Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.11: Poster
Montag, 25. Februar 2008, 18:30–19:30, Poster F
Spatially resolved bonding and antibonding states on a silver dimer on Ag(111) — •Alexander Sperl1, Jörg Kröger1, Nicolas Neél1, Henning Jensen1, Richard Berndt1, Andreas Franke2, and Eckhard Pehlke2 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — 2Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
Individual silver dimers were fabricated by single-atom manipulation using the tip of a low-temperature scanning tunneling microscope. Combining spatially resolved scanning tunneling spectroscopy of the dimer with density functional theory calculations bonding and antibonding electron states are identified. While bonding states contribute to the local density of states mainly in the center of the dimer, antibonding states are localized at the atom sites. The evolution of monomer to dimer unoccupied resonances was monitored as a function of decreasing mutual silver atom distance and found to shift toward the Fermi level.