High-frequency pulsed ENDOR spectroscopy of the NV- centre in the commercial HPHT diamond

Abstract

© 2015 Elsevier Inc. All rights reserved. This work reports direct 94 GHz ENDOR spectroscopy of the 14N nuclei in the NV- centre in single-crystal diamond. Roadmaps of ENDOR frequencies were measured and hyperfine/quadrupole interaction parameters were obtained, with AX,Y = -2.7 MHz, AZ = -2.2 MHz and P = -4.8 MHz. The sign and value of each parameter was calculated using spin Hamiltonian matrix diagonalization, first and second order perturbation theory and confirmed experimentally. Magnetic field magnitude was measured by 13C ENDOR signal with 0.02% precision or 0.5 mT. The orientation of quadrupole, hyperfine and fine structure tensors are the same within error of experiment, g-factor is isotropic.