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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.20: Poster
Wednesday, March 28, 2012, 18:15–21:45, Poster B
Chemisorptive bonding of Pyrenetetraone on Cu(111) and Ag(111) measured with XSW — •Christoph Bürker1, Jens Niederhausen2, Steffen Duhm3, Takuya Hosokai4, Jörg Zegenhagen5, Ralph Rieger6, Joachim Räder6, Klaus Müllen6, Alexander Gerlach1, Norbert Koch2, and Frank Schreiber1 — 1Universität Tübingen, Germany — 2Humboldt-Universität zu Berlin, Germany — 3Chiba University, Japan — 4Iwate University, Japan — 5ESRF, France — 6Max-Planck-Institut für Polymerforschung Mainz, Germany
The X-ray Standing Wave (XSW) technique [1] is a high precision method to obtain the vertical bonding distance for each chemical element of the molecule. In recent years it was shown that the bonding distance may be dependent on the substrate and correlated with the interaction strength [2].
We present the adsorption geometry of PYTON (4,5,9,10-Pyrenetetraone, C16H6O4) on Cu(111) and Ag(111). Our results show a significant bending of the oxygen atoms towards the substrate, both for Cu(111) and for Ag(111). Furthermore, for both metals the bonding distance of PYTON is relatively small, indicating a strongly interacting, chemisorbed system with a possible charge transfer between PYTON and substrate. Comparing these results with PTCDA (C24H8O6) adsorbed on the same metals [2,3] we see a stronger and almost substrate independent interaction of PYTON with Cu(111) and Ag(111). [1] J. Zegenhagen, Surf. Sci. Rep. 18 (1993),199 [2] S. Duhm et al., Org. Electr. 9 (2008),111 [3] A. Gerlach et al., Phys. Rev. B 75 (2007)