Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 2: Scanning probe techniques: Method development I

O 2.7: Vortrag

Montag, 12. März 2018, 12:00–12:15, MA 004

Analysis of the image contrast on Cu(111) using low temperature atomic force microscopy with CO functionalized tips — •Jalmar Tschakert¹, Jannis Jung², Tobias Schlöder², Olena Lenchuk², Doreen Mollenhauer², Andre Schirmeisen¹, and Daniel Ebeling¹ — ¹Insitute of Applied Physics, Justus-Liebig-University Giessen, Germany — ²Insitute of Physical Chemistry, Justus-Liebig-University Giessen, Germany

Low temperature atomic force microscopy with CO-functionalized tips allows to image surfaces and single adsorbed molecules with atomic resolution. Therefore, this so-called bond imaging technique is particularly interesting for studying on-surface catalytic reactions, since it allows to determine molecular adsorption geometries and specific adsorption sites. However, due to the flexibility of the CO tip and different types of short range interactions between the CO tip and the imaged atoms the resulting image contrast is rather complex. When imaging a flat Cu(111) surface this leads to contrast inversions for certain tip-sample distances, which makes it difficult to unambiguously identify atomic sites. To unravel the mechanism behind the contrast formation on Cu(111) we are performing 3D force-field spectroscopy measurements. Therewith, we are able to determine the lateral movement/tilting of the CO molecule and unambiguously identify different atomic sites.