BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Direct Detection of Criegee Intermediates and Reaction Products  U
 sing Time-Resolved Absorption Spectroscopy - Dr Dan Stone\, University of 
 Leeds
DTSTART:20161031T141500Z
DTEND:20161031T151500Z
UID:TALK67847@talks.cam.ac.uk
CONTACT:Valerio Ferracci
DESCRIPTION:Criegee biradicals (RCH2OO) are key reaction intermediates in 
 the atmospheric degradation of unsaturated volatile organic compounds (VOC
 s) and have been implicated in radical chain branching reactions in combus
 tion of the biofuel dimethyl ether (DME). In the atmosphere\, Criegee bira
 dicals play an important role in the production of OH and HO2 radicals\, a
 nd the OH source from Criegee biradicals has been shown to be particularly
  important in urban environments in winter when photolytic sources are low
 .\n\nRecent interest in Criegee intermediates has largely focused on the k
 inetics of their bimolecular reactions. However\, unimolecular decompositi
 on reactions of stabilised Criegee intermediates are potentially significa
 nt as loss mechanisms in the atmosphere\, and unimolecular decomposition o
 f CH2OO is likely to be important under combustion conditions. In addition
 \, the atmospheric impacts of Criegee intermediates are dependent on the n
 ature of the reaction products\, which are subject to large uncertainties.
 \n\nCurrent work in Leeds is focussed towards the measurement of direct re
 action kinetics for Criegee intermediates using broadband time-resolved ul
 traviolet absorption spectroscopy\, and the development of time-resolved i
 nfrared absorption spectroscopy for the determination of product yields. R
 ecent investigations of the reactions of CH2OO with SO2 and NO2 will be di
 scussed\, and the results of a recent study of the unimolecular decomposit
 ion reactions of CH2OO and CH3CHOO\, conducted in collaboration with group
 s at the Sandia National Laboratory\, US\, will be presented. \n
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
END:VEVENT
END:VCALENDAR