Figure 2.

Space-spin selection diagrams for selecting the first order Hamiltonian terms corresponding to CSA (left) and homonuclear dipolar interactions (right) by symmetry sequences R10₁³ (a) and R10₁⁴ (b). (a) R10₁³ selects the components of CSA interactions characterized by quantum numbers {2, 2, 1, −1} and {2, −2, 1, 1} while suppressing all the components of homonuclear dipolar interactions. (b) R10₁⁴ selects the components of CSA interactions with quantum numbers {2, 1, 1, −1} and {2, −1, 1, 1} while recoupling two components of homonuclear dipolar interactions with quantum numbers {2, 2, 2, −2} and {2, −2, 2, 2}.