In this experiment the gyromagnetic ratio of a sample of very pure iron was determined. The sample was wound with a magnetizing coil and supported as a torsional pendulum in an evacuated space almost completely free of residual magnetic fields. Changes in pendulum amplitude were brought about by repeated and synchronized reversals of the magnetizing current. These changes were measured along with corresponding changes in magnetic moment of the sample. The average value obtained for the gyromagnetic ratio was 1.0278±0.0014 times the mass-to-charge ratio of the electron.
A system is described for producing a highly homogeneous, variable, and directable magnetic field. This system, which was used in gyromagnetic ratio experiments, was directed against the earth's magnetic field to obtain very nearly a field free space. Horizontal fields in this working space were held to less than 0.01 % of the earth's horizontal component.
two cases can be distinguished in two ways: by the existence or nonexistence of a transient region of M s (t)~-fi and by the magnetic field dependence of M z {t) for large t. In either case, it is possible to compute C and thus determine r for the paramagnetic ion independent of a paramagnetic resonance experiment. In the case of diffusion-limited relaxation, it is also possible 1
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