Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 38: Adsorption V
O 38.4: Vortrag
Donnerstag, 30. März 2006, 15:45–16:00, TRE Phys
Absorption of π-conjugated molecules on Cu(111) studied by X-ray standing waves — •A. Gerlach1, S. Sellner1,2, F. Schreiber1, N. Koch3, T.-L. Lee4, and J. Zegenhagen4 — 1Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany — 2Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany — 3Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 4ESRF, Rue Jules Horowitz, B.P. 220, 38043 Grenoble Cedex 9, France
We study the adsorption of different aromatic molecules such as phthalocyanines and perylene derivatives on Cu(111) using the X-ray standing wave (XSW) technique. Element specific structural information of high precision is derived from the analysis of XSW yield measurements. Using the C(1s), N(1s), and F(1s) photoelectron signals we show that the molecules adsorb in a lying-down configuration, but with different distances relative to the metal substrate.
The binding distances between the aromatic ring structure and the metal substrate is generally found to be larger than covalent bond lengths. Furthermore, we discuss more subtle effects as e.g. deformations of the adsorbed molecules that are related to the charge (re)distribution at the interface.
[1] A. Gerlach, F. Schreiber, S. Sellner, H. Dosch, I. A. Vartanyants, B. C. C. Cowie, T.-L. Lee, J. Zegenhagen, Phys. Rev. B 71 (2005) 205425
[2] M. Preuss, W. G. Schmidt, and F. Bechstedt, Phys. Rev. Lett. 94, 236102 (2005)