Hannover 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
K: Fachverband Kurzzeitphysik
K 6: Poster
K 6.5: Poster
Donnerstag, 11. März 2010, 16:30–19:00, Lichthof
Femtosecond VUV and Soft X-Ray Pulses for Surface Spectroscopy — •Robert Carley1, Kristian Döbrich1, Cornelius Gahl1, Martin 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 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.