AN RF-DRIVEN NUCLEAR SPIN-DIFFUSION EXPERIMENT USING ZERO-ANGLE SAMPLE-SPINNING

A zero-angle sample spinning approach to obtain high-resolution solid-state spin-diffusion spectra is Presented. During the mixing period of a two-dimensional spin-diffusion experiment, the rotation axis is aligned parallel to the external magnetic field and suitable multiple-pulse sequences are applied to enable efficient polarization transfer independent of the chemical-shift separation of the involved nuclei. The cross-peak intensities in the 2D spectra can be used to characterize the domain structure of inhomogeneous solids. Variable temperature experiments are carried out on dl-camphor. The suppression of spin diffusion by molecular self diffusion is used to characterize the molecular dynamics.