2n+1CO decompose, the yield of CnF2n+1C(O)OH must be zero. There is considerable scope for additional experimental and theoretical studies.
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Affiliation(s)
- Robert L Waterland
- DuPont Central Research & Development, Experimental Station, P. O. Box 80320, Wilmington, Delaware 19880-0320, USA.
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Wallington TJ, Hurley MD, Shi J, Maricq MM, Sehested J, Nielsen OJ, Ellermann T. A kinetic study of the reaction of fluorine atoms with CH3F, CH3Cl, CH3Br, CF2H2, CO, CF3H, CF3CHCl2, CF3CH2F, CHF2CHF2, CF2ClCH3, CHF2CH3, and CF3CF2H at 295 ± 2 K. INT J CHEM KINET 2004. [DOI: 10.1002/kin.550250806] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Knyazev VD. Isodesmic Reactions for Transition States: Reactions of Cl Atoms with Methane and Halogenated Methanes. J Phys Chem A 2003. [DOI: 10.1021/jp036281p] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vadim D. Knyazev
- Research Center for Chemical Kinetics, Department of Chemistry, The Catholic University of America, Washington, D.C. 20064, and Physical and Chemical Properties Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Beiderhase T, Hack W, Hoyermann K, Olzmann M. Gas-Phase Kinetics of the Self Reactions of the Radicals CH2F and CHF2. Z PHYS CHEM 2000. [DOI: 10.1524/zpch.2000.214.5.625] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Fluorinated hydrocarbon radical-radical reactions in the gas phase have been studied at low pressure (0.5 ≤ p/mbar ≤ 2) and low temperature (253 ≤ T/K ≤ 333) using the discharge flow reactor molecular beam sampling mass spectrometry (MS) technique. Stable and labile species have been detected by MS applying low energy electron impact as well as multiphoton ionisation.For the combination reactionCHthe rate coefficient kCHis the main channel (k(1b)/kFor the CHFCHFthe rate coefficient was measured as kNo pressure dependence of k
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Bilde M, Sehested J, Møgelberg TE, Wallington TJ, Nielsen OJ. Atmospheric Chemistry of CF2BrH: Kinetics and Mechanism of Reaction with F and Cl Atoms and Fate of CF2BrO Radicals. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9530111] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Merete Bilde
- Section for Chemical Reactivity, Environmental Science and Technology Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
| | - Jens Sehested
- Section for Chemical Reactivity, Environmental Science and Technology Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
| | - Trine E. Møgelberg
- Section for Chemical Reactivity, Environmental Science and Technology Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
| | - Timothy J. Wallington
- Ford Motor Company, Ford Research Laboratory, SRL-3083, P.O. Box 2053, Dearborn, Michigan 48121-2053
| | - Ole J. Nielsen
- Ford Motor Company, Ford Forschungszentrum Aachen, Dennewartstrasse 25, D-52068 Aachen, Germany
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Wallington TJ, Sehested J, Nielsen OJ. Atmospheric chemistry of CF3C(O)O2 radicals. Kinetics of their reaction with NO2 and kinetics of the thermal decomposition of the product CF3C(O)O2NO2. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)00751-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kinetics of the reaction of F atoms with O2 and UV spectrum of FO2 radicals in the gas phase at 295 K. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)00006-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sehested J, Ellermann T, Nielsen OJ, Wallington TJ, Hurley MD. UV absorption spectrum, and kinetics and mechanism of the self reaction of CF3CF2O2 radicals in the gas phase at 295 K. INT J CHEM KINET 1993. [DOI: 10.1002/kin.550250903] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Nielsen OJ, Ellermann T, Sehested J, Bartkiewicz E, Wallington TJ, Hurley MD. UV absorption spectra, kinetics, and mechanisms of the self reaction of CF3O2 radicals in the gas phase at 295 K. INT J CHEM KINET 1992. [DOI: 10.1002/kin.550241111] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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