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O: Oberflächenphysik

O 12: Methods

O 12.2: Talk

Monday, March 27, 2006, 15:15–15:30, WIL B321

Characterization of a time-of-flight spectrometer using photoemission with higher harmonic radiation — •Andrea Melzer, Alvaro Wulff, Jinxiong Wang, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, D-91058 Erlangen

By focussing laser pulses with 1.4 mJ energy, 30 fs pulse length and 779 nm wavelength from a multipass amplifier at a repetition rate of 1 kHz into argon photon energies up to 52 eV are generated. A grating monochromator with two interchangable toroidal gratings (250 and 950 lines/mm) is used to select individual harmonics. A time-of-flight spectrometer for electrons is designed with a large detection angle of 34^∘. A fast detection electronics is used with a time-resolution of 200 picoseconds to obtain an energy resolution in the meV range. A Cu(111) surface was used to characterize the time-of-flight spectrometer and the results are compared to data obtained on the same surface with a hemispherical energy analyzer.