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Electrostatic electron energy analysis in a strong magnetic field using conventional retarding-field methods may be inaccurate, because these devices discriminate against parallel momentum and not total energy. We show how a magnetic-field minimum at the point of minmum potential can remove this difficulty. Examples of elastic and inelastic electron–atom scattering, and of electron energy loss in a plasma, are given.
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Hsu et al. (1976) studied this question.
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