Anisotropic Optical Spectra of YAlO_3 (YAP) Single Crystals in the Vacuum Ultraviolet Region. III. Spectra of Optical Constants

概要

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The Kramers-Kronig derived complex dielectric constant, energy loss functions and effective number of electrons of YAP are presented in the region of 6 eV〜120 eV for the light polarized parallel to each of the three crystallographic axes. The peak value of ε_2 spectrum at 33.34 eV, the highest-energy component of the bands associated with five resonance transitions from the Y^<3+>4p^6 level, is found to be proportional to the site number of Y^<3+>/cm^3 in the lattices of YAG, YAP and Y_2O_3. The maxima due to plasma oscillations are derived at 〜23 eV and 〜36 eV in each volume loss function. The energy dependence of the dielectric constant is found to be in substantial agreement in the region of 50 eV〜120 eV with that calculated by the Drude formula with the use of the peak energy and half value width of the loss maximum at 〜36 eV. The above continuum is superposed on the features led by doublet lines at 78.4 eV and 78.8 eV which originate from the transitions from the Al^<3+>L_<2, 3> levels.
社団法人日本物理学会の論文
1994-06-15