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- W1973886321 abstract "In KCl:${mathrm{Li}}^{+}$ crystals a Raman-active resonance associated with the ${mathrm{Li}}^{+}$ off-center impurity was observed. The Raman signal is a broad line with a full width at half maximum of 15 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ and is centered at 43ifmmodepmelsetextpmfi{}2 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, which is almost coincident with the far-infrared transitions of this defect. The behavior-type method was applied to determine the symmetry and the irreducible representation of this Raman mode. It is found to belong to the ${A}_{1g}$ representation of the cubic group ${O}_{h}$. This strongly indicates that a continuum of perturbed lattice modes is observed, and not the vibration in an off-center potential well of the ${mathrm{Li}}^{+}$ ion itself. The small and negative isotope shift upon $^{7}mathrm{Li}^{+}$ to $^{6}mathrm{Li}^{+}$ substitution also supports this idea. As such, the ${C}_{3v}$ symmetry of the off-center ${mathrm{Li}}^{+}$ ion in KCl is not reflected in the polarized Raman intensities of the 43-${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ mode. However, the displacement from the on-center site softens the selection rules of scattering and absorption and this explains the approximate degeneracy of the Raman and ir transitions." @default.
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- W1973886321 date "1986-07-15" @default.
- W1973886321 modified "2023-09-25" @default.
- W1973886321 title "Polarized Raman study of phonon modes perturbed by the off-centerLi+impurity in KCl" @default.
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- W1973886321 doi "https://doi.org/10.1103/physrevb.34.1273" @default.
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