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CATEGORIES:Physics and Chemistry of Solids Group
SUMMARY:Electronic friction and excitations in molecule-su
 rface interactions - M. Persson\, Surface Science 
 Research Centre\, Dept. of Chemistry\, The Univers
 ity of L:iverpool
DTSTART;TZID=Europe/London:20080117T160000
DTEND;TZID=Europe/London:20080117T170000
UID:TALK9908AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/9908
DESCRIPTION:A long-standing issue in surface science has been 
 the role of electronic non-adiabaticity in the int
 eractions of atoms and molecules with metal surfac
 es. The absence of any energy gap for electron-hol
 e pair excitations of a metal substrate results in
  general of a breakdown of the adiabatic (Born-Opp
 enheimer) approximation for the electronic motion 
 in response to ionic motion. A key question is whe
 ther this electronic non-adiabaticity is sufficien
 tly strong to be important in dynamical processes 
 at surfaces or not. The progress in the theoretica
 l description of the electronic structure of adsor
 bates using density functional theory has made it 
 possible to calculate the electronic non-adiabatic
  coupling for more or less realistic systems and w
 e can now address this question in a more quantita
 tive manner. A most elementary case is provided by
  electron-hole pair damping of adsorbate vibration
 s\, whose theoretical treatment will be the starti
 ng point for this talk that will cover theory of e
 lectronic adiabaticity in transition state dynamic
 s\, hot-electron induced surface chemistry\, chemi
 cally-induced electronic excitations upon adsorpti
 on of atoms and molecules\, and exo-electron emiss
 ion in vibrational de-excitation in scattering fro
 m surfaces?
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Departm
 ent of Physics
CONTACT:Stephen Walley
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