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Products of Criegee intermediate reactions with NO2: experimental measurements and tropospheric implications

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Abstract

The reactions of Criegee intermediates with NO2 have been proposed as a potentially significant source of the important nighttime oxidant NO3, particularly in urban environments where concentrations of ozone, alkenes and NOx are high. However, previous efforts to characterize the yield of NO3 from these reactions have been inconclusive, with many studies failing to detect NO3. In the present work, the reactions of formaldehyde oxide (CH2OO) and acetaldehyde oxide (CH3CHOO) with NO2 are revisited to further explore the product formation over a pressure range of 4–40 Torr. NO3 is not observed; however, temporally resolved and [NO2]-dependent signal is observed at the mass of the Criegee–NO2 adduct for both formaldehyde- and acetaldehyde-oxide systems, and the structure of this adduct is explored through ab initio calculations. The atmospheric implications of the title reaction are investigated through global modelling.

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Publication details

The article was received on 06 Jan 2017, accepted on 25 Jan 2017 and first published on 12 Jun 2017


Article type: Paper
DOI: 10.1039/C7FD00007C
Citation: Faraday Discuss., 2017, Advance Article
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    Products of Criegee intermediate reactions with NO2: experimental measurements and tropospheric implications

    R. L. Caravan, M. A. H. Khan, B. Rotavera, E. Papajak, I. O. Antonov, M. Chen, K. Au, W. Chao, D. L. Osborn, J. J. Lin, C. J. Percival, D. E. Shallcross and C. A. Taatjes, Faraday Discuss., 2017, Advance Article , DOI: 10.1039/C7FD00007C

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