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O: Fachverband Oberflächenphysik

O 105: Scanning Probe Techniques II: Method Development (joint session O/CPP)

O 105.1: Vortrag

Donnerstag, 19. März 2020, 10:30–10:45, WIL C107

Identifying the atomic configuration of the tip apex using STM and FM-AFM with CO on Pt(111) — •Oliver Gretz, Alfred J. Weymouth, and Franz. J. Giessibl — Institute of Experimental and Applied Physics, Department of Physics, University of Regensburg, 93053 Regensburg

We investigated individual CO molecules adsorbed on Pt(111) with a metal tip using scanning tunneling microscopy (STM) and frequency-modulation atomic force microscopy (FM-AFM). When tips terminate in multiple atoms, the individual atoms are visible not only in the FM-AFM image but also in the raw STM image. This is in contrast to CO on Cu(111), where individual atoms cannot be identified in the raw STM image [J. Welker and F. J. Giessibl, Science 336, 444 (2012)]. We consider the mechanisms behind the higher spatial resolution on Pt, and rule out the increase stiffness of the adsorbed CO, concluding that CO bending does not strongly affect the STM image on either Cu or Pt.