Secondary electron multiplier
From Mass Spec Terms
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Orange Book Entry
A device to multiply current in an electron beam (or in a photon or particle beam by first converting them to electrons) by incidence of accelerated electrons upon a surface of an electrode which yields a number of secondary electrons greater than the number of incident electrons. These electrons are then accelerated to another electrode (or another part of it), which in turn emits further seondary electrons so that the process can be repeated.
