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

R. L. Caravan, Anwar Khan, Brandon Rotavera, Ewa Papajak, Ivan O Antonov, Ming-Wei Chen, Kendrew Au, Wen Chao, David L Osborn, Jim Jr-Min Lin, Carl J Percival, Dudley Shallcross, C. A. Taatjes

Research output: Contribution to journalArticle (Academic Journal)peer-review

25 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)313-330
Number of pages18
JournalFaraday Discussions
Volume200
Early online date12 Jun 2017
DOIs
Publication statusPublished - 1 Aug 2017

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