Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 14, Issue 42, Pages 14682-14695Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp42300f
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Funding
- Max Planck Graduate Center Mainz (MPGC-Mainz)
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The reaction of Criegee intermediates (CI) with NO and RO2 radicals is studied for the first time by theoretical methodologies; additionally, the reaction of CI with SO2 molecules is re-examined. The reaction of CI with NO was found to be slow, with a distinct energy barrier. Their reaction with RO2 radicals proceeds by the formation of a pre-reactive complex followed by addition of the RO2 radical on the CI carbon over a submerged barrier, leading to a larger peroxy radical and opening the possibility for oligomer formation in agreement with experiment. The impact of singlet biradicals on the reaction of CI with SO2 is examined, finding a different reaction mechanism compared to earlier work. For larger CI, the reaction with SO2 at atmospheric pressures mainly yields thermalized sulfur-bearing secondary ozonides. The fate of the CI in the atmosphere is examined in detail, based on observed concentration of a multitude of coreactants in the atmosphere, and estimated rate coefficients available from literature data. The impact of SCI on tropospheric chemistry is discussed.
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