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Title: Soft x-ray appearance potential spectroscopy study of MgO (100) and α-Al{sub 2}O{sub 3} (100) single crystals

Soft x-ray appearance potential spectroscopy (SXAPS) measurements was used to measure on MgO (100) and α-Al{sub 2}O{sub 3} (100) single crystals. Mg 1s, Al 1s, and O 1s SXAPS self-deconvoluted (SD) spectra were obtained. The features of the Mg 1s and O1s SD spectra are in fair agreement with those of the near-edge x-ray absorption fine structure spectra for an MgO thin film (3 ML) on Ag (100). This suggests that the SXAPS spectra reflect electronic states of the relaxed MgO (100) surface. The features of the Al 1s and O 1s SD spectra are in qualitative agreement with those of the electron energy-loss spectroscopy. The SXAPS SD spectra are discussed in terms of antibonding states and partial density of empty states obtained by theoretical calculations for MgO and α-Al{sub 2}O{sub 3,} respectively. The present result suggests that the “approximate dipole selection rule” is applicable to the SXAPS spectra of MgO and α-Al{sub 2}O{sub 3}, as well as 3d transition metal oxides.
Authors:
; ; ;  [1]
  1. Research Institute of Electronics, Shizuoka University, Johoku 3-5-1, Naka-ku, Hamamatsu 432-8011 (Japan)
Publication Date:
OSTI Identifier:
22258787
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films; Journal Volume: 31; Journal Issue: 6; Other Information: (c) 2013 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM OXIDES; ELECTRONS; ENERGY-LOSS SPECTROSCOPY; FINE STRUCTURE; MAGNESIUM OXIDES; MONOCRYSTALS; POTENTIALS; SILVER 100; SOFT X RADIATION; SPECTRA; THIN FILMS; TRANSITION ELEMENTS; X-RAY SPECTROSCOPY