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We present a quantum mechanical treatment of particle beam magnetic resonance and related experiments, in terms of static plane waves, applicable to experiments with oscillating fields. The results yield an alternate view of Larmor precession, showing it as a beating between different waves, and help to shed new light on several aspects of the problems discussed. We discuss magnetic resonance experiments with both the Rabi and Ramsey methods, neutron resonance spin echo and a neutron interferometer experiment.