Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Focussed Session: Towards a Quantitative Understanding of Complex Adsorption Structures: Surface Science goes Organic II
O 69.7: Vortrag
Donnerstag, 3. April 2014, 12:30–12:45, HSZ 01
Adsorption geometry and electronic structure of iron phthalocyanine on Ag surfaces revealed by photoelectron momentum mapping — •Vitaliy Feyer1,2, Martin Graus3,4, Pascal Nigge3,4, Michael Wiessner3,4, Robert G. Acres2, Carsten Wiemann1, Claus M. Schneider1,5, Achim Schöll3,4, and Friedrich Reinert3,4 — 1Research Center Jülich, 52425 Jülich, Germany — 2Sincrotrone Trieste, 34012 Basovizza, Trieste, Italy — 3Universität Würzburg, 97074 Würzburg, Germany — 4Karlsruher Institut für Technologie KIT, 76021 Karlsruhe, Germany — 5Universität Duisburg-Essen, D-47048 Duisburg, Germany
We report a comprehensive study of the adsorption behavior of iron phthalocyanine on the low-index crystal faces of silver. Experiments were carried out at the NanoESCA beamline of the Elettra synchrotron. The experimental setup includes a non-magnetic, electrostatic photoelectron emission microscope and a double-pass hemispherical analyzer that directly images a parallel momentum component of photoelectron at a fixed binding energy. A combination of photoelectron momentum mapping (PMM) and low-energy electron diffraction (LEED) provides access to the superstructure unit cell and the arrangement of the molecules within the unit cell. Additionally, momentum patterns give information about the electronic structure at the interface and the symmetry of molecular orbitals. Comparative analysis of the PMM of the lowest unoccupied molecular orbitals (LUMO) of FePc on the substrates with different symmetry indicates that both degenerate LUMOs receive charge transfer from the substrate.