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Physisorbed Rare Gas Adlayers

  • Klaus Kern
  • George Comsa
Part of the Springer Series in Surface Sciences book series (SSSUR, volume 10)

Abstract

Within the Born-Oppenheimer approximation, the motion of a rare gas atom in front of a substrate surface can be described with a three dimensional potential energy relief, depending on two coordinates parallel V(x,y) and one perpendicular to the surface V(z). Since the electron affinity of the rare gases is negative and their ionization energy is large compared to the work function of almost all substrates, the electronic configuration of the rare gas atom is only slightly perturbed upon adsorption. Thus, rare gases interact with substrates mainly via induced dipole forces (van der Waals interaction), which can be modelled by a superposition of a long-range van der Waals attractive term (decaying as z-3) and a short range repulsive term. The corresponding adsorption potential is shown in Fig.2.1; the minimum of V(z) determines the adsorption energy in the limit of zero coverage. Particles which are bound to surfaces via these dispersion forces are called physisorbed. Typical physisorption energies range from several to hundreds of meV.

Keywords

Domain Wall Electron Energy Loss Spectroscopy Probe Particle Wall Width Incommensurate Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • Klaus Kern
    • 1
  • George Comsa
    • 1
  1. 1.Institut für Grenzflächenforschung und VakuumphysikKernforschungsanlage JülichJülichFed. Rep. Germany

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