Optical Spectra of Cadminm Halide Crystals in 3-30 eV Region

概要

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Reflection spectra of single crystals of CdCl., CdBr. and Cdl. at 35 K weremeasured in the region up to 30 eV using synchrotron radiation. Photoemission experiments were also performed on in-situ evaporated films of cadmium halides todetermine binding energies of the outermost ,v-core levels of halogen ions. Optical conslants were derived through Kramers-Kronig analysis. In the region up to 15 eV werefound a number of peaks which are attributed to the transitions from the halogenvalence band to the cadmium 5,s' and 5p conduction bands. Around 16 eV were ob-served the peaks due to the Cd 4d core excitons. Weak structures in the 19-24 eVregion are assigned to the transitions from the halogen .s-core levels. In Cdl., it wasfound that the total oscillator strength for the transition from the valence band isenhanced due to the presence of shallow core levels.[cadmium halides, reflection spectra, optical constants, photoemission spectra, ll energy band structure, core exciton, oscillator strength, sum rulel
社団法人日本物理学会の論文
1990-01-15