Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 24: Teilchen und Cluster I

O 24.8: Vortrag

Samstag, 5. März 2005, 16:45–17:00, TU EB301

The lateral Photoemission Distribution from a defined Cluster/Substrate System as probed by PEEM — •Michael Bauer, Carsten Wiemann, Martin Rohmer, Michael Munzinger, and Martin Aeschlimann — Fachbereich Physik, TU Kaiserslautern, 67663 Kaiserslautern

We used 2 Photon Photoemission Electron Microscopy (PEEM) to investigate the lateral distribution of the nonlinear photoemission yield from a defined and homogeneous system of silver clusters supported by a HOPG substrate. The PEEM images show very bright and well separated spots at the surface responsible for the dominant yield of a lateral integrating photoemission experiment. Furthermore, we find that the 2PPE signal for the latter case is strongly inhomogeneous broadened. A spectroscopy mode of the PEEM enables us to focus on the homogeneous contribution from a single emitter related to single electron excitations as well as collective (plasmon) excitations. In this way we are able to show that the emitter source is either a small silver particle or a number of strongly coupled silver particles.