Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.67: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Time-, energy-, and angle- resolved two-photon photoemission spectroscopy on Cu(1 1 11) with the Themis 1000 — •Jens Kopprasch1,2, Martin Teichmann1, Kristof Zielke1,2, Oliver Schaff3, Sven Mähl3, and Martin Weinelt1,2 — 1Max-Born-Institut, Max-Born-Straße 2a, 12489 Berlin, Germany — 2Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany — 3SPECS GmbH, Voltastraße 5, 13355 Berlin, Germany
We present two-photon photoemission measurements with the angle-resolved time-of-flight spectrometer THEMIS 1000. The electrostatic lens system of the electron analyzer PHOIBOS (SPECS) in combination with a delay-line detector allows us to measure the kinetic energy (Ekin) and the wave vector parallel to the surface (k∥) of the photoemitted electrons. Due to the axial symmetry of the spectrometer, kx and ky are detected without rotating the sample.
We present measurements on Cu(111), where we observe the first and second image-potential states. Furthermore, we measured the surface states at Cu(11 11), a vicinal surface with (001)-terraces. Depending on the k∥-direction, we observe different dispersion of the surface states and lifetimes.