Products of Criegee intermediate reactions with NO2: experimental measurements and tropospheric implications. (12th June 2017)

• Record Type: Journal Article
• Authors: Caravan, Rebecca L.; Khan, M. Anwar H.; Rotavera, Brandon; Papajak, Ewa; Antonov, Ivan O.; Chen, Ming-Wei; Au, Kendrew; Chao, Wen; Osborn, David L.; Lin, Jim Jr-Min; Percival, Carl J.; Shallcross, Dudley E.; Taatjes, Craig A.
• Is Part Of: Faraday discussions. Volume 200(2017)
• Page Start: 313
• Page End: 330
• Publication Date: 2017-06-12
• Subjects: Chemistry -- Periodicals; Metallurgy -- Periodicals; Electrochemistry -- Periodicals; 540
• DOI: 10.1039/c7fd00007c
• Languages: English
• ISSNs: 1359-6640

Abstract

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 NO x 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 (CH2 OO) and acetaldehyde oxide (CH3 CHOO) 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.