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Onel L, Brennan A, Østerstro M FF, Cooke E, Whalley L, Seakins PW, Heard DE. Kinetics and Product Branching Ratio Study of the CH 3O 2 Self-Reaction in the Highly Instrumented Reactor for Atmospheric Chemistry. J Phys Chem A 2022; 126:7639-7649. [PMID: 36227778 PMCID: PMC9620170 DOI: 10.1021/acs.jpca.2c04968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
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The fluorescence assay by gas expansion (FAGE) method
for the measurement
of the methyl peroxy radical (CH3O2) using the
conversion of CH3O2 into methoxy radicals (CH3O) by excess NO, followed by the detection of CH3O, has been used to study the kinetics of the self-reaction of CH3O2. Fourier transform infrared (FTIR) spectroscopy
has been employed to determine the products methanol and formaldehyde
of the self-reaction. The kinetics and product studies were performed
in the Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)
in the temperature range 268–344 K at 1000 mbar of air. The
product measurements were used to determine the branching ratio of
the reaction channel forming methoxy radicals, rCH3O. A value of 0.34 ± 0.05 (errors at 2σ level)
was determined for rCH3O at 295 K. The
temperature dependence of rCH3O can be
parametrized as rCH3O = 1/{1 + [exp(600
± 85)/T]/(3.9 ± 1.1)}. An overall rate
coefficient of the self-reaction of (2.0 ± 0.9) × 10–13 cm3 molecule–1 s–1 at 295 K was obtained by the kinetic analysis of
the observed second-order decays of CH3O2. The
temperature dependence of the overall rate coefficient can be characterized
by koverall = (9.1 ± 5.3) ×
10–14 × exp((252 ± 174)/T) cm3 molecule–1 s–1. The found values of koverall in the
range 268–344 K are ∼40% lower than the values calculated
using the recommendations of the Jet Propulsion Laboratory and IUPAC,
which are based on the previous studies, all of them utilizing time-resolved
UV–absorption spectroscopy to monitor CH3O2. A modeling study using a complex chemical mechanism to describe
the reaction system showed that unaccounted secondary chemistry involving
Cl species increased the values of koverall in the previous studies using flash photolysis to initiate the chemistry.
The overestimation of the koverall values
by the kinetic studies using molecular modulation to generate CH3O2 can be rationalized by a combination of underestimated
optical absorbance of CH3O2 and unaccounted
CH3O2 losses to the walls of the reaction cells
employed.
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Affiliation(s)
- Lavinia Onel
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Alexander Brennan
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | | | - Ellie Cooke
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Lisa Whalley
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom.,National Centre for Atmospheric Science, University of Leeds, LS2 9JT, United Kingdom
| | - Paul W Seakins
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Dwayne E Heard
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
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2
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Zhang Y, Bing H, Song R. Mechanistic and kinetic study on the reaction of the·Cl‐initiated atmospheric degradation of CFCl
2
O
2. J PHYS ORG CHEM 2021. [DOI: 10.1002/poc.4130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - He Bing
- College of Chemistry and Life Science, Sichuan Provincial Key Laboratory for Structural Optimization and Application of Functional Molecules Chengdu Normal University Chengdu China
| | - Ruojing Song
- Key Laboratory of Photoinduced Functional Materials Mianyang Normal University Mianyang China
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Mull HF, Aroeira GJR, Turney JM, Schaefer HF. The atmospheric importance of methylamine additions to Criegee intermediates. Phys Chem Chem Phys 2020; 22:22555-22566. [DOI: 10.1039/d0cp03781h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The methylamine addition to Criegee intermediates is investigated using high level ab initio methods.
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Affiliation(s)
- Henry F. Mull
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | | | - Justin M. Turney
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry
- University of Georgia
- Athens
- USA
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Khan MAH, Percival CJ, Caravan RL, Taatjes CA, Shallcross DE. Criegee intermediates and their impacts on the troposphere. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2018; 20:437-453. [PMID: 29480909 DOI: 10.1039/c7em00585g] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Criegee intermediates (CIs), carbonyl oxides formed in ozonolysis of alkenes, play key roles in the troposphere. The decomposition of CIs can be a significant source of OH to the tropospheric oxidation cycle especially during nighttime and winter months. A variety of model-measurement studies have estimated surface-level stabilized Criegee intermediate (sCI) concentrations on the order of 1 × 104 cm-3 to 1 × 105 cm-3, which makes a non-negligible contribution to the oxidising capacity in the terrestrial boundary layer. The reactions of sCI with the water monomer and the water dimer have been found to be the most important bimolecular reactions to the tropospheric sCI loss rate, at least for the smallest carbonyl oxides; the products from these reactions (e.g. hydroxymethyl hydroperoxide, HMHP) are also of importance to the atmospheric oxidation cycle. The sCI can oxidise SO2 to form SO3, which can go on to form a significant amount of H2SO4 which is a key atmospheric nucleation species and therefore vital to the formation of clouds. The sCI can also react with carboxylic acids, carbonyl compounds, alcohols, peroxy radicals and hydroperoxides, and the products of these reactions are likely to be highly oxygenated species, with low vapour pressures, that can lead to nucleation and SOA formation over terrestrial regions.
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Affiliation(s)
- M A H Khan
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
| | - C J Percival
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, Pasadena, CA 91109, USA
| | - R L Caravan
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California, 94551 USA
| | - C A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California, 94551 USA
| | - D E Shallcross
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
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5
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Kukui A, Jungkamp T, Schindler R. Aldehyde Formation in the Reaction of Methoxy Radicals with NO3. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.199500126] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Xiang T, Si H. A computational investigation of product channels in the CH3O2+F reaction. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2013.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Kirchner U, Benter TH, Schindler RN. Experimental verification of gas phase bromine enrichment in reactions of HOBr with sea salt doped ice surfaces. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19971010614] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kukui A, Roggenbuck J, Schindler RN. Mechanism and rate constants for the reactions of Cl atoms with HOCl, CH3OCl and tert-C4H9OCl. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19971010217] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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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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Drougas E, Kosmas A. Quantum mechanical studies on the potential energy surface of the reactions CH3+OClO, CH3O+ClO and CH3O2+Cl. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(02)01981-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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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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Tyndall GS, Cox RA, Granier C, Lesclaux R, Moortgat GK, Pilling MJ, Ravishankara AR, Wallington TJ. Atmospheric chemistry of small organic peroxy radicals. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jd900746] [Citation(s) in RCA: 287] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schalley CA, Schröder D, Schwarz H. A neutralization-reionization mass spectrometric study of alkyl hydroperoxide cation radicals and four distinguishable [C,H3,O2]+ isomers. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0168-1176(96)04360-1] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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