13C nuclear magnetic resonance spectroscopy proton-decoupled nuclear magnetic resonance spectroscopy proton-decoupled 13C nuclear magnetic resonance spectroscopy A type of NMR spectroscopy where (J/scalar) couplings between 13C and 1H nuclei are cancelled by applying radio frequency radiation to saturate or otherwise manipulate the 1H spins such that no evolution of the coupling occurs. 13C{1H}-NMR 13C{1H}-NMR spectroscopy CHMO:0000890