Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.95: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
2PPE-measurement on Cu(1 1 11) with an angle-resolving time-of-flight spectrometer — •Thomas Kunze1,2, Jens Kopprasch1,3, Martin Teichmann1,3, Thorsten U. Kampen2, and Martin Weinelt1,3 — 1Max Born Institut, Max-Born-Straße 2a, 12489 Berlin, Germany — 2SPECS GmbH, Voltastr. 5, 13355 Berlin, Germany — 3Freie Universitat Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany
We aim at the implementation of an advanced concept for photoemission spectroscopy into a robust and reliable experiment for time- and energy-resolved photoemission with ultrahigh transmission. The basic idea is to combine a parallel imaging technique comprising ultimate k→-resolution with time-of-flight energy dispersion. Therefore we developed, in cooperation with SPECS GmbH, the angular-resolving Time-of-Flight spectrometer THEMIS. This instrument allows us to measure energy E over parallel momentum kx || and ky || without rotating the sample.
We present two-photon photoemission measurements on Cu(1 1 11), a vicinal copper surface with (001)-terraces. The dispersion of the image-potential states reveals back-folding and mini-gap opening with the periodicity of the step superlattice. The lifetimes of the image-potential states at Cu(1 1 11) depend on the parallel momentum of the photoemitted electrons.