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SUMMARY:Synchrotron Adventures with Criegee Intermediates: Studies of Trop
 ospheric Chemistry in the Lab - Rebecca Caravan\, Sandia National Labs
DTSTART:20181105T141500Z
DTEND:20181105T151500Z
UID:TALK112804@talks.cam.ac.uk
CONTACT:Dr Alex Archibald
DESCRIPTION:Criegee intermediates are reactive intermediates formed in the
  troposphere principally from the ozonolysis of alkenes. However\, Criegee
  intermediates are short lived and have a low steady-state concentration f
 ollowing production via ozonolysis reactions\, making laboratory studies o
 f their chemical behaviour challenging. The advent of photolytic methods t
 o produce Criegee intermediates has facilitated direct studies of their re
 activity that have shown some bimolecular reactions of Criegee intermediat
 es to be orders of magnitude faster than previously thought. Several key C
 riegee intermediate reactions have been investigated utilizing the Sandia 
 Multiplexed Photoionization Mass Spectrometer instrument (MPIMS). When cou
 pled to the tuneable-VUV output of the Chemical Dynamics Beamline at the A
 dvanced Light Source (Lawrence Berkeley National Laboratory)\, the MPIMS e
 nables acquisition of 3-D datasets (mass\, kinetic time\, and photoionizat
 ion energy) allowing direct and unambiguous chemical kinetics and mechanis
 tic studies of Criegee intermediates to be undertaken following their phot
 olytic production. Some recent results from MPIMS studies of Criegee inter
 mediates will be discussed\, with particular attention to those pertaining
  to the generation of highly oxygenated products.
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
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