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O: Oberflächenphysik
O 34: Particles and clusters II
O 34.3: Vortrag
Donnerstag, 30. März 2006, 11:45–12:00, WIL A317
Plasmon excitations in clusters in the vicinity of metal surfaces — •Yaroslav Pavlyukh and Wolfgang Hübner — Department of Physics, Kaiserslautern University, Box 3049, D-67653, Kaiserslautern, Germany
We study the collective excitations of metal clusters approaching a metal surface. Using a simple model for the frequency-dependent dielectric constant ε(ω) and the multiple scattering method we numerically investigate the shift in the plasmon resonance due to the coupling of the collective modes of the sphere with those of its mirror image. Results of the model calculation are verified by means of ab initio theory. As a prototypic system we study Na9+ cluster on the Cu (100) surface. The representation of the solid surface by a cluster of several, typically 54 substrate atoms is used in the combination with a high level configuration interaction (CI) calculation.