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A proton magnetic resonance study of polycrystalline Af as a function of magnetic field and temperature is presented.
Af is paramagnetic, and electron paramagnetic dipole as well as nuclear dipole effects lead to line broadening.
The lines are asymmetric and over the range of field Af gauss and temperature Af the asymmetry increases with increasing Af and decreasing T.
An isotropic resonance shift of Af to lower applied fields indicates a weak isotropic hyperfine contact interaction.
The general theory of resonance shifts is used to derive a general expression for the second moment Af of a polycrystalline paramagnetic sample and is specialized to Af.
The theory predicts a linear dependence of Af on Af, where J is the experimentally determined Curie-Weiss constant.
The experimental second moment Af conforms to the relation Af in agreement with theory.
Hence, the electron paramagnetic effects ( slope ) can be separated from the nuclear effects ( intercept ).
The paramagnetic dipole effects provide some information on the particle shapes.
The nuclear dipole effects provide some information on the motions of the hydrogen nuclei, but the symmetry of the Af bond in Af remains in doubt.
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