Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 5: Electron and spin dynamics I

O 5.1: Talk

Monday, March 22, 2010, 11:15–11:30, H34

Image-potential states on Au(100) measured by Two-Photon Photoemission — •Tobias Bierlein, Daniel Niesner, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen

Most metals do not have reconstructions of their clean surfaces at room temperature. But Au(100) and Ir(100) surfaces always reorder to (5x20) respectively (5x1) reconstructions. There are some methods to break this reconstructions and obtain (1x1) surfaces. The resulting surfaces were examined for work function and image-potential states with Two-Photon Photoelectron Spectroscopy (2PPE). 2PPE uses two short laser pulses for the emission of electrons. The first pulse excites the electrons into the image potential states, the second pulse emits them into free electron states. Measurements were performed using a display analyzer, which allows to detect electrons from a large range of emission angles. With this method binding energies and dispersion of image-potential states were determined.