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We have measured total electron-emission yields {γ} for clean tungsten bombarded with various multiply charged ions: Zq+ up to N⁶⁺, Ne⁷⁺, Ar¹²⁺, and Kr¹¹⁺. At low impact energy ({≤}10 eV/amu) a linear dependence of {γ} versus ion potential energy could be observed up to the respectively highest q, for which a pronounced decrease appeared superimposed on the gradual decrease of all {γ} toward higher impact energy. Our results are discussed within a multiple-step ion-neutralization model.
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Delaunay et al. (1987) studied this question.
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