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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)

O 58.45: Poster

Mittwoch, 28. März 2012, 18:15–21:45, Poster B

Adsorption of CO on Rh_N/Ru(0001) Films — •Sebastian Thussing, Pawel Gazdzicki, and Peter Jakob — Fachbereich Physik, Philipps-Universität Marburg, 35032 Marburg, Germany

The growth of thin (≤ 3 ML) Rh/Ru(0001) films and the adsorption of CO on these films have been investigated in the temperature range 85 − 1350 K using IRAS, TPD, and LEED. Specifically, the shifts of the CO stretching vibration due to lateral interactions, lattice strain and influence by the substrate were investigated. Furthermore, the dependence of CO adsorption energies and coverages on the Rh-film thickness were explored. A minimum in CO desorption energy was thereby found for the first Rh monolayer. For these layers four distinct long-range ordered phases of CO, with characteristic occupation of the various CO adsorption sites, have been observed. Based on our ability to discriminate the various CO species according to their local binding geometry, morphological changes in the island size distribution (ranging from single Rh atoms to extended Rh islands and Rh/Ru surface alloys) have been analyzed. The findings are discussed in the context of recent work on Pt_N/Ru(0001) layers [1, 2].

[1] Schlapka, A. and Lischka, M. and Groß, A. and Käsberger, U. and Jakob, P., Phys. Rev. Lett. 91, 016101 (2003).

[2] Jakob, P. and Schlapka, A., Surf. Sci. 601, 3556 (2007).