Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.54: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Quasiparticle lifetimes of rare-earth elements, transition metals and noble metals — •Alexander Mönnich, Jörg Lange, Michael Bauer, and Martin Aeschlimann — FB Physik, TU Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern
The dynamics of excited (hot) electrons play an important role in surface physics and chemistry. It is therefore important to address the question of how the bulk electronic structure influence the mean free path and the excited electron lifetimes. For excitation energies >10 eV the so called universal curve allows a rather good estimate of these quantities. However, at low excitation energies (E−EF<10 eV) there can be significant deviations from this approximation.
With the time resolved two-photon photoelectron spectroscopy (TR-2PPE) method we investigated the electron dynamics in various noble, transition and rare earth metals up to excitation energies E−EF=3 eV. The characteristics of the electronic structure of the respective metal classes responsible for energy dissipation processes of hot electrons will be analyzed by comparing our experimental data in to different theoretical results.