Pulsed NMR experiments in superfluid 3He

We have observed frequency shifts in the A and B phases of superfluid 3He under pulsed NMR conditions, and have measured the nuclear susceptibility chi and the spin-lattice relaxation time T1 using pulsed NMR techniques. In 3He-A the frequency shift ω - γH0 varies from the continuous-wave value at tipping angle phi = 0 to a negative shift for phi approx. 1800. In 3He-B no simple frequency shift is observed, but for phi > 1040 a beat pattern is observed whose frequency increases with phi. Theoretical predictions for both phases are compared with the data. Values of the nuclear susceptibility chi/sub B/ are compared with those of several other groups, and values of the superfluid density rho/sub s//rho and the Yoshida function Y (T) are extracted as a function of temperature. The spin-latttice relaxation data indicate that new and unusual relaxation mechanisms exist below T/sub c/. In 3He-A, T1 decreases very rapidly below T/sub c/ and the magnetization recovery from saturation becomes linear in time. In 3He-B, the magnetization recovery is exponential in time, but the relaxation rate 1/T1 is linear in applied field gradient. Possible explanations are discussed