Nuclear magnetic resonance and relaxation properties of solid SF6

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Abstract
Line shape and relaxation studies of the low temperature solid phase of SF6 stable below 94 K show the presence of two inequivalent lattice sites, one‐quarter of the SF6 molecules being characterized by a barrier to isotropic reorientation of 1.9 and the remainder by a barrier of 2.8 kcal/mole. The chemical shift anisotropy (σ∥−σ⊥) of the S–F bond in SF6 is found to be 300±50 ppm. The sensitivity of line shape to rf field level in the cubic phase between 94 and 135 K is adequately described by the Goldman–Provotorov theory of ’’saturation narrowing’’. The activation energy for translational diffusion in this phase is 9.8 kcal/mole.