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SUMMARY:Interactions between the OH radical and atmospheric gases - Dr Cra
 ig Murray\, University of Bristol
DTSTART:20100517T131500Z
DTEND:20100517T141500Z
UID:TALK24036@talks.cam.ac.uk
CONTACT:Dr Francis Pope
DESCRIPTION:The hydroxyl radical plays a major role in atmospheric and com
 bustion environments where it is often detected using laser-induced fluore
 scence.  I will discuss the intermolecular interactions between OH radical
 s and partner molecules found in these environments from two different per
 spectives.  In the first part\, I will describe the current data on the hy
 drotrioxy radical (HOOO)\, which has been postulated to be an intermediate
  in several atmospheric reactions and potentially a temporary sink for OH 
 through association with molecular oxygen.  Infrared action spectroscopy h
 as been used to characterize the vibrational modes of both conformers of H
 OOO\, give insight into the nature of the bonding and provide a rigorous u
 pper limit to the dissociation energy.  In the second part\, I will discus
 s the dynamical outcomes of collisional quenching of electronically excite
 d OH radicals by molecular partners\, through measurements of nascent grou
 nd state population distributions and the branching between reactive and n
 on-reactive pathways.  The observations will be rationalized as dynamical 
 signatures of the non-adiabatic passage through seams of conical intersect
 ion that couple the ground and electronically excited PESs. 
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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