Detailed analysis of the S-RESPDOR solid-state NMR method for inter-nuclear distance measurement between spin-1/2 and quadrupolar nuclei

► New sequence to measure distances between spin-1/2 and quadrupolar nuclei. ► Works even at very high magnetic field and ultra-fast MAS. ► Saturation pulse instead of adiabatic passage pulse. ► S-RESPDOR and S-REAPDOR sequences. ► Only sensitive to hetero-nuclear dipolar interactions.