Correlating nuclear frequencies by two-dimensional ELDOR-detected NMR spectroscopy.

Highlights: [•] A triple resonance experiment that correlates ELDOR-detected NMR signals is described. [•] Theory and simulations to account for the cross peaks is presented. [•] Negative cross peaks appear between nuclear frequencies belonging to different M S manifolds. [•] Positive cross peaks are produced by of off resonance effects and nuclear relaxation. [•] Experiment is demonstrated on 14N of a nitroxide and 33S and 14N of Cu(II) type one center of Azurin. [ABSTRACT FROM AUTHOR]