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- W1969694057 abstract "Optical absorption of single-crystal, cerium-doped lutetium oxyorthosilicate has been carefully measured in the temperature interval 10--300 K. Prominent Gaussian absorption peaks occur at $3.432ifmmodepmelsetextpmfi{}0.002mathrm{eV}$ (peak a), $3.502ifmmodepmelsetextpmfi{}0.002mathrm{eV}$ (peak b), $4.236ifmmodepmelsetextpmfi{}0.0002mathrm{eV}$ (peak c), and $4.746ifmmodepmelsetextpmfi{}0.0002mathrm{eV}$ (peak d), in excellent agreement with previously reported excitation spectra. The second moments are well described by the usual linear model, yielding the Huang-Rhys parameter (S) and vibrational quantum energies for the individual peaks. All absorption bands are characterized by $S>5$ indicating strong coupling between the ${mathrm{Ce}}^{3+}$ ion and lattice. Temperature dependence of the band centroids exhibits contrasting behavior that is dominated by higher-order coupling terms in the linear harmonic oscillator model or by crystal-field effects. Oscillator strengths of the $4stackrel{ensuremath{rightarrow}}{f}5d$ transitions are calculated from Smakula's formula and knowledge of the ${mathrm{Ce}}^{3+}$ distribution between the two crystallographically inequivalent sites. Values for peaks b, c, and d range from approximately 0.003 to 0.004, and peak a spans magnitude approximately 0.012 to 0.018. From the known correlation between average ${mathrm{Ce}}^{3+}$-ion-ligand distance and oscillator strength, we tentatively conclude that peak a is correlated with the seven-oxygen-coordinated site, and peaks b, c, and d are associated with the six-oxygen-coordinated site. These results support the previously proposed two-activation-center model and identify the centers as the two crystallographically inequivalent substitutional sites." @default.
- W1969694057 created "2016-06-24" @default.
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- W1969694057 date "2000-05-01" @default.
- W1969694057 modified "2023-09-26" @default.
- W1969694057 title "Electron-lattice coupling parameters and oscillator strengths of cerium-doped lutetium oxyorthosilicate" @default.
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- W1969694057 doi "https://doi.org/10.1103/physrevb.61.11973" @default.
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