Fluctuations of field emission currents under extreme high vacuum

B. Cho*, T. Ishikawa, C. Oshima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report the result of the noise measurement using an extreme high vacuum field emission microscope (XHV-FEM) operating under ̃ 7 × 10 -10 Pa. The fluctuation of a field emission (FE) current for a clean W(111) tip was comparable to the corresponding shot noise fluctuation, demonstrating the suitability of the XHV-FEM for investigation on the inherent fluctuation behavior of the FE process. Semilogarithmic damping curves of FE currents were linear for more than 10 hours. The noise of field emission (FE) currents ranging from 10 pA to 100 μA was measured under ̃ 7 × 10-10 Pa. The lowest frequency measurement of shot noise was recorded at below 10 Hz.

Original languageEnglish
Pages (from-to)64-67
Number of pages4
Journale-Journal of Surface Science and Nanotechnology
Publication statusPublished - 2008 Feb 19


  • Field emission
  • Field emission Microscopy
  • Fluctuation

ASJC Scopus subject areas

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


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