Abstract
The possibility for realizing a recombination laser with hydrogenic helium ions pumped by an intense proton beam is investigated. He2+ ions are produced by proton pulses of 50 ns length, 200 keV kinetic energy and a current density of 100 A/cm2. The fluorescence intensities of the 4→3 and the 3→2 transitions in He+ are readily reproduced by a kinetic model for the recombination. Optical gain for the 3→2 transition at 164 nm was not observed, since radiation trapping prohibits the depopulation of the lower level.
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