Optical Studies of Alkali Fluorides and Alkaline Earth Fluorides in VUV Region
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概要
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The results of a series of reflectivity and absorption measurements performed to clarify respectively the excitonic transitions in the intrinsic region to 13.5 eV and the thermal and spectral dependences of absorptions in the tail region of LiF, NaF, KF, CaF_2 SrF_2 and BaF_2, each being cleaved from Harshaw blocks of single crystal, are presented. The tails of Harshaw LiF, being expressed by exponential functions of energy in the range of 10^0 cm^<-1>≲A≲5・10^2 cm^<-1> and 300°K<__-T<__-573°K, have turned out to be extrinsic to LiF. The present experiments could not provide sufficiently conclusive evidences in clarifying the question whether the tails of Harshaw alkaline earth fluorides, to Urbach rule is applicable for the range of 10^0 cm^<-1>&lim;A≲10^2 cm^<-1> and 78°K<__-T<__-573°K, are intrinsic. In the latter, the lower energy lying doublet was identified with the Γ-exciton (fluorine doublet) and the remaining triplet with the X-excitons. The apparent doublet in the first peak in CaF_2 is inferred to result from the unresolved quintet lines. The oscillator strengths for the first peak as a whole were estimated by means of Kramers-Kroning transform of reflectivity spectra: they are 0.52 for CaF_2, 0.47 for SrF_2 and 0.44 for BaF_2.
- 社団法人日本物理学会の論文
- 1969-09-05
著者
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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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