Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 9: Adsorption an Oberfl
ächen I
O 9.12: Vortrag
Montag, 24. März 2003, 17:45–18:00, FOE/ANOR
Investigation of Oxygen induced Reconstructions on Cu(110) — •M. Hohage1, L. D. Sun1, S. H. Kim1, P. Zeppenfeld1 und RE. Balderas-Navarro2 — 1Institute of Experimental Physics, Johannes Kepler University Linz, A-4040 Linz, Austria — 2Facultad de Ciencias and IICO, Universidad Autonoma de San Luis Potosi, San Luis Potosi, SLP 78000, Mexico
We present a Reflectance Difference Spectroscopy (RDS) investigation of the adsorption and growth of oxygen on Cu(110). RDS measures the anisotropy of the optical reflectivity at normal incidence. In the case of fcc crystals like Cu the isotropic bulk has no contribution to the signal. Only symmetry breaking surfaces generate an optical anisotropy and thus an RDS response. The anisotropy signal of Cu(110) is strongly altered by the adsorption of oxygen. Interestingly, the RDS-Signal depends not only on the oxygen coverage, but is also extremely sensitive to the arrangement of the oxygen within the layer. The oxygen induced p(2x1) and c(6x2) reconstructions are characterized by RDS. Additionally, the coverage dependent transition between these reconstructions can be monitored. The RDS results can be correlated directly to data obtained with standard surface analytical tools like STM, AES and LEED.