Context

Solid-phase nuclear magnetic resonance (NMR) is currently undergoing remarkable instrumental and methodological developments. These include the use of increasingly intense external B ₀ fields (B ₀ = 23.5 T, Larmor frequency associated with the proton: ~ 1 GHz), increases in sensitivity over several orders of magnitude, and the implementation of new NMR signal acquisition methods.

Quadrupole nuclei (i.e. those with nuclear spin I > 1/2, with I integer or half-integer) make up around 75% of the magnetically active nuclei in the periodic table. Examples include ² H (I = 1), ¹⁴ N (I = 1), ²³ Na (I = 3/2), ^27...