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

• Miyata Takeo

  Matsushita Research Institute Tokyo Inc.

• Tomiki Tetsuhiko

  Matsushita Research Institute Tokyo

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• Nanometer Pattern Transfer by VUV Lithography with a D_2 Lamp : Lithography Technology
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• Optical Constants and Exciton States in KCl Single Crystals. I. The Low Temperature Properties
• The UV Reflectivity Spectra of SrF_2 Single Crystals
• Temperature Dependence of the Fundamental Spectra of Potassium-Halides in the Schumann Ultraviolet Region (4.4∼13.5 eV)
• Reflectivity Spectra of KBr and KI Single Crystals in Their Fundamental Region
• The Urbach Tails and Reflection Spectra of NaCl Single Crystals
• Ionic DC-Conductivities of KCl
• Optical Studies on NaCl Crystals
• The UV Reflectivity Spectra of KF, CaF_2 and BaF_2 Single Crystals
• Absorption Edges of NaCl Single Crystal
• The Absorption Edge of KCl
• Optical Constants and Exciton States in KCl Single Crystals : II. The Spectra of Reflectivity and Absorption Constant
• Optical Studies of Alkali Fluorides and Alkaline Earth Fluorides in VUV Region
• Optical Constants and Excition States in KCl Single Crystals. : III. The Spectra of Conductivity and of Energy Loss
• UV Reflection Spectra of KCl Single Crystals
• Exciton Structure of NaI and NaBr

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