Norman Ramsey has recently been awarded the Nobel Prize for the ‘‘molecular beam resonance method with separated oscillating fields’’ [Phys. Rev. 78, 695–699 (1950)]. It is shown explicitly, for pedagogical purposes, how the use of rotating‐coordinate systems, introduced by Rabi etal. [Rev. Mod. Phys. 26, 167–171 (1954)] for the solution of magnetic‐resonance problems can be extended to the case of Ramsey’s method with separated oscillating fields.

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