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SUMMARY:Atmospheric Reactions of Peroxy Radicals – Key Intermediates in 
 Ozone Formation and Loss - Dr Geoff Tyndall\, NCAR Colorado USA
DTSTART:20101012T131500Z
DTEND:20101012T141500Z
UID:TALK25910@talks.cam.ac.uk
CONTACT:Dr Alex Archibald
DESCRIPTION:Hydroperoxy radicals\, HO2\, are central to atmospheric chemis
 try. In regions of the troposphere impacted by nitrogen oxides (NOx = NO +
  NO2) they are involved in ozone formation. On the other hand\, in the rem
 ote troposphere (e.g.\, the marine boundary layer) or in the stratosphere 
 they play an important role in ozone depletion. Closely related are the or
 ganic peroxy radicals\, denoted as RO2 (where R represents an organic grou
 p). The chemistry of all these peroxy radicals in the atmosphere is couple
 d\, via chain propagation steps which lead to their interconversion\, and 
 also by mutual loss processes.\n\nAt NCAR we study the reactions of organi
 c compounds using two laboratory techniques. In the first\, we use Fourier
  Transform Infrared Spectrometry to investigate the overall product yields
 . The second involves time-resolved IR laser spectroscopy to detect HO2 (h
 ydroperoxy) radicals directly. Both systems can be\ntemperature-regulated\
 , to obtain data relevant to the entire troposphere. Coupled together\, th
 e two techniques offer a powerful means to study atmospheric oxidation mec
 hanisms.\n\nThis talk will summarize some recent experimental studies of t
 he chemistry of peroxy radicals under low-NOx conditions\, including the s
 elf-reactions of\nHO2 radicals and their reactions with carbonyl species. 
 Recent mechanistic developments related to peroxy radical regeneration in 
 the atmosphere will also\nbe discussed.
LOCATION:Pfizer  Lecture Theatre\,  Department of Chemistry
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