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SUMMARY:Radical recycling from VOC oxidation in clean-air - Dr Terry Dillo
 n (University of York)
DTSTART:20140303T141500Z
DTEND:20140303T153000Z
UID:TALK49283@talks.cam.ac.uk
CONTACT:Dr Amanda Maycock
DESCRIPTION:Radicals initiate the breakdown of the vast quantity and varie
 ty of volatile organic compounds (VOC) emitted to the atmosphere. Understa
 nding radical budgets is crucial therefore to enable calculation of VOC li
 fetimes\, assess impacts on air quality\, chemistry and climate\, and conf
 idently predict future trends. Recent results from lab-\, field-\, model- 
 and theoretical-work demonstrate that clean-air radical chemistry is poorl
 y understood\, even for important species such as OH. Radicals are consume
 d by VOC (R1)\, but may be recycled in subsequent oxidation steps such as 
 (R2b & R3b).\n\n	OH + RH	->	R 	(R1)\n\n	R + O2 (+ M)	->	RO2 (+ M)	(R2a)\n\
 n		        ->	OH + (other products)	(R2b)\n\n	HO2 + RO2 	->	ROOH + O2 	(R3
 a)\n\n		        ->	OH + RO + O2	(R3b)\n\nWhilst traditional chemical schem
 es would predict little radical recycling in clean-air\, with formation of
  phytotoxic peroxides or peracids (R3a)\, large OH yields (R3b) have been 
 identified for carbonyl-containing RO2. In recent work conducted at the Ma
 x Planck Institute for Chemistry\, Mainz\, and at the School of Chemistry\
 , University of Leeds\, we have focussed on the clean-air oxidation of the
  important biogenic VOC isoprene (C5H8). Experimental techniques used have
  included Pulsed Laser Photolysis coupled to Laser Induced Fluorescence de
 tection of OH (Mainz) and a suitably equipped environmental chamber (HIRAC
 \, Leeds). A number of isoprene-related radical recycling yields will be p
 resented\, together with some mechanistic information for the most extensi
 vely studied system (R = CH3CO). Atmospheric implications of these and oth
 er results will be discussed. \n
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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