Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 25: Zeitaufgelöste Spektroskopie II
O 25.8: Vortrag
Samstag, 5. März 2005, 16:45–17:00, TU EB420
Scattering by Co adatoms between image-potential bands on Cu(001) — •Klaus Boger1, Martin Weinelt2, and Thomas Fauster1 — 1Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen — 2Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin
The increasing resolution and sensitivity of photoelectron spectroscopy reveals more and more details about the influence of defects. By means of time- and angle-resolved two-photon photoemission the various scattering processes induced by adsorbate atoms can be studied [1]. We now have examined the dynamics of electrons in image-potential states on the Cu(001) surface covered by statistically distributed Co adatoms. Even at low coverages of about 0.6% of a monolayer strong scattering from higher image-potential bands into the first one is observed. From the measured data the transfer of energy and parallel momentum at these scattering processes can be determined.
[1] K. Boger, M. Weinelt, and Th. Fauster, Phys. Rev. Lett. 92 (2004) 126803