Demountable single-atom electron source

Chuhei Oshima, Eiji Rokuta, Takahiro Itagaki, Tsuyosi Ishikawa, Bokurai Cho, Hong Shi Kuo, Ing Shouh Hwang, Tien T. Tsong

Research output: Contribution to journalArticle

17 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)412-416
Number of pages5
Journale-Journal of Surface Science and Nanotechnology
Publication statusPublished - 2005 Dec 9


  • Coherent beam
  • Demountable source
  • High brightness
  • Single-atom source

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Materials Science (miscellaneous)

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  • Cite this

    Oshima, C., Rokuta, E., Itagaki, T., Ishikawa, T., Cho, B., Kuo, H. S., Hwang, I. S., & Tsong, T. T. (2005). Demountable single-atom electron source. e-Journal of Surface Science and Nanotechnology, 3, 412-416.