Die Emission zusammengesetzter negativer Sekundärionen aus kontinuierlich regenerierten Targetoberflächen

In Ref. a method was described by use of secondary ion emission to generate wellcollimated and intense beams of heavy negative ions. In this paper the processes are studied that govern the emission of molecular ions from continuously regenerated surfaces. A rotating iron target was bombarded by noble gas ions in the energy range from 17 to 30 keV. The secondary ion yield was measured as a function of primary current density, mass and energy of the primary ions, gas pressure and the rotation frequency of the target.