Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Organic/bio Molecules on Metal Surfaces II
O 18.3: Vortrag
Montag, 11. März 2013, 16:30–16:45, H38
Orbital tomography: Deconvoluting photoemission spectra of organic molecules — •Sergey Soubatch1, Martin Willenbockel1, Benjamin Stadtmüller1, Kathrin Schönauer1, Eva Reinisch2, Thomas Ules2, Daniel Lüftner2, Markus Ostler3, Georg Koller2, Peter Puschnig2, Christian Kumpf1, Mike Ramsey2, and Stefan Tautz1 — 1Peter Grünberg Institut (PGI-3), JARA, Forschungszentrum Jülich, Germany — 2Institute of Physics, Karl-Franzens University Graz, Austria — 3Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Germany
The valence bands of organic molecules consist of closely spaced electronic levels, which is often challenging for both theory and spectroscopic experiment. We propose a tomographic method that employs the energy and momentum dependence of photoemission of adsorbed molecules to deconvolute corresponding valence band into individual orbitals beyond the limits of energy resolution.
Photoemission experiments on different ordered monolayer phases of perylene-tetracarboxylic-dianhydride (PTCDA) molecule on low index Ag surfaces were performed at BESSYII storage ring using toroidal electron energy analyzer. For the phases containing molecules non-equivalent either from intermolecular environment or substrate registry point of view, method provides access to electronic properties of either molecule separately. This enables detailed description of site- and orientation-specific bonding of organic molecules at metals, and in so doing, delivers stringent tests for the development of ab-initio electronic structure theory.