e-Journal of Surface Science and Nanotechnology
Online ISSN : 1348-0391
Conference -ISSS-4-
Demountable Single-Atom Electron Source
Chuhei OshimaEiji RokutaTakahiro ItagakiTsuyosi IshikawaBokurai ChoHong-Shi KuoIng-Shouh HwangTien T. Tsong
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2005 Volume 3 Pages 412-416


We report emission properties of single-atom tips, noble electron sources terminated with a single atom. The repairing function of the sources, which had been already demonstrated by using field ion microscope [Fu, et al. Phys. Rev. B 64, 113401 (2001)], was confirmed by using field emission microscopy, and in addition, the demountable character was demonstrated repeatedly. The brightness of the collimated beam emitted from the single-atom tips was estimated to be an order of 1010 A/cm2/str. (E ∼ 2 keV), which is two orders of magnitude higher than those of the conventional field emission sources. There appeared an extra shoulder in the energy spectra, which is strongly correlated with a single-atom ended structure. The fluctuation of the emission current exhibited step- and spike-like noises, which were typical features of nano-electron sources. The single-atom sources are promising candidates of the electron sources in high-performance electron-beam instruments. [DOI: 10.1380/ejssnt.2005.412]

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