General Theory of Cross Relaxation. III. Application to Experiment

The theory developed in parts I and II is applied to the classical experiments of Mims and McGee, and Pershan. The predictions of the theory regarding the dependence of $W_{\mathrm{CR}}$ on the energy imbalance $\hslash \omega$ on concentration and on the exchange radius, as well as the prediction of the actual magnitude of $W_{\mathrm{CR}}$, are confirmed in the Mims and McGee experiment on ruby. The crucial significance of near-neighbor dipole interactions, in particular, the effect of the associated power spectrum, which is quite broad and quite sensitive to crystal direction, is illustrated by application of the theory to Pershan's experiments on LiF.