Nuclear Magnetic Resonance in GaseousHe3

Abstract

Relative nuclear magnetic susceptibility, self-diffusion coefficient $D$, and spin lattice relaxation time $T_1$ (characteristic of wass relaxation) were measured in ${\mathrm{He}}^3$ gas between 1.7 and 4.2°K in the range of pressure between 0.08 and 56 atm. These results were derived from measurements of free induction decays and spin echoes at 20.00 Mc/sec. Values for the density of the gas were deduced on the assumption that the gas obeys Curie's law. At moderate densities $D$ was found to be inversely proportional to the density, while $T_1$ was found to increase with the density of the gas. Experimental results obtained for the self-diffusion coefficient are compared with theoretical values. Details of experimental procedure are described.