Ontology type: schema:ScholarlyArticle
2018-04-18
AUTHORSV. Yu. Osipov, A. I. Shames, N. N. Efimov, F. M. Shakhov, S. V. Kidalov, V. V. Minin, A. Ya. Vul’
ABSTRACTThe electron paramagnetic resonance (EPR) spectra of triplet centers in detonation nanodiamonds (DNDs) and diamond single crystals of submicrometer size, synthesized from those DNDs at high pressures and temperatures, are studied. In the EPR spectra of DNDs, signals from negatively charged nitrogen- vacancy centers (NV)/sup(-) with a g factor of g1 = 4.24 and multivacancies with g2 = 4.00 are observed. The signals from (NV)/sup(-) centers disappear in the spectra of diamond single crystals, and a quintet signal with g = 4.00 is detected at the position of the signal from multivacancies. Analysis of the shape and position of the quintet’ lines showed that this ESR signal is due to the pairs of nitrogen substitution centers in diamond, separated from each other by distances not exceeding 0.7 nm, between which a strong exchange interaction takes place. A comparison of the experimental data and the simulation results allows determining the spin-Hamiltonian parameters of the exchange-coupled pairs of paramagnetic impurity nitrogen atoms. More... »
PAGES723-729
http://scigraph.springernature.com/pub.10.1134/s1063783418040236
DOIhttp://dx.doi.org/10.1134/s1063783418040236
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