Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 40: Elektronische Struktur V
O 40.2: Vortrag
Freitag, 28. März 2003, 11:30–11:45, M\"UL/ELCH
Unexpected surface sensitivity at high energies in angle-resolved photoemission — •Philip Hofmann1, Christian Søndergaard1, Søren Agergaard1, Søren Vrønning Hoffmann1, Julio Esteban Gayone2, Guillermo Zampieri2, Silvano Lizzit3, and Alessandro Baraldi4 — 1Institute for Storage Ring Facilities, University of Aarhus, DK-8000 Aarhus C — 2Centro Atómico Bariloche and Instituto Balseiro, CNEA, 8400-Bariloche, Argentina — 3Sincrotrone Trieste, 34012-Trieste, Italy — 4Dipartimento di Fisica, Universitá di Trieste, 34127-Trieste, Italy
Angle-resolved photoemission data from Al(001) taken with photon energies up to several hundred electron volts show an unexpected surface sensitivity at high energies. The surface state at the centre of the surface Brillouin zone can be clearly observed up to photon energies higher than 700 eV and the surface to bulk intensity ratio appears to increase with photon energy, despite the longer inelastic mean free path of the electrons and the increased vibrational amplitude at the surface. We explain this surprising behaviour by considering the effect of phonon excitation in the photoemission event.