Optical Spectra of Y_3Al_5O_<12>(YAG) Single Crystals in the Vacuum Ultraviolet Region. II

概要

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The reflectivity spectrum of Y_3Al_5O_<12>(YAG) single crystals at 297 K is presented in the region of 6.734 eV≤E≤116 eV. The spectra of optical constants derived from the reflectivity by the Kramers-Kronig analysis are tentatively interpreted in terms of the energy levels of the constituent atoms of YAG. Plasma resonance peaks are found at 23.3_8 eV and 36.2_0 eV in which the valence-band electrons and valence- as well as full-band electrons participate, respectively. The structure of absorption due to excitations of the electrons in the Al^<3+> L_<2,3>levels is found in the region of E≳76 eV. The free electron-like absorption calculated by the Drude formula by use of the line shape parameters of the plasma resonance line is compared with the dielectric constant in the region of E≳24 eV. The effective optical dielectric constant calculated from the optical constant ε_2 is found to be in good agreement at 116 eV with the optical dielectric constant derived from the dispersion formula.
社団法人日本物理学会の論文
1993-04-15