Abstract
The exchange of particles and the (noncorporeal) exchange of magnetization in systems are considered where nuclei exist in various regions which differ in their magnetic resonance properties. We start with the stochastic theory of nuclear magnetic resonance and relaxation in such systems. Two-region systems are treated in some detail; here, also, the modified Bloch equations are introduced. Experimental examples concerning adsorbent-adsorbate systems are given. Finally, the influence of cross-relaxation on the relaxation of molecules adsorbed on interfaces is taken into account, the corresponding theory being treated. NMR methods which allow to distinguish between particle and spin exchange are discussed.
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