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- W2034190101 abstract "The doping of KCl with substitutional ${mathrm{H}}^{ensuremath{-}}$ and ${mathrm{D}}^{ensuremath{-}}$ ions has been extended from the usual low-concentration $U$-center range (${10}^{ensuremath{-}5}$ to ${10}^{ensuremath{-}3}$ mole ratio) into the ${10}^{ensuremath{-}2}$ to ${10}^{ensuremath{-}1}$ range. This high${mathrm{H}}^{ensuremath{-}}$ concentration has made possible Raman measurements of two effects, which so far were not accessible: (1) The ${mathrm{H}}^{ensuremath{-}}$ defect-induced one-phonon spectrum (0-150 ${mathrm{cm}}^{ensuremath{-}1}$) which in various scattering geometries displays the coupling of the ${mathrm{H}}^{ensuremath{-}}$ ion to perturbed phonons of ${A}_{1g}$, ${E}_{g}$, and ${T}_{2g}$ symmetries. (2) A new combination process of the ${mathrm{H}}^{ensuremath{-}}$ or ${mathrm{D}}^{ensuremath{-}}$ local mode with lattice phonons, appearing in the parallel scattering geometry as a broad spectrum around 600 and 430 ${mathrm{cm}}^{ensuremath{-}1}$ for ${mathrm{H}}^{ensuremath{-}}$ and ${mathrm{D}}^{ensuremath{-}}$, respectively. Besides these new effects, the second harmonic of the ${mathrm{H}}^{ensuremath{-}}$ local mode near 1000 ${mathrm{cm}}^{ensuremath{-}1}$ (${mathrm{D}}^{ensuremath{-}}$ near 700 ${mathrm{cm}}^{ensuremath{-}1}$) is observed, split into three components of ${A}_{1g}$, ${E}_{g}$, and ${T}_{2g}$ symmetry, similar to those measured previously for KI: KH and KBr: KH. All three Raman responses scale with the ${mathrm{H}}^{ensuremath{-}}$ doping for low concentrations, but display at high doping levels marked changes due to ${mathrm{H}}^{ensuremath{-}}$-${mathrm{H}}^{ensuremath{-}}$ interaction. A theoretical treatment of these results is planned to be presented in a separate paper." @default.
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- W2034190101 title "Raman scattering and perturbed phonons in KCl: KH and KCl: KD. Experiments" @default.
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- W2034190101 doi "https://doi.org/10.1103/physrevb.23.28" @default.
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