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SUMMARY:Cooperative effects and the role of surface stress in lifting the 
 Au{111} herringbone reconstruction by adsorbing NO2: a direct insight from
  STM - Steve Driver
DTSTART:20060331T081500Z
DTEND:20060331T091500Z
UID:TALK4795@talks.cam.ac.uk
CONTACT:Dr Ruben M Garnica
DESCRIPTION:In this talk\, I shall summarize our recent STM results for lo
 w-temperature adsorption of NO2\, and coadsorption with CO\, on Au{111}.  
 The STM data reveal cooperative effects in the atomistic mechanism by whic
 h the clean-surface reconstruction is lifted.  Prior to this restructuring
 \, we see distortions of the herringbone pattern\, which we can understand
  within a Frenkel-Kontorova framework\, and which indicate the presence of
  locally compressive stress fields around the islands that drive mesoscopi
 c ordering of the islands.  By reference to a previous STM study by Kern a
 nd co-workers of the distribution of the Au{111} surface state across the 
 herringbone pattern\, we can account for the preference of NO2 to attack p
 articular locations on the surface.  A range of inter-related structures f
 orm when CO is coadsorbed with NO2 on Au{111} under various preparation co
 nditions.  In one of these structures\, the arrangement of the molecules l
 ocally confers chirality on the surface\, even though the surface and the 
 constituent molecules are all achiral.  Extended co-existing domains of bo
 th chiralities are formed.  Finally\, I will discuss potential implication
 s of this work for Au-catalysed reactions and for chiral synthesis.
LOCATION:U203\, Chemistry\, Department of
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