Abstract
A calcuation of the pulsed nmr signals resulting from slow random reorientation of the nuclear interaction vector among the four orientations described by the four vectors joining the center and each of the four vertices of a regular tetrahedron is described. This tetrahedral model is useful in describing two different phenomena observed in clay-water systems. The first of these is the existence of a doublet splitting in the pulsed nmr spectra of clay-water systems of low water content. The second is the shape of the pulsed nmr signals for clay-water systems in which translational diffusion is important. The latter systems usually have a high water content. The doublet splitting and the correlation time, which is related to the translational path of the water molecule, are used to describe the orientation effects of water molecules in clay-water systems.
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