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Clean metal as well as C 60 -terminated tips of an atomic force microscope probe the interaction with C 60  molecules adsorbed on Cu(111) and Pb(111). The force measurements unveil a monotonic shift of the point of maximum attraction with the bias voltage. The conventional superposition of long-range van der Waals and electrostatic forces with short-range Pauli repulsion does not reproduce the shift. By phenomenologically including bias-dependent relaxations of the electrode geometry in the analytical expression for the short-range force the experimental data can qualitatively be described.

Probing relaxations of atomic-scale junctions in the Pauli repulsion range