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Ward MKM, Rowley DM. Kinetics of the ClO + CH3O2 reaction over the temperature range T = 250-298 K. Phys Chem Chem Phys 2016; 18:13646-56. [PMID: 27137440 DOI: 10.1039/c6cp00724d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The kinetics of the potentially atmospherically important ClO + CH3O2 reaction (1) have been studied over the range T = 250-298 K at p = 760 Torr using laser flash photolysis radical generation, coupled with time resolved ultraviolet absorption spectroscopy, employing broad spectral monitoring using a charge coupled device detector array. ClO radicals were monitored unequivocally using this technique, and introduction of CH3O2 precursors ensured known initial methylperoxy radical concentrations. ClO temporal profiles were thereafter analysed to extract kinetic parameters for reaction (1). A detailed sensitivity analysis was also performed to examine any potential systematic variability in k1 as a function of kinetic or physical uncertainties. The kinetic data recorded in this work show good agreement with the most recent previous study of this reaction, reported by Leather et al. The current work reports an Arrhenius parameterisation for k1, given by: . This work therefore concurs with that of Leather et al. implying that the title reaction is potentially less significant in the atmosphere than inferred from preceding studies. However, reaction (1) is evidently a non-terminating radical reaction, whose effects upon atmospheric composition therefore need to be ascertained through atmospheric model studies.
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Affiliation(s)
- Michael K M Ward
- Department of Chemistry, UCL, 20 Gordon Street, London WC1H 0AJ, UK.
| | - David M Rowley
- Laboratoire PC2A/CNRS, Université de Lille 1, 59655, Villeneuve d'Ascq, France
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2
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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: 238] [Impact Index Per Article: 19.8] [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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Leather KE, Bacak A, Wamsley R, Archibald AT, Husk A, Shallcross DE, Percival CJ. Temperature and pressure dependence of the rate coefficient for the reaction between ClO and CH3O2 in the gas-phase. Phys Chem Chem Phys 2012; 14:3425-34. [DOI: 10.1039/c2cp22834c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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4
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Kukui AS, Jungkamp TPW, Schindler RN. Determination of the rate constant and of product branching ratios in the reaction of CH3O2 with OCl between 233 and 300 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19940981013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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5
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6
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Song CF, Tian ZM, Lib QX, He TJ. Ab initioStudy of the Potential Energy Surface and Product Branching Ratios for Reaction of O(1D) with C2H5Cl. CHINESE J CHEM PHYS 2009. [DOI: 10.1088/1674-0068/22/01/87-96] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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7
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Drougas E, Kosmas AM. Ab Initio Characterization of (CH3IO3) Isomers and the CH3O2 + IO Reaction Pathways. J Phys Chem A 2007; 111:3402-8. [PMID: 17419596 DOI: 10.1021/jp068348p] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The geometries, harmonic vibrational frequencies, relative energetics, and enthalpies of formation of (CH(3)IO(3)) isomers and the reaction CH(3)O(2) + IO have been investigated using quantum mechanical methods. Optimization has been performed at the MP2 level of theory, using all electron and effective core potential, ECP, computational techniques. The relative energetics has been studied by single-point calculations at the CCSD(T) level. Methyl iodate, CH(3)OIO(2), is found to be the lowest-energy isomer showing particular stabilization. The two nascent association minima, CH(3)OOOI and CH(3)OOIO, show similar stabilities, and they are considerably higher located than CH(3)OIO(2). Interisomerization barriers have been determined, along with the transition states involved in various pathways of the reaction CH(3)O(2) + IO.
