Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 88: Metal substrates: Adsorption of organic / bio molecules IX
O 88.8: Vortrag
Donnerstag, 17. März 2011, 19:00–19:15, PHY C213
K-resolved Inverse Photoemission on ultrathin PTCDA/ Ag(110) films — •Dirk Hauschild1, Markus Scholz1, Peter Puschnig2, Achim Schöll1, and Friedrich Reinert1, 3 — 1Universität Würzburg, Experimentelle Physik VII, D-97074 Würzburg, Germany — 2University of Leoben, Chair of Atomistic Modelling and Design of Materials, A-8700 Leoben, Austria — 3Karlsruhe Institut für Technologie (KIT), Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany
The occupied valence regime of metal-organic interfaces has been intensively studied by e.g. angular resolved UV-photoelectron spectroscopy allowing direct identification of molecule-metal hybrid states due to interfacial interaction [1]. However, the unoccupied valence levels are much more complicated to access experimentally limiting the knowledge about the contribution of these orbitals on the interface bonding. K-resolved Inverse Photoelectron Spectroscopy (KRIPES) is a technique to study the unoccupied density of states of inorganic materials. We present the first KRIPES-measurement on an organic monolayer adsorbed on a metal surface and discuss the applicability of KRIPES on orbital tomography established for PES. The single-domain monolayer system PTCDA/Ag(110) shows two non-dispersing states. Comparison of the experimental variation of the KRIPES-spectra intensity and DFT calculation of the free PTCDA molecule identifies the first state as the LUMO+1. The origin of the second state is not clear yet but shows influences of LUMO+1 and LUMO+2.
[1] J. Ziroff et. al., Phys. Rev. Lett., 104, 233004 (2010)