Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures II
O 23.2: Talk
Tuesday, March 13, 2018, 11:00–11:15, MA 004
Identifying on-surface reaction products and orbital modifications with photoemission tomography — Xiaosheng Yang1,2, Philipp Hurdax3, Larissa Egger3, Daniel Lüftner3, Georg Koller3, Petra Tegeder4, F. Stefan Tautz1,2, Michael G. Ramsey3, •Peter Puschnig3, and Serguei Soubatch1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — 2Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, Germany — 3Institut für Physik, Karl-Franzens-Universität Graz, NAWI Graz, Austria — 4Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Germany
Dibromo-bianthracene (DBBA) has been shown to present an effective bottom-up strategy to fabricate atomically precise graphene nanoribbons on metal substrates. Here, we follow the thermally induced chemical reaction of DBBA deposited on Cu(110) to bisanthene (C28H14) by photoemission tomography. By comparison with density functional calculations, we can clearly identify a number of molecular orbitals associated with bisanthene including the filled LUMO. We unambiguously prove the chemical reaction taking place, clarify the molecular conformation and orientation before and after the reaction, and provide information on the charge state as well as on the electronic level alignment of the reaction product. Our work thus demonstrates the potential of photoemission tomography in monitoring complex reactions on surfaces.