Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 22: Methods: Scanning probe techniques III

O 22.1: Vortrag

Dienstag, 23. März 2010, 10:30–10:45, H32

Scanning Probe Microscopy with a Hydrogen atom — •Jay Weymouth, Thorsten Wutscher, and Franz Giessibl — Institute for Experimental and Applied Physics, Universität Regensburg, D-93040 Regensburg, Germany

Scanning probe microscopy requires atomically sharp tips in order to image surfaces with atomic resolution. One way to increase the spatial resolution of a single-atom tip is to use a lighter atom as the front atom. While tungsten, with a covalent radius of 130 pm, is common as a tip material for SPM, it has been shown that carbon, with a covalent radius of 77 pm, can be used to probe the orbitals of a tungsten atom [Hembacher et al., Science (2004)]. Carrying on, hydrogen has the smallest covalent radius and is thus an ideal candidate for the front atom. Hydrogen has the additional benefit of passivating the tip and thus strongly decreasing reactivity, which may be beneficial for SPM tips operating in the repulsive force regime. We report on our work creating and characterizing hydrogen-terminated silicon tips.