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- W1995803830 abstract "The reflectivity spectra of NaBr and NaI have been measured in the range 5 eV to 11.8 eV at 85°K and particularly in the (varGamma)(3/2, 1/2)-exciton region at several temperatures between 26°K and 302°K. Below about 150°K, a sideband is separated from the (varGamma)(3/2, 1/2)-peak in its higher energy side, the peak-sideband separation being about two times of the LO-phonon energy. This results from the energy dependence of the broadening function (hbarvarGamma) and the sideband is identified as an LO-phonon sideband due to the simultaneous creation of a quasifree pair of an exciton and an LO-phonon. Above 150°K, this sideband merges in the higher energy tail main peak conforming the whole (varGamma)(3/2, 1/2)-exciton line to a single asymmetric Lorentzian function (A. L. F.). (hbarvarGamma(T)) deviates from the coth-law above 70°K accompanying a rapid increase of (hbarvarGamma) due to the LO-phonon sideband. The (varGamma)-exciton spectra of NaCl at temperatures up to 573°K can be well fitted with an A. L. F. regarding (hbarvarGamma) as an energy-independent quantity and assuming the coth-law on its temperature dependence. The reliability of the values deduced from the Kramers-Kronig analysis is also investigated." @default.
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- W1995803830 date "1971-08-01" @default.
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- W1995803830 title "Line Shape Analysis of the (varGamma)-Exciton Spectra of NaCl, NaBr and NaI Single Crystals" @default.
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