Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 69: Metal Substrates: Clean Surfaces

O 69.3: Talk

Friday, March 30, 2007, 10:45–11:00, H41

Image-potential states examined by a "Display-Type Analyzer" — •Matthias Gubo and Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen

The Rydberg-like series of image-potential states is a prototype system for loosely bound electrons at a metal surface. The electronic structure and the femtosecond dynamics of these states are studied by energy- and time-resolved two-photon photoemission.

A two-dimensional, multi-angle energy analyzer is used for electron detection. It consists of an ellipsoidal mirror low pass filter, a retarding field high pass filter, microchannel plates as an area detector and an image processing system for data acquisition [1].

The image-potential states on the clean Cu(001) surface were successfully imaged. The results are in good agreement with previous measurements using hemispherical analyzers. Several methods to analyze the multidimensional data sets are discussed.

[1] D. Rieger, R. D. Schnell, W. Steinmann und V. Saile, Nucl. Instr. Methods 208 (1983) 777