Magnetic field effects resonance frequencies

In cyclotron resonance, a metallic or semiconductor sample is mounted in a microwave cavity and illuminated by a light beam shining through a hole in the cavity wall. Modulation of the light beam produces modulation of the free-carrier concentration. The carriers spiral around an applied dc magnetic field, satisfying resonance conditions when the microwave frequency a> = eH/m c and yielding the effective mass of the carriers m. ... 

The observed resonance frequency of any NMR-active nucleus depends in a characteristic manner upon the magnetic environment of that nucleus. The effective field strength (5eff) felt by the nucleus of an atom that has magnetic moment differs from the imposed field (B0) in the following manner (eq. 2.1)... 

In Chapter 2, ENDOR (electron-nuclear double resonance) was briefly described. To perform an ENDOR experiment it is necessary to apply both a radiofrequency and a microwave frequency, effectively performing simultaneous NMR and ESR, respectively, on the sample. The experiment is performed at a fixed magnetic field, with the ESR saturating frequency centered on a... 

The y-facior. The 0-factor takes into account the fact that the local magnetic field experienced by a particular atom in a molecule may not be the same as the applied field owing to the existence of local field effects. In the absence of such effects, g for any particular radical would simply have the same value as that of the free electron, 2.0023, and all radicals would come into resonance at the same applied field for a given microwave frequency. We can thus express the resonance condition (equation 2.173) as ... 

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