Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Symposium: Size-Selected Clusters at Surfaces I
(Invited Speakers: Karl-Heinz Meiwes-Broer, Heinz Hövel, Thorsten Bernhardt)
O 12.6: Vortrag
Montag, 25. Februar 2008, 15:45–16:00, MA 005
Unoccupied states of individual silver clusters and chains 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, D-24098 Kiel, Germany
Size-selected silver clusters on Ag(111) were fabricated by single-atom manipulation using the tip of a low-temperature scanning tunneling microscope. Unoccupied electron resonances give rise to spectral features which shift towards the Fermi level with increasing cluster size. Linear assemblies exhibit higher resonance energies than equally sized compact assemblies. Density functional theory calculations reproduce the observed energies for the linear clusters and enable an assignment of the resonances to hybridized atomic 5s and 5p orbitals with silber substrate states.