Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Organic/bio Molecules on Metal Surfaces II
O 18.2: Vortrag
Montag, 11. März 2013, 16:15–16:30, H38
Orbital ordering for PTCDA on Ag surfaces — •Martin Willenbockel1,2, Benjamin Stadtmüller1,2, Kathrin Schönauer1,2, Francois C. Bocquet1,2, Daniel Lüftner3, Eva M. Reinisch3, Thomas Ules3, Georg Koller3, Christian Kumpf1,2, Serguei Soubatch1,2, Peter Puschnig3, Michael G. Ramsey3, and F. Stefan Tautz1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany — 3Institut für Physik, Karl-Franzens-Universität Graz, 8010 Graz, Austria
The energy alingment of electronic levels for molecules adsorbed on noble metal surfaces was investigated extensively. However, the research was focused mainly on the frontier orbitals located close to the Fermi level, namely the LUMO (lowest unoccupied molecular orbital) and HOMO (highest occupied molecular orbital).
We report a study of PTCDA (3,4,9,10-perylene-tetracarboxylic-dianhydride) adsorbed on the low index Ag surfaces Ag(100), Ag(111) and Ag(110) where the fine structure of the "HOMO-1" resonance was investigated by angle resolved photoemission spectroscopy. Using the orbital tomography approach we found that this resonance consists of 4 close located molecular orbitals [1,2]. The energy ordering of the orbitals is independent from the Ag surface and the molecular superstructure.
[1] P. Puschnig et al., Phys. Rev. B 84 235427 (2011). [2] P. Puschnig et al., Science 326 702 (2009).