Key points are not available for this paper at this time.
A beat structure has been found on free-induction decays associated with the pulsed nuclear magnetic resonance of nuclei in rigid lattices. A general quantum-mechanical theory is developed for the shapes of induction decays. The theory is specialized to the case of rigid solids and applied to the magnetic dipolar interactions among the F^19 nuclei in a fluorite (CaF₂) crystal. It is also shown rigorously that, except at very low temperatures, a free-induction decay is the Fourier transform of the corresponding steady-state resonance line shape. The calculation of the shape of an induction decay in CaF₂ thus corresponds to the calculation of the shape of the F^19 resonance line for the crystal. It is demonstrated that the resonance line shape for an ordered rigid lattice is not Gaussian.
Lowe et al. (Mon,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: