The Urbach Tails and Reflection Spectra of NaCl Single Crystals
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概要
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In the tail part region of the first exciton band, the absorption constant (10^<-1> to 10^2cm^<-1>) was measured on zone-refined and Harshaw NaCl single crystals from 10°K to 573°K. Fundamental absorption tails of pure NaCl single crystals are represented by the modified Urbach rule, which describes the influence of zero-point lattice vibrations at low temperature. Analysing a temperature dependence of Urbach constant σ = σ_0F, it was found that σ_0 = 0.757 and the temperature of zero-point phonon is ωh/2 = 58.2°K. Reflection spectra of single crystals were measured from 2112Å to 1060Å in the same temperature range. The peak shift of the first reflection band is investigated as a function of temperature to clarify the mode of phonons interacting with the exciton in the main part of the band.
- 社団法人日本物理学会の論文
- 1967-01-05
著者
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MIYATA Takeo
Matsushita Research Institute Tokyo, Inc.
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Tomiki Tetsuhiko
Matsushita Research Institute Tokyo Inc.
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Miyata Takeo
Matsushita Research Institute Tokyo Inc.
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Tomiki Tetsuhiko
Matsushita Research Institute Tokyo
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