MAS Synchronised Sequences

Developing sequences with both MAS and RF taken into account are of prime importance in solid-state NMR. Probably the first attempt in synchronising RF and 

Symmetry arguments have been proposed by Levitt and coworkers [77,86-88] that enable a constructive combination of both MAS and RF based on certain symmetry properties of the internal spin Hamiltonians. Two classes of symmetry sequences have been proposed, CN [86] and [87,88]. Selective recoupling or decoupling of spin interactions is possible with a suitable combination of the symmetry numbers, N, k and x- An example of RI82 for homonuclear dipolar decoupling will be discussed later. 

---