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Many methods now exist to prepare free electrons into orbital angularmomentum states, and the predicted applications of these electron states asprobes of materials and scattering processes are numerous. The development ofelectron orbital angular momentum measurement techniques has lagged behind. Weshow that coupling between electron orbital angular momentum and a spatiallyvarying magnetic field produces an angular momentum-dependent focusing effect.We propose a design for an orbital angular momentum measurement device built onthis principle. As the method of measurement is non-interferometric, the deviceworks equally well for mixed, superposed and pure final orbital angularmomentum states. The energy and orbital angular momentum distributions ofinelastically scattered electrons may be simultaneously measurable with thistechnique.

A Stern-Gerlach-like approach to electron orbital angular momentum measurement