Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 57: Surface dynamics II

O 57.2: Talk

Wednesday, March 24, 2010, 15:15–15:30, H40

Dependence of thermal CO diffusion on Cu(111) on local coverage — •Christopher Zaum, Kastur Meyer-auf-der-Heide, and Karina Morgenstern — Institut für Festkörperphysik, Abteilung ATMOS, Gottfried Wilhelm Leibniz Universität, Appelstr. 2, D-30167 Hannover, Germany

Because of its importance as reactant in several catalytic reactions, carbon monoxide is often used in exemplary surface science studies. In order to investigate the diffusion of this molecule, we deposited CO molecules on a clean Cu(111) surface held at 22K and recorded several image series for dynamic analysis in a temperature range from 40K to 60K with a low-temperature scanning tunneling microscope. The diffusion of single CO molecules at low local coverages follows an Arrhenius law. At higher local coverages next-neighbor interactions influence the diffusion by increasing the local diffusion rates. We will discuss quantitatively the dependence of the diffusivity of single CO molecules on their local environment.