Abstract
The results of NMR free-induction-decay-shape measurements for F19 in single crystals of CaF2 and polycrystalline CaF2 are reported. The second and fourth moments of the corresponding absorption line are derived by empirical fits of the decay shapes. The probable errors for our results are smaller than those reported by earlier workers, and the results agree more closely with theoretical predictions for spins in a rigid lattice.