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Simplified RF schemes for commonly used 13C homonuclear mixings. (a–e) Transfers based predominantly on 13C–13C scalar couplings. Schemes in (f–h) recouple either dipolar 13C–13C couplings (f–h) or (i) higher-order cross-terms involving also 1H–13C dipolar couplings. In (a) and (b), bell-shaped pulses represent band-selective pulses; “BS” denotes the Bloch–Siegert phase compensation pulses, and δJ is a delay adjusted to the magnitude of scalar coupling: δJ = (4J)−1.
