Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 60: Poster Session III (Methods: Atomic and electronic structure; Methods: electronic structure theory; Methods: Molecular simulations and statistical mechanics; Methods: Sanning probe techniques; Methods: other (experimental); Methods: other (theory) )

O 60.1: Poster

Wednesday, March 24, 2010, 17:45–20:30, Poster B2

Two-Photon Photoelectron Spectroscopy using a Display Analyzer — •Daniel Niesner, Tobias Bierlein, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen

Two-Photon Photoelectron Spectroscopy is a pump and probe technique which allows observation of excited electronic states in solids. After excitation by a first laser pulse a second one removes electrons into vacuum where they are detected by an analyzer. In the display analyzer the sample is placed in one of the focal points of an ellipsoidal mirror which serves as a low pass filter. Subsequently the photoelectrons pass through a retarding high pass filter and are detected by microchannel plates. While most common analyzers are able to detect only electrons emitted in one angular direction, in this setup the two-dimensional angular distribution of electrons emitted into a cone of 90° is measured. We present data from image-potential states on the (001) surfaces of copper and iridium. An energy resolution of 90 meV and an angular resolution of 5° is found.