It is important not to picture a solid as a rigid entity but rather as one in which there is motion, driven by thermal energy, albeit on a more restricted scale than in solution (Figure 7.1). Motion is the driving force for relaxation and it can have an impact on the appearance of the NMR spectrum.
Figure 7.1. Examples of the timescales of motions in the solid state and the NMR properties that can be used to explore them.
This chapter starts by exploring the relationship between motion and relaxation. It is shown how the relaxation behavior can be used to deduce information ...