Abstract
Scanning tunneling microscopy investigations of the organic material TTF-TCNQ revealed two different types of atomic structure. The first type of image is in good agreement with previously existing computer simulations. The other type is explained in terms of a novel phenomenon wherein the adsorption of a TCNQ molecule from the sample on the tip changes drastically the observed surface topography. The removal of TCNQ molecules from the surface shows possibilities for nano-indentation on a molecular level.
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