Münster 1997 – wissenschaftliches Programm
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CP: Chemische Physik
CP 8: Simulationen an GrenzflächenOrganisation: P. Reineker
CP 8.7: Vortrag
Donnerstag, 20. März 1997, 17:00–17:15, Ger
Linear sliding friction: on the origin of the microscopic friction for Xe on silver — •B.N.J. Persson1 and A. Nitzan2 — 1Institut f"ur Festk"orperforschung
Forschungszentrum J"ulich, D-52425 J"ulich, Germany — 2School of chemistry
Tel Aviv University, Tel Aviv, 69978 Israel
We have performed a computer simulation study of the force required to slide xenon mononolayer and bilayers on a silver surface. With information about the adsorbate-substrate interaction potential deduced from experimental data we find that for an incommensurate monolayer film the observed sliding friction is very close to the parallel microscopic friction which act on the individual adsorbates, which is of mainly electronic origin. For the bilayer film a small fraction of the observed sliding friction arises from internal excitations in the film, and the rest from the direct energy transfer to the substrate via the electronic friction.