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- W2022039251 abstract "The infrared and far-infrared absorption spectra of β-GaSe and GaS have been measured in the temperature range from 50 to 300°K for the radiation polarized perpendicular to the c -axis in the hexagonal layer structure of these compounds. The reststrahlen frequencies measured at room temperature are 211.0 cm -1 in β-GaSe and about 310 cm -1 in GaS, respectively. In addition, the weak absorptions in the wave number range from 400 cm -1 to 750 cm -1 are identified with the multiphonon absorptions in the light of group theoretical analysis and of the experimental results on the Raman effect and on the electro-luminescence available up to date. The absorption line at 512 cm -1 and band around 450 cm -1 in β-GaSe are explained in terms of the localized mode of lattice vibrations induced possibly by an oxygen impurity. This analysis is the first preliminary investigation on the localized mode in a diatomic crystal of hexagonal structure." @default.
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- W2022039251 date "1970-04-01" @default.
- W2022039251 modified "2023-10-16" @default.
- W2022039251 title "Phonon Structures in Optical Spectra of Layer Compounds GaSe and GaS" @default.
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- W2022039251 doi "https://doi.org/10.1143/jpsj.28.981" @default.
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