Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.95: Poster
Tuesday, March 15, 2011, 18:30–22:00, P4
Time-resolved ARPES studies with high-oder harmonic radiation — Robert Carley1, Kristian Döbrich1, •Björn Frietsch1,2, Cornelius Gahl1, Martin Teichmann1, Kai Godehusen3, Olaf Schwarzkopf3, Philippe Wernet3, Frank Noack1, and Martin Weinelt1,2 — 1Max-Born-Institut, Berlin — 2Fachbereich Physik, Freie Universität, Berlin — 3Helmholtz-Zentrum für Materialien und Energie (BESSY II), Berlin
We present characterization results of our newly developed high-order harmonics XUV source and beamline. The scope of this new setup is to provide XUV photons between 20-65 eV, at an energy resolution of a few 100 meV and a pulse duration ≥ 100 fs for time-resolved photoelectron spectroscopy studies of metal and semi-conductor surfaces as well as gas-phase experiments.
40-fs pulses from a commercial amplified Ti:Sapphire laser system running at 10 kHz repetition rate are focused into an argon-filled gas cell to create harmonics, currently up to the 25th order (=38.4 eV). We select the XUV wavelength and energy resolution using a toroidal grating monochromator. Our current resolution is 170 meV and the time resolution is 140 fs (both FWHM) at a reasonable harmonic yield. We performed first pump-probe experiments on the lanthanide metals Gadolinium and Terbium.