Broad-band homo-nuclear correlations assisted by 1H irradiation for bio-molecules in very high magnetic field at fast and ultra-fast MAS frequencies

► SHANGHAI: second-order proton-assisted 13C-13C correlation. ► Allows recoupling of 13C resonance frequencies separated by more than 38 kHz at 23.5 T. ► Requires weak rf-field (>c.a. 10 kHz). ► Complementary to PARISxy (m = 2) recoupling scheme. ► Can be used at fast or ultra-fast MAS, whatever the spinning speed.