Multiple resonance heteronuclear decoupling under MAS: Dramatic increase of spectral resolution at moderate magnetic field and MAS frequencies

► A multiple-channel probe allows simultaneous irradiation on 1H, 19F, 27Al and 31P. ► 19F and 31P non-refocusable T2 are lengthened under heteronuclear decoupling. ► Spectral resolution is increased. ► Small interactions are used to generate 2D correlation NMR spectra.