Abstract
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 language | English |
|---|---|
| Pages (from-to) | 274-278 |
| Number of pages | 5 |
| Journal | Journal of Nuclear Materials |
| Volume | 313-316 |
| Issue number | SUPPL. |
| DOIs | |
| Publication status | Published - 2003 Mar 1 |
| Event | Plasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan Duration: 2002 May 26 → 2002 May 31 |
Keywords
- 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