Energy Loss Structure in X-Ray Photoemission Spectra of Single Crystalline LiNbO3,LiTaO3,MgO and α-Al2O3

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  • Kohiki Shigemi
    Nagaoka University of Technology, Technology Development Center, Nagaoka, Niigata 940–21, Japan National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki 305, Japan
  • Fukushima Sei
    National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki 305, Japan
  • Yoshikawa Hideki
    National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki 305, Japan
  • Arai Masao
    National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki 305, Japan

書誌事項

タイトル別名
  • Energy Loss Structure in X-Ray Photoemission Spectra of Single Crystalline LiNbO3, LiTaO3, MgO and .ALPHA.-Al2O3.
  • Energy Loss Structure in X-Ray Photoemi
  • Energy Loss Structure in X-Ray Photoemission Spectra of Single Crystalline LiNbO<sub>3</sub>, LiTaO<sub>3</sub>, MgO and α-Al<sub>2</sub>O<sub>3</sub>

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抄録

The energy loss structure in X-ray photoemission spectra was studied in detail for complicated band structure systems ( LiNbO3 and LiTaO3) and simple band structure systems (MgO and α - Al2O3). The energy loss structure on the lower kinetic energy side of core lines can be approximated by a sum of four components. The narrower peaks positioned at 7.0, 12.0 and 14.5 eV for LiNbO3, those at 8.0, 13.4 and 15.8 eV for LiTaO3, those at 11.3, 15.3 and 18.3 eV for MgO, and that at 14.5 eV for α - Al2O3 were assigned to interband transitions from the valence to the conduction bands. The peak positioned at 35.3 eV for α - Al2O3 was assigned to interband transition from the O2s level to the conduction band. The broader peaks positioned at 21.8 eV for LiNbO3, 22.6 eV for LiTaO3, 23.2 eV for MgO, and 25.2 eV for α - Al2O3 were ascribed to the single loss of the bulk plasmon excitation. The peak positioned at 49.9 eV for α - Al2O3 was ascribed to the double losses of the plasmon excitation. The observed plasmon energies are larger than the estimated one in the free electron gas model for each substance (10 eV for the complicated and 1 eV for the simple systems).

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