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O: Fachverband Oberflächenphysik

O 14: Metal Substrates: Epitaxy and Growth

O 14.12: Talk

Monday, March 26, 2007, 17:00–17:15, H39

Adsorption geometry and electronic properties of Ag(111)-Cs studied by scanning tunnelling microscopy and spectroscopy — •Martin Ziegler, Jörg Kröger, and Richard Berndt — Institut für Experimentelle und Angewandte Physik der Universität Kiel

A scanning tunnelling microscope operated in ultra-high vacuum and at low temperatures is used to study superstructures of ultrathin Cs films on Ag(111) at various coverages. Hexagonally ordered adsorption domains which are rotated with respect to each other are observed. Mutual Cs atom distances are discussed in terms of surface state-mediated interactions. Electronic properties of the different Cs adsorption layers are investigated by tunnelling spectroscopy. Quantum well states as well as a modified Ag(111) surface state are present.