Ultraviolet Surface Photochemistry and Charge Transfer

  • E. P. Marsh
  • F. L. Tabares
  • M. R. Schneider
  • J. P. Cowin
Conference paper
Part of the Springer Series in Surface Sciences book series (SSSUR, volume 13)


Excimer lasers can initiate surface photochemistry, and are of particular importance in the fabrication of semiconductor electronics [1]. The energy of the photons, 3.5 to 8 eV, can raise many molecules to reactive states. On a metal or semiconductor surface, however, the time for competitive quenching (energy transfer) or charge transfer to the substrate is very fast, 10−13 to 10−15 seconds [2], Thus only very fast photochemical processes like photodissociation via repulsive states are likely to occur on these surfaces. The surface can still perturb even such a fast process. A simple way is “kinematically”: i.e., the surface or co-adsorbates can act as third bodies for energy or momentum transfer [3]. Also, through bonding, the surface can change the potentials along which the photochemistry proceeds. And finally, even if a surface photo-process can “out-run” competitive quenching or charge transfers, it still may be perturbed by them.


Charge Transfer Rate Thermal Desorption Spectrum Ground State Molecule Repulsive State Resonant Transfer 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • E. P. Marsh
    • 1
  • F. L. Tabares
    • 1
  • M. R. Schneider
    • 1
  • J. P. Cowin
    • 2
  1. 1.Chemistry DepartmentUniversity of CaliforniaSanta BarbaraUSA
  2. 2.Facultad de QuimicaUniversidad CompletenseMadridSpain

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