Nuclear Magnetic Relaxation and Diffusion in Liquid SF6

摘要

The longitudinal nuclear magnetic relaxation timeT1and the diffusion coefficientDin a sample of SF6liquified under pressure have been measured by spinmdash;echo techniques. The closed sample contained approximately a critical density of SF6. The measurements were made at temperatures between the freezing temperature, 221deg;K, and 315deg;K, which is 3.5deg;K below the critical temperature. Misch metal was used as an oxygen getter in the preparation of the sample. The measured values ofT1are compared with values calculated on the assumption that the relaxation is due to spinmdash;rotational interactions and to intrahyphen; and intermolecular dipolemdash;dipole interactions. The calculated and measured values of (1/T1) agree fairly well if reasonable values of the spinmdash;rotational interaction constants are assumed. The calculation indicates that the nuclear magnetic relaxation of liquid SF6is produced mainly by spinmdash;rotational interactions.