Abstract
We report on the secondary ion emission from Ni(111) covered with one monolayer of CO. The ion emission was induced by bombardment with singly and doubly charged Ne and Kr ions (impact energy 20–500 eV). At low impact energies (< 200 eV), Ne 2+ or Kr 2+ caused a significantly higher Ni + secondary ion yield than Ne + and Kr + respectively. A mechanism for this charge-depen-dent secondary ion formation at low impact energy is discussed.
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