Wolfram Steurer, Leo Gross, et al.
Applied Physics Letters
By functionalizing the tip of an atomic force microscope (AFM) with a molecule or an atom that significantly contributes to the tip-sample interaction, the resolution can be dramatically enhanced. The interaction and therefore the resolution crucially depend on the chemical nature of the tip termination. Employing a tip functionalized with a CO molecule, atomic resolution of a pentacene molecule was recently demonstrated. In this work, the interaction between the CO tip and the pentacene imaged are studied with first principles calculations. The calculated frequency shifts compare very well with the experiment. The different energy contributions are analyzed and the Pauli energy is computed. We demonstrate that the source of the high resolution is Pauli repulsion, whereas van der Waals and electrostatic interactions only add a diffuse attractive background. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Wolfram Steurer, Leo Gross, et al.
Applied Physics Letters
Anish Mistry, Ben Moreton, et al.
Chemistry - A European Journal
Asma Jebali, Rainer F. Mahrt, et al.
Journal of Applied Physics
Shadi Fatayer, Katharina Kaiser, et al.
S3IC 2020