Magnetic Resonance for Nonrotating Fields

F. Bloch and A. Siegert
Phys. Rev. 57, 522 – Published 15 March 1940
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Abstract

A treatment of the magnetic resonance is given for a particle with spin ½ in a constant field H0 and under the action of an arbitrary alternating field with circular frequency ω perpendicular to H0. A method of finding a solution, valid at any time, is given which converges the better the smaller the deviations from a rotating field or the larger H0. It is shown that in the lowest order correction the shape of the resonance curve is unchanged but that it is shifted by a percentage amount H1216 H02 where H1 is the effective amplitude of the oscillating field. This also involves a correction in the values of the magnetic moments thus obtained towards smaller values which however in all practical cases is negligibly small.

  • Received 19 January 1940

DOI:https://doi.org/10.1103/PhysRev.57.522

©1940 American Physical Society

Authors & Affiliations

F. Bloch and A. Siegert*

  • Department of Physics, Stanford University, Stanford University, California

  • *Now with the Texas Company, Houston.

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Issue

Vol. 57, Iss. 6 — March 1940

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