Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 52: Elektronische Struktur IV
O 52.9: Vortrag
Mittwoch, 9. März 2005, 12:45–13:00, TU EB301
Molecular orbital shift of PTCDA on Au(111) and Au(788) — •Henning Jensen1, Jörg Kröger1, Riccardo Rurali2, Nicolás Lorente2, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität Kiel, D-24098 Kiel, Germany — 2Laboratoire Collisions - Agrégats - Réactivité, Université de Toulouse, F-31062 Toulouse, France
Scanning tunnelling microscopy of 3,4,9,10-perylenetetracarboxylic-dianhydride adsorbed on Au(111) and Au(788) reveals two coexisting superstructures with different coordination numbers. Using single-molecule tunnelling spectroscopy we find that the energy of the second-to-lowest unoccupied molecular orbital varies significantly with coordination geometry. Theoretical modelling attributes this variation to a dipole moment induced by deformation of the molecular plane.