Efficient theory of dipolar recoupling in solid-state nuclear magnetic resonance of rotating solids using Floquet-Magnus expansion: Application on BABA and C7 radiofrequency pulse sequences

► Use of Floquet-Magnus expansion to treat theoretical problems in solid-state NMR. ► The application of the FME on BABA and C7 recoupling sequences. ► Double-quantum terms predicted by FME are the same in the first order as those obtained by AHT. ► Unique additions to AHT and FT by FME are the expressions for Λn(t) (n=1, 2, ...). ► The analysis of Λn(t) to produce double-quantum coherences shows that the C7 sequence perform better than the BABA sequence.