Floquet Treatment of MAS and RF Synchronisation

In this section we will deal with homonuclear dipolar decoupling sequences where the RF irradiation is synchronised with MAS. 

Special classes of multiple-pulse sequences were designed by Levitt et al, using the symmetry principles of internal spin Hamiltonians [77,86-88] where an integer number of RF pulse units spans a certain number of rotor cycles. These sequences are classified as CN and RN sequences [77]. 

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