Abstract
We have developed a set of working modes for scanning probemicroscopy (SPM), which generalizes the usual method of acquiringdata. We call these modes three-dimensional (3D) modes. Using thesemodes it is possible to measure typical SPM magnitudes, such as, forexample, the tunnel current, the normal force and the amplitude orfrequency of the cantilever oscillation, as a function of any othertwo magnitudes of the system: f(x1,x2). In this paper wepresent different examples of 3D modes. In particular, we haveapplied 3D modes to the study of the electrostatic interaction ofco-adsorbed single walled carbon nanotubes and individual DNAmolecules with a metallic scanning force microscopy tip. The dataindicate that adsorbed DNA has a dielectric constant similar to thatof the glass substrate.
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