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 ali gned parallel to the external magnetic field and suitable multiple-pul se sequences are applied to enable efficient polarization transfer ind ependent of the chemical-shift separation of the involved nuclei. The cross-peak intensities in the 2D spectra can be used to characterize t he domain structure of inhomogeneous solids. Variable temperature expe riments are carried out on dl-camphor. The suppression of spin diffusi on by molecular self diffusion is used to characterize the molecular d ynamics.