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Affiliation(s)
- Evangelos Drougas
- Division of Physical Chemistry, Department of Chemistry, University of Ioannina, Greece 45110
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8
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Brudnik K, Jodkowski JT, Nowek A, Leszczynski J. Kinetics of the formation reactions of trichloro- and tribromomethyl hypohalites and alcohols in the gas-phase: Theoretical study. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2006.12.079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2022]
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9
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Bale CSE, Canosa-Mas CE, Shallcross DE, Wayne RP. A discharge–flow study of the kinetics of the reactions of IO with CH3O2 and CF3O2. Phys Chem Chem Phys 2005; 7:2164-72. [DOI: 10.1039/b501903f] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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10
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Krisch MJ, McCunn LR, Takematsu K, Butler LJ, Blase FR, Shu J. Photodissociation of CH3OCl to CH3O + Cl at 248 nm. J Phys Chem A 2004. [DOI: 10.1021/jp0372082] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. J. Krisch
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - L. R. McCunn
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - K. Takematsu
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - L. J. Butler
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - F. R. Blase
- Haverford College, Department of Chemistry, Haverford, Pennsylvania 19041
| | - J. Shu
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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11
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Drougas E, Jalbout AF, Kosmas AM. Quantum Mechanical Studies of CH3ClO3 Isomers and the CH3O2+ClO Reaction Pathways. J Phys Chem A 2003. [DOI: 10.1021/jp030757n] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Evangelos Drougas
- Department of Chemistry, University of Ioannina, Greece 451 10, Department of Physics, Dillard University, New Orleans, Louisiana 70112, and Department of Chemistry, The University of New Orleans, New Orleans, Louisiana 70148
| | - Abraham F. Jalbout
- Department of Chemistry, University of Ioannina, Greece 451 10, Department of Physics, Dillard University, New Orleans, Louisiana 70112, and Department of Chemistry, The University of New Orleans, New Orleans, Louisiana 70148
| | - Agnie M. Kosmas
- Department of Chemistry, University of Ioannina, Greece 451 10, Department of Physics, Dillard University, New Orleans, Louisiana 70112, and Department of Chemistry, The University of New Orleans, New Orleans, Louisiana 70148
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12
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Bedjanian Y, Poulet G. Kinetics of Halogen Oxide Radicals in the Stratosphere. Chem Rev 2003; 103:4639-56. [PMID: 14664627 DOI: 10.1021/cr0205210] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Yuri Bedjanian
- Laboratoire de Combustion et Systèmes Réactifs, CNRS, 45071 Orléans Cedex 2, France.
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13
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14
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Drougas E, Papayannis D, Kosmas A. Quantum mechanical and RRKM studies of the reactions CH3+ClO→CH3O+Cl and CH3O+Cl→HCHO+HCl. Chem Phys 2002. [DOI: 10.1016/s0301-0104(01)00548-1] [Citation(s) in RCA: 3] [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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15
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He TJ, Chen DM, Liu FC, Sheng LS. The potential energy surface for the decomposition of CH3OCl. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)01307-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Fockenberg C, Saathoff H, Zellner R. A laser photolysis/LIF study of the rate constant for the reaction CF3O+O3→products. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(93)e1457-r] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Crowley JN, Helleis F, Müller R, Moortgat GK, Crutzen PJ, Orlando JJ. CH3OCI: UV/visible absorption cross sections, J values and atmospheric significance. ACTA ACUST UNITED AC 1994. [DOI: 10.1029/94jd01829] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Elliott S, Cicerone RJ, Turco RP, Drdla K, Tabazadeh A. Influence of the heterogeneous reaction HCl + HOCl on an ozone hole model with hydrocarbon additions. ACTA ACUST UNITED AC 1994. [DOI: 10.1029/93jd03089] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Lightfoot P, Cox R, Crowley J, Destriau M, Hayman G, Jenkin M, Moortgat G, Zabel F. Organic peroxy radicals: Kinetics, spectroscopy and tropospheric chemistry. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0960-1686(92)90423-i] [Citation(s) in RCA: 571] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Horowitz A, Schuster G, Moortgat GK. The chain mechanism of ozone destruction by CFCl3 in the 214 nm photolysis of its mixtures with oxygen. INT J CHEM KINET 1992. [DOI: 10.1002/kin.550240304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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21
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DeMore WB. Tests of stratospheric models: The reactions of atomic chlorine with O3and CH4at low temperature. ACTA ACUST UNITED AC 1991. [DOI: 10.1029/90jd02737] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Sander SP, Friedl RR, Yung YL. Rate of formation of the ClO dimer in the polar stratosphere: implications for ozone loss. Science 1989; 245:1095-8. [PMID: 11538343 DOI: 10.1126/science.245.4922.1095] [Citation(s) in RCA: 136] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The gas-phase recombination of chlorine monoxide (ClO) has been investigated under the conditions of pressure and temperature that prevail in the Antarctic stratosphere during the period of maximum ozone (O3) disappearance. Measured rate constants are less than one-half as great as the previously accepted values. One-dimensional model calculations based on the new rate data indicate that currently accepted chemical mechanisms can quantitatively account for the observed O3 losses in late spring (17 September to 7 October). A qualitative assessment indicates that the existing mechanisms can only account for at most one-half of the measured O3 depletion in the early spring (28 August to 17 September), indicating that there may be additional catalytic cycles, besides those currently recognized, that destroy O3.
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Affiliation(s)
- S P Sander
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91109, USA
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