Electron stimulated desorption ions of hydrogen and deuterium molecules in extremely high vacuum

M. Takizawa, A. Yoshimi, T. Katunuma, T. Yabe, C. Oshima

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

By using an ionization gauge with a large-angle ion deflector, we have measured electron stimulated desorption (ESD) ions emitted from the grid in extremely high vacuum. Combination of energy analysis with mass analysis makes it possible to detect molecular species of ESD ions and gas-phase ions separately. The observed ESD ions in this experiment originate from a small amount of adsorbates, ∼ 10-5 monolayer. The behavior of ESD' ions of hydrogen and deuterium has been observed by introducing the deuterium (D2) gas at 1.9 × 10-9 Pa. The D2 + ions have been detected in the ESD mass spectra, but no peak has appeared at mass number 3 (HD). The energy of the D2 ESD ions is the same as that of H2 ions, which is slightly higher than that of H ESD ions. Time dependence of the ESD intensity indicates the existence of several chemisorption sites of H2 and/or D2 molecules at room temperature.

Original languageEnglish
Pages (from-to)571-573
Number of pages3
JournalVacuum
Volume47
Issue number6-8
Publication statusPublished - 1996 Jun

Keywords

  • Deuterium
  • ESD
  • Hydrogen
  • Platinum
  • XHV

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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    Takizawa, M., Yoshimi, A., Katunuma, T., Yabe, T., & Oshima, C. (1996). Electron stimulated desorption ions of hydrogen and deuterium molecules in extremely high vacuum. Vacuum, 47(6-8), 571-573.