An electron monochromator for use in an axial magnetic field is described. Electrons are injected parallel to the magnetic field and an electric field is applied in a perpendicular direction. The electrons thus describe trochoids and drift in a direction perpendicular to both the electric and magnetic fields and disperse according to their initial velocities. An electron energy width at half-maximum of 0.020 eV can be obtained, with a transmitted current of about 10−9 A.
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Stamatović et al. (1970) studied this question.
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