High-efficiency secondary electron emission due to incident ions was obtained from a porous MgO-Ag layer prepared from a suspension of MgO, MgCO3 powder, and Ag paste. Field-dependent secondary emission yield larger than unity was achieved under relatively low-energy ion bombardment. The introduction of Ag produces a uniform surface potential and therefore results in a stable secondary emission current. This type of emitter is potentially useful for application in gas-discharge devices.
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Koshida et al. (1978) studied this question.
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