Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Inorganic/organic interfaces: Electronic properties II (joint session O, CPP)

CPP 53.8: Talk

Wednesday, March 18, 2015, 17:00–17:15, HE 101

The geometric and electronic structure of TCNQ and TCNQ+Mn on Ag(001) surface — Vitaliy Feyer¹, Martin Graus^2,3, •Giovanni Zamborlini¹, Robert G. Acres⁴, Achim Schöll^2,3, Friedrich Reinert^2,3, and Claus M. Schneider^1,5 — ¹Research Center Jülich, 52425 Jülich, Germany — ²Universität Würzburg, Experimentelle Physik VII & Röntgen Research
Center for Complex Material Systems RCCM, 97074 Würzburg, Germany — ³Karlsruher Institut für Technologie KIT, Gemeinschaftslabor für Nanoanalytik, 76021 Karlsruhe, Germany — ⁴Sincrotrone Trieste, 34012 Basovizza, Trieste, Italy — ⁵Universität Duisburg-Essen, D-47048 Duisburg, Germany

We have investigated the geometric and electronic structure of ordered monolayers of TCNQ and of TCNQ+Mn on Ag(001) surface by LEED and photoelectron momentum microscopy (at the NanoESCA beamline of the Elettra synchrotron). Two coverage dependent, commensurable superstructures are established on Ag(001) while the co-adsorption of Mn results in the formation of a long-range ordered mixed metal-organic superstructure, which is also commensurate. From ARPES pattern of the TCNQ LUMO the azimuthal orientation of the molecules in the respective unit cell can be determinate. The PES data shows, in the case of TCNQ/Ag(100) a filling of the TCNQ LUMO by charge transfer from the substrate while the coadsorption of Mn leads to an energy shift of the TCNQ HOMO and LUMO of 230 meV with respect to TCNQ/Ag(001). No significant lateral band dispersion in the adsorbate layers was observed in ARPES data.