PARAMAGNETIC-RESONANCE OF PHOTOEXCITED N-V DEFECTS IN DIAMOND .2. HYPERFINE INTERACTION WITH THE N-14 NUCLEUS

Hyperfine interactions associated with the N-14 nucleus in the diamond N-V defect have been investigated using Raman-heterodyne techniques. The measured nuclear-magnetic-resonance (NMR) and electron-nuclear-double-resonance frequencies were well accounted for by the triplet-spin Hamiltonian, where all the parameters have been fully determined. Hole-burning effects in electron paramagnetic resonance were observed and the spectral structures are found to be in good agreement with the proposed energy levels. The spin-density distribution in the complex is also discussed. The nuclear dipole moment and NMR homogeneous linewidth have been measured. Optical pumping is also shown to play an important role in determining the hyperfine-transition intensity. Interference measurements in NMR by introducing an additional rf field again indicate that population factors are responsible for the varying Raman-signal amplitudes.