Abstract
It is shown that due to different positions of the ground level and affinity level of a target atom relative to the Fermi level for both positive and negative secondary particles, emitted during ion bombardment from pure metals, the known electron-exchange theory of the secondary positive ion emission for pure metals is inapplicable in the case of negative ion formation. Also, the corresponding electron-exchange theory for such metals covered by electropositive films turns out to be inapplicable. A model of the secondary negative ion emission, caused by radiation effects on the surface of those metals, arising during ion bombardment, is presented.
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