A numerical simulation study of recoupling pulse sequences in magic angle spinning
solid-state NMR is carried out, using a model spin system. One particular pulse sequence,
part of a family of symmetry-based pulse sequences, C72
1 is considered in this study. The
C72
1 pulse sequence shows high double-quantum filtration efficiency for 13C spin pairs that
have a large dipolar coupling interaction. However, the C72
1 pulse sequence shows very low
double-quantum filtration efficiency for 13C spin pairs that have a small dipolar coupling
interaction. The double-quantum filtration efficiency for spin pairs with large dipolar
coupling interactions is found to be further improved by reducing the Larmor frequency. The
double-quantum filtration efficiency for spin pairs with a small dipolar coupling interaction is
found to be improved by increasing the duration or the amplitude of the radiofrequency
pulses applied during the experiment. The modified pulse sequence depends on isotropic
chemical shifts and chemical shift anisotropies
