Hyperfine selectivity using multiquantum electron–nuclear–electron triple resonance

Abstract

Hyperfine selectivity is demonstrated in a continuous wave electron–nuclear double resonance (ENDOR) experiment. A multiquantum electron–electron double resonance (ELDOR) signal is monitored as a function of the nuclear radio frequency. The signs and relative intensities of the ENDOR lines permit separating the case where both ELDOR and ENDOR frequencies match hyperfine couplings from the cases where this condition is not satisfied.