Negative ion formation at a barium surface in contact with a hydrogen plasma

van Os, C. F. A.; Heeren, R. M. A.; van Amersfoort, P. W.
November 1987
Applied Physics Letters;11/9/1987, Vol. 51 Issue 19, p1495
Academic Journal
Measurements on the production of negative hydrogen ions at a barium surface, in contact with a hydrogen plasma, are presented and discussed. In spite of the high work function of barium compared to more conventional cesiated converter surfaces, considerable yields of negative ions were produced. Conversion efficiencies up to 4% were achieved. No negative barium ions were observed.


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