Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 15: Metal Substrates II: Adsorption and Reactivity

O 15.7: Talk

Monday, April 1, 2019, 16:30–16:45, Kunsthalle

Frequency modulation atomic force microscopy and scanning tunneling microscopy study of CO on Pt(111) — •Oliver Gretz, Franz J. Giessibl, and Alfred J. Weymouth — Universität Regensburg, Regensburg, Deutschland

Small molecules, like CO, have a higher binding energy to platinum than to other metals like copper. When comparing CO on Pt(111) to CO on Cu(111), the frustrated translational mode is 2 meV (about 50%) higher and individual CO molecules appear in low-bias STM images as protrusions instead of as depressions. In this talk we present our AFM/STM studies of CO on Pt(111). Previously, CO on Cu(111) has been used to image the apex of an AFM tip (CO-Front atom Identification - COFI). As the lateral stiffness of adsorbed CO scales by the square of the energy of the frustrated translational mode, we expect less abberations due to CO bending than on Cu(111). We performed COFI measurements with CO on Pt(111). In addition, we performed manipulation experiments and measured the lateral force to move a CO molecule from one adsorption site to another.