A novel use of hyperfine structure in the electron paramagnetic resonance of interacting pairs of paramagnetic defects in diamond

It is the hyperfine structure of N-14 and C-13 in the electron paramagnetic resonance (EPR) spectrum which indicates that the unpaired electron of a s ingle substitutional nitrogen atom in diamond is in one of the four anti-bo nding N-C orbitals. We show that, for diamonds containing a very high conce ntration of nitrogen, the hyperfine structure of interacting pairs of nitro gen atoms indicates that for close neighbours there are unique orientations of the constituent N-C bonds, while at larger distances the orientations a re random.