Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 40: Organic Molecules on Inorganic Substrates III: Electronic, Optical and other Properties
O 40.8: Talk
Tuesday, March 17, 2020, 12:15–12:30, REC C 213
Kekulene synthesised on copper surfaces: Orientation and electronic properties — •Anja Haags1,2, Qitang Fan5, Xiaosheng Yang1,2, Larissa Egger3, Hans Kirschner4, Tim Naumann5, Simon Werner5, Jörg Sundermeyer5, François C. Bocquet1,2, Georg Koller3, Alexander Gottwald4, Mathias Richter4, Michael G. Ramsey3, Peter Puschnig3, Serguei Soubatch1,2, F. Stefan Tautz1,2, and Michael Gottfried5 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany — 3Institute of Physics, University of Graz, NAWI Graz, 8010 Graz, Austria — 4Physikalisch-Technische Bundesanstalt (PTB), 10587 Berlin, Germany — 5Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
The polycyclic aromatic molecule kekulene was synthesised on the copper (111) and (110) surfaces from a molecular precursor using a surface-assisted reaction. Scanning tunneling microscopy showed compact well-ordered monolayers of kekulene proving a high reaction yield. To address electronic properties of kekulene, we carried out momentum-space imaging photoelectron spectroscopy experiments. The photoemission intensity distributions of particular molecular states are compared to density functional theory calculations of free kekulene using the plane wave final state approximation. It allows us to prove the chemical nature of the reaction product and to elucidate its orientation and electronic structure on both copper surfaces.