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O: Fachverband Oberflächenphysik

O 9: Surface Chemical Reactions and Heterogeneous Catalysis I

O 9.8: Vortrag

Montag, 31. März 2014, 12:15–12:30, PHY C 213

Combining High-Resolution Scanning Probe Microscopy Studies with Reactivity Experiments — •Stefanie Stuckenholz, Christin Büchner, Hendrik Ronneburg, Gero Thielsch, Markus Heyde, and Hans-Joachim Freund — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

We use thin metal supported MgO films as a model system to understand the correlation between morphology, electronic structure and reactivity of heterogeneous catalysts on the atomic scale.

For investigation of our samples we operate a scanning tunnelling microscope (STM) and noncontact atomic force microscope (nc-AFM). With the dual mode microscope we study the sample morphology and perform spectroscopic measurements, such as field emission resonance(FER) and Kelvin probe force microscopy (KPFM). The influence of a thin MgO film on the Mo(001) local work function, as well as differences between pristine terrace sites and line defect sites will be discussed.

To connect the findings of the dual mode microscope with reactivity studies we are setting up a new temperature programmed desorption (TPD) experiment. Here, desorption of gaseous species, e.g. CO from MgO surfaces, will be studied. This reaction serves as a model for the interaction of CO with an ionic surface.[1, 2] First results of the low temperature TPD setup will be presented.

[1] R. Wichtendahl, et al., Phys. Status Solidi A 173, 93 (1999)

[2] M. Sterrer, et al., Surf. Sci. 596, 222 (2005)