Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 44: Focussed session: Functional molecules at surfaces II
O 44.10: Talk
Wednesday, March 28, 2012, 13:15–13:30, A 053
Adsorption height of benzene and azobenzene on Ag(111) and Cu(111) — •Martin Willenbockel1, Giuseppe Mercurio1, Erik R. McNellis2, Christopher Bronner3, Benjamin Stadtmüller1, Stephan Meyer3, Erwan Varene3, Michael Schulze3, Isabel Martin3, Sebastian Hagen3, Felix Leyssner3, Jörg Meyer2, Serguei Soubatch1, Martin Wolf2,3, Karsten Reuter4, Petra Tegeder3, and F. Stefan Tautz1 — 1Peter Grünberg Institut 3, Forschungszentrum Jülich and JARA, Jülich, Germany — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 3Fachbereich Physik, Freie Universität Berlin, Berlin, Germany — 4Technische Universität München, Garching, Germany
Research focused on the interactions at organic/metal interfaces revealed that weak long-range van-der-Waals (vdW) forces play a significant role in the bonding mechanism. However, a clear experimental gauge is needed to judge to which extent the vdW interactions influence the adsorption strength. For molecules at surfaces the height of adsorption is known to satisfy this need.
Here we report the normal-incidence x-ray standing waves data on the adsorption height of the classical aromatic molecule benzene on Ag(111) and Cu(111) surfaces. In these systems the contribution of vdW interactions to the bonding is meant to be dominant. To identify the effect of additional chemical interaction channels, we furthermore studied the adsorption of azobenzene, a molecule containing two benzene rings linked by a diazo-bridge. Achieved experimental results are compared to density functional theory calculations.