Pulsed Nuclear Magnetic Resonance in Cesium Fluoride

Pulse nuclear-magnetic-resonance techniques have been used to obtain the free-induction-decay curves of both the ${\mathrm{F}}^{19}$ and ${\mathrm{Cs}}^{133}$ nuclear spin systems in single crystals of cesium fluoride. The experimental curves are compared with the theories of Gade and Lowe and of Lee, Tse, Goldburg, and Lowe. The ${\mathrm{F}}^{19}$ free induction decays can be satisfactorily described by considering only dipolar interactions among the nuclear spins. The ${\mathrm{Cs}}^{133}$ free induction decays are not in agreement with the predictions of dipolar theory. It is suggested that this departure is due to nuclear electric quadrupole effects.