Abstract
The yield of H − ions produced by the impact of 440 keV hydrogen cluster-ions on a cesium-covered W(110) surface at an incidence angle of 45° has been measured as a function of the kinetic energy per atom in the incoming cluster ions. The average yield is found to have a maximum of about 4% at 36 eV per atom. The H − formation is practically limited to the energy range of 5 to 100 eV per atom.
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