Rural investment climate and business activities of agro-enterprise: Evidence from northern area of Vietnam

2013東京農業大

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

© 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

Size-dependent concentration of N0 paramagnetic centres in HPHT nanodiamonds

© Kazan Federal University (KFU). Size-calibrated commercial nanodiamonds synthesized by high-pressure high-temperature (HPHT) technique were studied by high-frequency W- and conventional X-band electron paramagnetic resonance (EPR) spectroscopy. The numbers of spins in the studied samples were estimated. The coreshell model of the HPHT nanodiamonds was proposed to explain the observed dependence of the concentration of the N0 paramagnetic centers. Two other observed paramagnetic centers are attributed to the two types of structures in the nanodiamond shell

Reply to 'Comment on "angstrom-scale probing of paramagnetic centers location in nanodiamonds by ³He NMR at low temperatures"' by A. Shames, V. Osipov and A. Panich,: Phys. Chem. Chem. Phys. 2018, 20, DOI: 10.1039/c8cp03331e

© the Owner Societies 2018. Shames et al. made a comment on our article (DOI: 10.1039/C7CP05898E) stating that their experience in EPR studies of detonation nanodiamonds suggests the existence of two main types of paramagnetic center in detonation nanodiamonds which questions our results. In this reply we provide insights into why there is only one main type of paramagnetic centers detected in nanodiamonds used in this work, which validates the correctness of the proposed original method to determine the distances between paramagnetic centers and nanoparticle surfaces by 3He NMR