Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.69: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Femtosecond VUV and Soft X-Ray Pulses for Surface Spectroscopy — Robert Carley1, Kristian Döbrich1, Cornelius Gahl1, •Matin Teichmann1, Kai Godehusen2, Olaf Schwarzkopf2, Frank Noack1, Philippe Wernet2, and Martin Weinelt1,3 — 1Max-Born-Institut, Max-Born-Straße. 2A, 12489 Berlin, Germany — 2Helmholtz-Zentrum für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 3Fachbereich Physik der Freien Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
We present initial characterization results of a newly developed high-order harmonics (HHG) VUV beamline. It will be used to perform time-resolved studies of metal- and semiconductor surfaces, and of gas-phase molecular systems, and we show our first photoemission spectra from the W (110) surface. The HHG source is driven by the output of a commercial Ti-sapphire multipass laser amplifier generating 40 fs pulses at a repetition rate of 10 kHz, focused into an Ar-filled gas cell to create high-order harmonics. Following separation from the IR with an Al foil filter, a toroidal mirror images the HHG source onto the entrance slit of a toroidal grating monochromator, which selects a particular harmonic and the bandwidth of the transmitted radiation. A second toroidal mirror images the output slit of the monochromator onto the experimental sample housed in a custom-built UHV chamber equipped with a image-type hemispherical electron kinetic energy analyser. The VUV can be combined with a time-delayed IR pump beam from the driving laser in order to perform time-resolved measurements.