Re-emission of hydrogen implanted into graphite by helium ion bombardment

B. Tsuchiya, K. Morita, S. Yamamoto, Shinji Nagata, N. Ohtsu, T. Shikama, H. Naramoto

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Helium ion-induced re-emission of hydrogen implanted in graphite with 5 keV H2+ ion beam at room temperature has been investigated in the energy range from 60 to 200 keV, by means of a high energy elastic recoil detection method with 16 MeV O5+ ion beam. The hydrogen concentrations in graphite rapidly decrease with increasing the He+ ion fluence and reach a constant value of H/C ≅ 0.2. The re-emission rates of hydrogen from graphite increase with decreasing incident energy of the He+ ion. The He+ ion-induced detrapping cross-sections have been evaluated by analyzing the experimental data with mass balance equations including elementary processes such as detrapping, trapping and local molecular re-combination between an activated hydrogen atom and a trapped one. The elastic displacement collisions with energetic carbon recoils produced by He+ ion bombardments are dominant for the detrapping of hydrogen in the range of the incident energies.

Original languageEnglish
Pages (from-to)274-278
Number of pages5
JournalJournal of Nuclear Materials
Issue numberSUPPL.
Publication statusPublished - 2003 Mar 1
EventPlasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan
Duration: 2002 May 262002 May 31


  • De-trapping cross-section
  • Helium ion bombardment
  • Hydrogen
  • Ion-induced re-emission
  • Mass balance equation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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