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Abstract
The decoupling of dipolar proton-proton interactions by a strong second radio frequency field in ENDOR spectroscopy is reported. A theoretical description of the decoupling effect for a system with one electron and two nuclear spins of ½ is given for anisotropic g and hyperfine tensors. The results indicate that the hyperfine tensor of the pumped nucleus influences the decoupling behaviour remarkably. Transition frequencies and intensities predicted by theory are compared with experimental data from Cu(gly)2 in α-glycine. Further applications of this spin decoupling technique are discussed. As an example, the assignment of ENDOR proton lines to specific water molecules in Cu2+ : (NH4)2Mg(SO4)2·6H2O is presented.