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 13C CP/MAS probe. It involves a two-turn B1 gradient coil whose plane is perpendicular to that axis and a 1H-13C doubly tuned saddle coil used for normal spectroscopic operations, orthogonal to the latter. The experiment provides a two-dimensional diagram with 13C chemical shift in one dimension whereas the second dimension corresponds to the space variable. Some test experiments demonstrate the validity of this approach. Copyright 1998 Academic Press.