Line Shape Analysis of the Г-Exciton Spectra of NaCl, NaBr and NaI Single Crystals
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The reflectivity spectra of NaBr and NaI have been measured in the range 5eV to 11.8eV at 85°K and particularly in the Γ(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 Γ(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 ℏΓ 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 Γ(3/2, 1/2)-exciton line to a single asymmetric Lorentzian function (A. L. F. ). ℏΓ(T) deviates from the coth-law above 70°K accompanying a rapid increase of ℏΓ due to the LO-phonon sideband. The Γ-exciton spectra of NaCl at temperatures up to 573°K can be well fitted with an A. L. F. regarding ℏΓ 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.
- 社団法人日本物理学会の論文
- 1971-08-05
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