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SUMMARY:Laboratory Studies of Criegee Intermediate Reactions - Rabi Chhant
 yal Pun\, Bristol University
DTSTART:20160620T131500Z
DTEND:20160620T141500Z
UID:TALK65026@talks.cam.ac.uk
CONTACT:Paul Griffiths
DESCRIPTION:Criegee intermediates are important species formed during the 
 ozonolysis of alkenes. Recent direct measurement studies have shown that r
 eactions of stabilized Criegee intermediates with various species like SO2
 \, NO2 and carboxylic acids may have a significant effect in tropospheric 
 chemistry. The simplest and the most abundant Criegee intermediate\, CH2OO
 \, is expected to react mainly with (H2O)2 in the atmosphere. However stru
 ctured Criegee intermediates like (CH3)2COO react slowly with H2O/(H2O)2 a
 nd are expected to react with other trace atmospheric species. Results obt
 ained from our time-resolved Cavity Ring-Down Spectroscopy apparatus for r
 eactions of the Criegee intermediates\, CH2OO and (CH3)2COO with SO2 and c
 arboxylic acids with various degree of halogenation (HCOOH\, CH3COOH\, CF3
 COOH\, CF3CF2COOH\, CClF2COOH and CHCl2COOH) will be presented\, together 
 with a Structure Activity Relationship based on these observations. Struct
 ure characterization of the products from these reactions using the Multip
 lexed PhotoIonization Mass Spectrometry apparatus will also be presented. 
 Preliminary modelling results using global atmospheric model\, STOCHEM-CRI
 \, with implementation of these reactions will also be presented.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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