Monochromatic field electron emission from a Nb superconductor

Chuhei Oshima

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To observe a monochromatic electron beam with energy width much narrower than that of a conventional electron beam, we have constructed an apparatus consisting of a low-temperature field-emission electron gun cooled to 4.2 K and a high-resolution electron spectrometer operating at high vacuum. With this system, we have observed spectra of the field electron emission from a niobium superconducting emitter. After tip cleaning by repeated treatments of field evaporation in vacuum less than 10-10 Pa, we have detected a sharp peak at the Fermi level in the spectra with an energy width of ~ 20 meV at 10 nA.

Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalUltramicroscopy
Volume78
Issue number1-4
DOIs
Publication statusPublished - 1999 Jun

Keywords

  • Field emission
  • Monochromatic beam
  • Superconductor

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation

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