BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Atmospherically significant reactions of Criegee intermediates - P
 rofessor Andrew Orr-Ewing\, University of Bristol
DTSTART:20200203T140000Z
DTEND:20200203T150000Z
UID:TALK133885@talks.cam.ac.uk
CONTACT:Dr Alex Archibald
DESCRIPTION:The oxidative removal of volatile organic compounds from the E
 arth’s atmosphere is mostly by reactions initiated by hydroxyl (OH) radi
 cals. However\, there is growing recognition of the importance of reaction
 s of ozone with unsaturated organic compounds\, both as a source of OH and
  of other reactive intermediates. This talk will focus on the chemistry of
  carbonyl oxides (more commonly known as Criegee intermediates) produced b
 y ozone reactions with alkenes. The zwitterionic / biradical character of 
 the Criegee intermediates causes unusual reaction pathways with trace orga
 nic atmospheric constituents such as alcohols and carboxylic acids. The pr
 oducts of these reactions are polar\, highly oxygenated organic species\, 
 the low vapour pressures of which encourage growth of secondary organic ae
 rosol particles. The Bristol group’s studies combine laboratory measurem
 ents of reaction rates\, synchrotron-based photoionization and mass spectr
 ometry identification of reaction products\, calculations of reaction path
 ways and kinetics\, and modelling of the atmospheric chemistry to assess t
 he importance of this Criegee intermediate chemistry in the troposphere.
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
END:VEVENT
END:VCALENDAR