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- W2009059993 abstract "The far-infrared optical constants of KI were studied in the vicinity of the $mathrm{TO}(stackrel{ensuremath{rightarrow}}{mathrm{k}}=0)$ phonon frequency ${ensuremath{nu}}_{0}=101$ ${mathrm{cm}}^{ensuremath{-}1}$ (in wave-number units). Experimental values of the optical constants at $T=300$ifmmode^circelsetextdegreefi{}K were determined from transmission and reflection measurements employing a Michelson interferometer operated in the asymmetric mode. Theoretical values were calculated from a theory which utilizes thermodynamic Green's functions to include the effects of the interaction of the optically active phonon with other phonons because of cubic anharmonicity. Phonon-dispersion data for the calculation were generated from a shell model, with parameters selected by Dolling to give the phonon frequencies as determined from neutron-diffraction experiments. Good agreement for the optical constants in the region approximately 20-175 ${mathrm{cm}}^{ensuremath{-}1}$ was obtained by using a nearest-neighbor central-force model and adjusting the third derivative of the ${mathrm{K}}^{+}$-${mathrm{I}}^{ensuremath{-}}$ bond potential to ${ensuremath{Phi}}^{ensuremath{'}ensuremath{'}ensuremath{'}}({r}_{0})=ensuremath{-}3.6ifmmodetimeselsetexttimesfi{}{10}^{12}$ ${mathrm{e}mathrm{r}mathrm{g}/mathrm{c}mathrm{m}}^{3}$." @default.
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- W2009059993 date "1971-11-15" @default.
- W2009059993 modified "2023-10-18" @default.
- W2009059993 title "Far-Infrared Optical Constants of KI" @default.
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- W2009059993 doi "https://doi.org/10.1103/physrevb.4.3572" @default.
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