Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 78: Poster Session - Focus Session: Functional Molecules at Surfaces - Motion and Intramolecular Processes

O 78.2: Poster

Wednesday, March 18, 2020, 18:15–20:00, P2/EG

Fast one-dimensional motion of single molecules on a metal surface — •Donato Civita, Grant J. Simpson, and Leonhard Grill — Department of Physical Chemistry, University of Graz, Austria

Molecular motion on crystalline surfaces is of great importance to understand fundamental physical and chemical properties as well as in the field of heterogeneous catalysis. We studied the lateral motion of molecules over a Ag(111) surface by scanning tunnelling microscopy (STM). Single molecules are observed in a stable adsorption orientation, but by manipulating the molecules with the STM tip they can be reoriented into an orientation where they move much more easily. This behaviour will be discussed in terms of incommensurability, which creates a low diffusion barrier, and molecule composition as we have compared different molecules. It turns out that the implementation of halogen atoms surprisingly does not alter the effect of the fast motion, but increases the adsorption energy and stability of the molecule in one orientation and consequently the one-dimensionality of the motion.