Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Surface Dynamics: Reactions and Elementary Processes
O 73.12: Poster
Mittwoch, 9. März 2016, 18:15–20:30, Poster A
Adsorption and diffusion of cobalt phthalocyanine molecules on the Ag(100) surface — Grazyna Antczak1, •Wojciech Kamiński1, Agata Sabik1, Christopher Zaum2, and Karina Morgenstern3 — 1Institute of Experimental Physics, University of Wrocław, Wrocław, Poland — 2Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover, Germany — 3Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, Bochum, Germany
Surface diffusion is essential to many technological processes, such as crystal growth, catalysis, sintering, etc. It influences the stability of functional and technologically important materials. The surface diffusion of adatoms on surfaces has been already widely investigated, but it is still the remaining challenge to probe and fully understand the motion of bigger objects, such as organic molecules.
We investigate the geometry, the electronic structure, and the diffusion mechanism of CoPc molecules adsorbed on the Ag(100). The measurements were performed using the LT-STM and supported with the DFT calculations. We demonstrate that the complex surface diffusion mechanism of CoPc molecules involves, in the same temperature range, a combined translational and rotational molecular motion. Both processes are associated with similar activation energies; however, the translation is more frequently observed. Two channels for surface diffusion were identified: the first provides only a channel for translation, while the second couples the translational and the rotational molecular motion on the transition path. The existence of the two channels explains a higher rate for the translation determined in experiment.