Free precession decay of nuclear pairs in solids

The nodes in the free precession decay of proton pairs in a rigid lattice, with dipolar interaction between the protons of a pair, are determined by both the distance between the protons and the possible motion of the pairs. Interaction between the pairs does not alter the place of these nodes. When using the Fourier transform of a cw lock-in experiment, the amplitude of the modulation field also appears to have no influence on the nodes, whereas they are only slightly altered because of saturation of the spin system.