Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 13: Symposium: Ultrafast Nanooptics II
O 13.3: Hauptvortrag
Montag, 26. März 2007, 15:15–15:45, H38
Attosecond resolved photoemission from metal surfaces — •Ulrich Heinzmann — University of Bielefeld, Faculty of Physics
The combination of the comb of high
harmonics of a phase-stabilized ultrashort laser pulse focussed into a rare gas
atomic beam1 with an optimized multilayer mirror system as soft x-ray
monochromator2 yields isolated soft x-ray pulses of 250 and less attoseconds
duration3. Thus photoelectron and Auger electron emission processes in atoms have
been studied time resolved with a sub-fs time resolution4. The report discusses
the efforts to apply these techniques in attosecond time resolved photoemission of
condensed matter. It presents very first results of attosecond resolved photoelectron
emission spectroscopy from a single crystal5 and discusses what can be learned
about the electronic dynamics in the bands of the surface and of the few atomic bulk
layers the photoelectrons come from.
[1] R. Kienberger et al. Nature
427, 817 (2004)
[2] A. Wonisch et al. Applied Optics 45, 4147 (2006)
[3] E. Goulielmakis et al. Science 305, 1267 (2004)
[4] M. Drescher et al. Nature 419, 803 (2002)
[5] A. Cavalieri et al. to be published (2007)