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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.24: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Infrared Reflection Absorption Spectroscopy (IRRAS) of Ethene (C2H4) Chemisorbed on the Bare and Roughened Cu(110) and Cu(111) Surfaces — •Jan Pischel, Olaf Skibbe, and Annemarie Pucci — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, D-69120 Heidelberg
As a model for an organic-metal interface, the chemisorption systems C2H4/Cu(111) and C2H4/Cu(110) have attracted attention because of their remarkable absorption properties in infrared (IR) spectroscopy [1-4]. Not only were two gas phase Raman active modes observed that are expected to be IR forbidden by the Raman-IR exclusion principle for centrosymmetric molecules, but also the only IR active mode allowed by the metal surface selection rule seemed to disappear at higher coverages on Cu(110). No final conclusion concerning these findings has been drawn so far. This brought us to reinvestigate the system C2H4/Cu(110) by means of IRRAS. Additionally the influence of small amounts of cold-evaporated copper in the submonolayer region has been studied. The results are compared to those of ethene adsorbed on Cu(111) [4]: While the spectra obtained on the bare surfaces are found to differ strongly, the absorption properties become similar with increasing surface roughness.
[1] C. J. Jenks et al. Surf. Sci. Lett., 277:L89-L94, 1992.
[2] J. Kubota et al. Phys. Chem., 98:7653-7656, 1994.
[3] R. Raval. Surf. Sci., 331-333:1-10, 1995.
[4] O. Skibbe et al. J. Chem. Phys., 128:194703-1 - 194703-6, 2008.