Single passage NMR of oriented nuclei in the presence of a small quadrupole interaction

The theory relevant to the observation of nuclear magnetic resonance of dilute impurities in solids, by the change in the gamma and beta ray emission distributions from oriented nuclei, is discussed for the situation where an electric quadrupole interaction produces a splitting of the nuclear magnetic resonance line comparable with the interaction energy with the applied R.F. field. The major deviations from conventional adiabatic-fast-passage expected for a single sweep of the R.F. frequency through the resonance condition are shown to be well reproduced by recent experimental results, indicating the validity of the theoretical model discussed. (author)