Hamburg 2001 – scientific programme
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O: Oberflächenphysik
O 38: Adsorption an Oberfl
ächen (IV)
O 38.7: Talk
Friday, March 30, 2001, 12:45–13:00, C
Structural and electronic properties of a molecular wire — •Jens Kuntze1, Hao Tang2, André Gourdon2, Christian Joachim2, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik der Universität Kiel, D-24098 Kiel — 2CEMES-CNRS, F-31055 Toulouse Cedex
The structural and electronic properties of an organic molecule designed to act as a molecular wire on surfaces are characterized by scanning tunneling microscopy (STM) at 5K. The molecule adsorbs on Cu(001) in 4 different ordered domains, oriented along specific crystallographic directions. Submolecular contrast allows to distinguish between several conformations of the molecule, explaining the observed domain growth. Structural models based on calculated STM profiles are presented. Switching of single molecules between the conformations can be induced by the STM. Furthermore, it is possible to desorb single molecules from step edges in a controlled way.
Additionally, we find clear structure in the tunneling spectra of single molecules which are analyzed using elastic scattering quantum chemistry (ESQC) calculations.