Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 54: Adsorption an Oberfl
ächen VI

O 54.4: Talk

Wednesday, March 9, 2005, 11:30–11:45, TU EB202

Adsorption-Induced Distortion of F₁₆CuPc on Cu(111) and Ag(111): An X-ray standing wave study — •A. Gerlach¹, F. Schreiber¹, S. Sellner^2,3, H. Dosch^2,3, I. A. Vartanyants⁴, B. C. C. Cowie⁵, T.-L. Lee⁵, and J. Zegenhagen⁵ — ¹Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, OX1 3QZ, United Kingdom — ²Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany — ³ITAP, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — ⁴HASYLAB, DESY, Notkestr. 85, 22607 Hamburg, Germany — ⁵ESRF, 6 Rue Jules Horowitz, B.P. 220, 38043 Grenoble Cedex 9, France

The adsorption geometry of perfluorinated copper-phthalocyanine molecules (F₁₆CuPc) on Cu(111) and Ag(111) is studied using X-ray standing waves. A detailed, element-specific analysis taking into account non-dipolar corrections to the photoelectron yield shows that the molecules adsorb in a lying down configuration, but with a significant distortion of the molecule on both surfaces. While on copper (silver) the central carbon rings reside 2.61 Å (3.25 Å) above the substrate, the outer fluorine atoms are located 0.27 Å (0.20 Å) further away from the surface. We propose that the outer carbon atoms in F₁₆CuPc undergo a rehybridization (sp² → sp³) which results in a non-planar adsorption.