Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.82: Poster

Dienstag, 9. März 2010, 16:00–19:00, Lichthof

A high-harmonic microfocus beamline for photoemission spectroscopy — •Roland Kalms, Armin Azima, Filip Budzyn, Patrick Rüdiger, Thomas Klee, Michael Schulz, Lasse Schroedter, Marek Wieland, and Markus Drescher — Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

We present the design and characterisation of a high-harmonic beamline with an experimental endstation suited for photoemission spectroscopy on (magnetised) surfaces. The pulses of a femtosecond laser system (800 nm, 3 mJ, 30 fs, 1 kHz) are focussed into a gas-filled tube to create high-harmonic emission. The output in the VUV-range (around 90 eV with Neon as target medium) which can be spectrally characterised with a self-made grating spectrometer has been optimised with respect to the intensity and the beam profile. After the selection of the desired harmonic order via a multilayer mirror the radiation is focussed with an ellipsoidal mirror onto the sample surface. The experimental endstation of the beamline allows the in-situ preparation of thin films and is equipped with a time-of-flight spectrometer and a scanning stage for spatially resolved photoemission studies. One can also apply a pulsed magnetic field to remanently magnetise the samples for XMLDAD measurements.