The problem of the precession of the "spin" of a particle moving in a homogeneous electromagnetic fielda problem which has recently acquired considerable experimental interesthas already been investigated for spin -, ' particles in some particular cases. ' In the literature the results were derived by explicit use of the Dirac equation, with the occasional inclusion of a Pauli term to account for an anomalous magnetic moment. On the other hand, following a remark of Bloch' in connection with the nonrelativistic case,

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