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• W2604678907 abstract "We studied isotopically enriched nano- and microdiamonds with optically active ${mathrm{GeV}}^{ensuremath{-}}$ centers synthesized at high pressures and high temperatures in nonmetallic growth systems. The influence of isotopic composition on optical properties has been thoroughly investigated by photoluminescence-excitation (PLE) and photoluminescence (PL) spectroscopy to get insight into the nature and electronic structure of this color center. We have demonstrated that the large frequency defect (difference between oscillation frequencies in the ground and excited electronic states) does bring about large discrepancy between PLE and PL spectra and comparatively high isotopic shift of the zero phonon line. Both effects seem to be rather common to split-vacancy centers (for example ${mathrm{SiV}}^{ensuremath{-}})$, where the frequency defect reaches record high values. Isotopic substitution of carbon atoms in the diamond lattice results in even larger shifts, which are only partially accounted for by a redistribution of electron density caused by the volume change of the diamond lattice. It was shown that the vibronic frequency in this case does not depend on the mass of carbon atoms. The greatest part of this isotopic shift is due to anharmonicity effects, which constitute a substantial part of vibronic frequency observed in this center. The exact physical mechanism, which leads to significant enhancement of anharmonicity on substitution of $^{12}mathrm{C}$ to $^{13}mathrm{C}$, is yet to be clarified." @default.
• W2604678907 created "2017-04-14" @default.
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• W2604678907 date "2017-03-15" @default.
• W2604678907 modified "2023-10-17" @default.
• W2604678907 title "Anharmonicity effects in impurity-vacancy centers in diamond revealed by isotopic shifts and optical measurements" @default.
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• W2604678907 doi "https://doi.org/10.1103/physrevb.95.094113" @default.
• W2604678907 hasPublicationYear "2017" @default.
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