
Negative helium ions have been produced with an ion source previously used for negative hydrogen ion production. Positive helium ions pass through a charge-exchange tube filled with hydrogen gas and the resulting negative ions are magnetically analyzed. The momentum spectrum indicates peak yields of negative helium ions in excess of 3.5 x 10/sup -9/ ampere under the conditions of this experiment. The yield of negative helium ions as a function of converter gas density suggests a possible mechanism for the creation of the negative helium ion. (auth)
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