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  Kinetics of the OH + NO2 reaction: rate coefficients (217-333 K, 16-1200 mbar) and fall-off parameters for N2 and O2 bath gases

Amedro, D., Bunkan, A. J. C., Berasategui, M., & Crowley, J. N. (2019). Kinetics of the OH + NO2 reaction: rate coefficients (217-333 K, 16-1200 mbar) and fall-off parameters for N2 and O2 bath gases. Atmospheric Chemistry and Physics, 19(16), 10643-10657. doi:10.5194/acp-19-10643-2019.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-CD3D-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-CD3E-1
Genre: Journal Article

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 Creators:
Amedro, Damien1, Author              
Bunkan, Arne J. C.1, Author              
Berasategui, Matias1, Author              
Crowley, John N.1, Author              
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: The radical terminating, termolecular reaction between OH and NO2 exerts great influence on the NOy∕NOx ratio and O3 formation in the atmosphere. Evaluation panels (IUPAC and NASA) recommend rate coefficients for this reaction that disagree by as much as a factor of 1.6 at low temperature and pressure. In this work, the title reaction was studied by pulsed laser photolysis and laser-induced fluorescence over the pressure range 16–1200 mbar and temperature range 217–333 K in N2 bath gas, with experiments at 295 K (67–333 mbar) for O2. In situ measurement of NO2 using two optical absorption set-ups enabled generation of highly precise, accurate rate coefficients in the fall-off pressure range, appropriate for atmospheric conditions. We found, in agreement with previous work, that O2 bath gas has a lower collision efficiency than N2 with a relative collision efficiency to N2 of 0.74. Using the Troe-type formulation for termolecular reactions we present a new set of parameters with k0(N2) = 2.6×10−30  cm6 molecule−2 s−1, k0(O2) = 2.0×10−30 cm6 molecule−2 s−1, m=3.6, k∞=6.3×10−11 cm3 molecule−1 s−1, and Fc=0.39 and compare our results to previous studies in N2 and O2 bath gases.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000482569200001
DOI: 10.5194/acp-19-10643-2019
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Title: Atmospheric Chemistry and Physics
  Abbreviation : ACP
Source Genre: Journal
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Publ. Info: Göttingen : Copernicus Publications
Pages: - Volume / Issue: 19 (16) Sequence Number: - Start / End Page: 10643 - 10657 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016