magic angle spinning nuclear magnetic resonance spectroscopy rotational-echo double-resonance spectroscopy CHMO:0000896 rotational echo double resonance spectroscopy REDOR rotational echo double-resonance (REDOR) spectroscopy A magic angle spinning NMR experiment in which the evolution of dipolar couplings between nuclei is controlled by applying pulses at appropriate points in the rotational period, allowing the determination of the size of the coupling and, thus, yielding distance information.