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(a) The general pulse sequence for 2D 13C-13C R2nv homonuclear correlation experiments. An RF field irradiation is applied on proton spins during the mixing time. R irradiation represents rotor-synchronized R2-type symmetry pulses: (b) R212 (ωrf = ωr), (c) R211 (ωrf = ωr), (d) R222 (ωrf = ½ ωr), (e) R221 (ωrf = ½ ωr), and (f) POST R221 (ωrf = ωr).
