CHEMICAL-SHIFT IMAGING IN ROTATING SOLIDS BY RADIOFREQUENCY FIELD GRADIENTS

A dedicated equipment has been designed for solid state NMR imaging in the spatial direction coinciding with the rotation axis of a C-13 CP/ MAS probe, It involves a two-turn B-1 gradient coil whose plane is per pendicular to that axis and a H-1-C-13 doubly tuned saddle coil used f or normal spectroscopic operations, orthogonal to the latter. The expe riment provides a two-dimensional diagram with C-13 chemical shift in one dimension whereas the second dimension corresponds to the space va riable. Some test experiments demonstrate the validity of this approac h. (C) 1998 Academic Press.