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- W2029385286 abstract "Optical-absorption measurements show that ${mathrm{H}}^{ensuremath{-}}$ ions are thermally much more stable than anion vacancies when thermochemically reduced MgO samples are annealed in a reducing atmosphere. At 1900 K all anion vacancies are annihilated, but the concentration of ${mathrm{H}}^{ensuremath{-}}$ ions remains unchanged. Results of electron irradiations on a crystal annealed at 1900 K demonstrate unambiguously that the infrared-absorption peaks previously attributed to ${mathrm{H}}^{ensuremath{-}}$ ions are indeed due to protons in anion sublattice sites. ${mathrm{H}}^{ensuremath{-}}$ concentrations can be obtained from the infrared absorbance of the ${mathrm{H}}^{ensuremath{-}}$ ions. The lifetime of the 2.3-eV $F$-center phosphorescence is shown to be affected by the relative concentrations of ${mathrm{H}}^{ensuremath{-}}$ ions to anion vacancy. Decreasing the anion-vacancy concentration by thermal annealing, thereby increasing the relative concentration of ${mathrm{H}}^{ensuremath{-}}$ ions to anion vacancies, leads to an enhancement of the lifetime of the phosphorescence." @default.
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- W2029385286 date "1983-01-15" @default.
- W2029385286 modified "2023-10-12" @default.
- W2029385286 title "Charge and mass transfer involving hydrogen in MgO crystals thermochemically reduced at high temperatures" @default.
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- W2029385286 doi "https://doi.org/10.1103/physrevb.27.1276" @default.
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