Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Scanning probe methods)

O 35.1: Poster

Tuesday, March 15, 2011, 18:30–22:00, P3

Measurement of the interactions between two molecules with NC-AFM — •Martina Corso, Christian Lotze, and Jose Ignacio Pascual — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Non-contact atomic force microscopy (NC-AFM), operated in frequency modulation mode, has been recently the subject of extraordinary advances. One of its most striking achievement resides on its capability to resolve the chemical structure of molecules with unprecedented atomic resolution [1]. Such measurements are possible by detecting short-range bonding interactions between the foremost atom of a tip at the end of a cantilever and the atoms at the surface. In order to minimize contributions from van der Waals and electrostatic interactions, sharp STM tips are used. With our STM/AFM based in a qPlus sensor design operated at 5K we use CO modified STM tips to quantify the forces involved during imaging and manipulation of small (as CO) and large molecules (as DPBP) adsorbed on a Cu(111) surface. In particular we investigate with force spectroscopy site specific interactions between a CO-tip and C₂H₂ molecules. Short-range interaction force curves suggest that a local bond between two species might be formed. [1] L. Gross, F. Mohn, N. Moll, P. Liljeroth, G. Meyer, Science 325, 1110 (2009).