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Simple models of the quantum efficiency (QE) and emittance (εn,rms) of metals are based on the neglect of scattered electrons to the emission current. The leading order terms in the Fowler-Dubridge equation for QE and the Dowell-Schmerge equation for emittance entail QE∝εn4. Here, a method to account for next-order contributions and the impact of scattered electrons to the relation is given.
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Kevin L. Jensen (2013) studied this question.
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