Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 15: STM/AFM: New Approaches

O 15.9: Vortrag

Montag, 7. März 2016, 17:15–17:30, H24

Extending carbon monoxide front atom identification (COFI) to probe the second atomic layer of an AFM tip — •Daniel Meuer, Andreas Bartholomäus Kelbel, and Franz Josef Giessibl — Universität Regensburg, Germany

The structural details of the tip determine the spatial resolution and the contrast which is obtained in atomic force microscopy. Welker and Giessibl demonstrated, that a CO molecule on a Cu(111) surface can characterize the foremost atomic layer of the apex of a metallic tip [1]. A detailed knowledge of the second atomic layer of the tip would allow even more insights into the tip structure.

In COFI, the upright bonded CO molecule on, e.g. Cu(111) probes the front atoms of the tip. We present a new technique where we put a CO on a Cu adatom essentially lengthening the CO molecule to a CuCO molecule. Then we trace the tip along a bell shaped curve to be closer to the second layer atoms next to the front most atoms. This method, which we call CuCOFI, allows us to characterize even the second atomic layer of the tip apex in situ by AFM.

References: [1] J. Welker and F. J. Giessibl, Science 336, 444 (2012)