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Chemical and Crystallographic Characterization of the Tip Apex in Scanning Probe Microscopy

Hofmann, Thomas ; Pielmeier, Florian ; Giessibl, Franz J.
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Date of publication of this fulltext: 18 Feb 2014 07:24


Abstract

The apex atom of a W scanning probe tip reveals a nonspherical charge distribution as probed by a CO molecule bonded to a Cu(111) surface [Welker et al., Science 336, 444 (2012).]. Three high-symmetry images were observed and related to three low-index crystallographic directions of the W bcc crystal. Open questions remained, such as the detectability of a contamination of W tips by sample ...

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