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• W1974707890 abstract "The lattice dynamics of the $F$ center in its electronic ground state in NaCl, KCl, KI, and KBr crystals is considered in connection with the defect-induced electronic Raman spectra, and the lattice and electronic absorptions. Two different dynamical models are adopted: (a) a change in the central force constant $ensuremath{lambda}$ between the defect and the nearest neighbors (nn), and a change in the central force constant $ensuremath{gamma}$ between the nn ions and the fourth neighbors; (b) a change in the central and noncentral (${ensuremath{lambda}}^{ensuremath{'}}$) force constants between the defect and nn's, and a change in central force constant (${ensuremath{lambda}}^{ensuremath{'}ensuremath{'}}$) between the defect and next-nearest neighbors. $ensuremath{lambda}$ and $ensuremath{gamma}$, are estimated by means of calculations based on the available wave functions. For the electronic absorption and Raman spectra, we work in the approximation of a linear electron-phonon interaction, and the coupling constants are derived from the experimental stress coefficients. The dynamical input data were taken at 0ifmmode^circelsetextdegreefi{}K temperature. Good agreement is found between the experimental data and the absorption-band shape parameters, when the corrections coming from the anharmonic effects are taken into account. Some discrepancies between the theoretical results and experimental data are found for the first-order Raman scattering spectra. They are explained in part by means of the bulk anharmonicity, and in part by means of the local anharmonicity. The existence of a strong peak is predicted in KI Raman spectra, due to a Raman active mode in the gap. As regards the infrared properties of the $F$ center, we have found resonance and gap mode frequencies in the calculated absorption spectra of KBr ind KI; their dependence on the long-range forces of the lattice is briefly discussed." @default.
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• W1974707890 date "1969-03-15" @default.
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• W1974707890 title "Optical Response Functions of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>F</mml:mi></mml:math>Center" @default.
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• W1974707890 doi "https://doi.org/10.1103/physrev.179.906" @default.
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