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O: Oberflächenphysik

O 36: Poster (II)

O 36.66: Poster

Donnerstag, 25. März 1999, 20:00–22:30, Zelt

Forces and Dissipation in Dynamic Force Microscopy of Heterogeneous Surfaces — •Roland Bennewitz, Martin Bammerlin, Viola Barwich, Martin Guggisberg, Christian Loppacher, Alexis Baratoff, Ernst Meyer, and H.-J. Güntherodt — Institute of Physics and Astronomy, University of Basel, Klingelbergstr. 82, CH-4056 Basel

Ultrathin films of NaCl on Cu(111) have been studied using a

Dynamic Force Microscope. Force spectroscopy measurements of the

tip-sample interaction on NaCl and Cu are analyzed with respect

to electrostatic, van der Waals, and short-range contributions.

The interaction contrast between NaCl and Cu is shown to be

reflected in the oscillation characteristics of the cantilever.

Results of a resonance analysis with help of a new digital

oscillation control system are presented.