Enhanced negative ion yields on diamond surfaces at elevated temperatures

P. Kumar, A. Ahmad, C. Pardanaud, M. Carrère, J.M. Layet, G. Cartry, F. Silva, A. Gicquel, R.A.H. Engeln

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Boron-doped polycrystalline diamond (BDD) and highly oriented pyrolytic graphite (HOPG) surfaces were exposed to low pressure hydrogen plasma. The relative yields of surface-produced H- ions were measured by an energy analyser quadrupole mass spectrometer. The highest H- yield was obtained at 400 °C for a BDD surface and at room temperature for an HOPG surface. At low ion bombardment energy, the maximum yield on a BDD surface is about 5 times higher than that on an HOPG surface, which has been the best carbon material so far for surface production of H- ions in caesium-free plasma. Raman measurements revealed surface modifications after plasma exposure.
Original languageEnglish
Article number372002
Pages (from-to)372002-1/4
JournalJournal of Physics D: Applied Physics
Issue number37
Publication statusPublished - 2011


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