Pulsed ELDOR detected NMR

Abstract A pulsed EPR method for the determination of small hyperfine interactions in disordered systems is described. A selective preparation pulse of frequency ω mw (1) excites allowed and forbidden transitions, thereby burning spectral holes into the EPR line. The positions of the holes caused by the excitation of forbidden transitions correspond to the nuclear transition frequencies of the spin system. A selective detection pulse of frequency ω mw (2) creates an FID with integrated intensity proportional to the magnetization at frequency ω mw (2) . The entire hole pattern is obtained by recording the integrated intensity of the FID while varying the frequency difference Δω mw =ω mw (1) −ω mw (2) step by step.