Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.55: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Substrate-induced molecular orientation of ClGa-phthalocya-nine studied by MAES and UPS — •T. Hosokai1, A. Gerlach1, H. Machida2, Y. Suzuki2, S. Duhm2, N. Koch3, S. Kera2, U. Nobuo2, and F. Schreiber1 — 1Institut für Angewandte Physik, Universität Tübingen, Germany — 2Graduate School of Advanced Integration Science, Chiba university, Japan — 3Institut für Physik, Humboldt-Universität zu Berlin, Germany
Understanding the substrate-molecule interactions is a prerequisite for the control of organic film growth. Here we report the substrate-induced molecular orientation of the non-planar chlorogallium phthalocyanine (ClGaPc) molecules on Cu(111) and graphite by means of UPS and metastable atom electron spectroscopy (MAES). In the monolayer MAES shows distinctively different features on Cu(111) and graphite: On the Cu(111) surface bands corresponding to non-bonding orbitals of the Cl-atom, i.e. those largely distributed parallel and perpendicular to the molecular plane, are not observed, whereas on the graphite both bands can be found. Because of the high surface sensitivity of the MAES technique these results indicate a different orientation of ClGaPc on Cu(111) and graphite. On Cu(111) ClGaPc molecules orient with the Cl-atom directed towards the Cu surface, whereas on the graphite ClGaPc molecules orient with the Cl-atom directed towards the vacuum. Although it is often found that Pc molecules orient to maximize the overlap with the substrate electrons, we show that the central atoms also play a role for the orientation of polar Pc molecules on different substrates.