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| Titel |
Kinetic and product studies of Criegee intermediate reactions with halogenated and non-halogenated carboxylic acids and their implications in the troposphere |
| VerfasserIn |
Rabi Chhantyal-Pun, Brandon Rotavera, Arkke Eskola, Craig Taatjes, Carl Percival, Dudley Shallcross, Andrew Orr-Ewing |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126591
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| Publikation (Nr.) |
 EGU/EGU2016-6334.pdf |
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| Zusammenfassung |
| Criegee intermediates are important species formed during the ozonolysis of alkenes. Direct
measurement and modelling studies have shown that reactions of stabilized Criegee
intermediates with species like SO2 and NO2 may have a significant effect in tropospheric
chemistry.[1, 2] Reaction rates of Criegee intermediates with simple carboxylic acids like
HCOOH and CH3COOH have been shown to be near the collision limit and may be a
significant sink for these otherwise stable species in the atmosphere.[3, 4] Results obtained
from our time-resolved Cavity Ring-Down Spectroscopy (CRDS) apparatus[5] for reactions
of the Criegee intermediates, CH2OO and (CH3)2COO with various halogenated
(CF3COOH, CF3CF2COOH, CClF2COOH and CHCl2COOH) and non-halogenated
(HCOOH and CH3COOH) carboxylic acids will be presented, together with Structure
Activity Relationship (SAR) based on these observations. Structure characterization of the
products from these reactions using the Multiplexed PhotoIonization Mass Spectrometry
(MPIMS) apparatus[1,3] as well as implications for Secondary Organic Aerosol (SOA)
formation, assessed using the global atmospheric model STOCHEM, will also be
discussed.
Bibliography
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