Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR)

Abstract

The pattern of obtaining NMR spectra (Fig. 60) is analogous tor the EPR patten, but with differences conditioned by the nature of the electron and nucleus spin moments, and by the value of the electron and nuclear magnetic moments. The energy levels between which the transition is accomplished (Fig. 61). resulting in the appearance of the NMR signal, are nuclear levels, as in Mossbauer spectroscopy (NGR), but in NMR the transitions take place between sublevels of the ground state arising in the applied magnetic field, whereas in NGR, transitions occur between the ground and excited levels of the nucleus (see Fig. 7).