Josh Y Mutus, Radovan Urban, Jason Pitters, Lucian Livadaru, Peter A. Legg, Robert A. Wolkow
This work demonstrates the fabrication of a single atom tip electron source with exceptionally high spatial coherence. A coherence angle of 14.3 +/- 0.5 degrees was measured, indicating a virtual source size of 1.7 +/- 0.6 {\AA}. The nanotips under study were crafted using a spatially-confined, field-assisted nitrogen etch, which removes material from the periphery of the tip apex, resulting in a sharp, tungsten-nitride stabilized, high-aspect ratio source. The coherence properties are measured in a low-energy electron point source microscope with a carbon nanotube bundle acting as a bi-prism. This work represents a marked improvement in spatial coherence of electron sources.
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http://arxiv.org/abs/1208.2994
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