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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 29,
  • Issue 2,
  • pp. 185-189
  • (1975)

Lattice Phonon Spectra of Aluminum Oxide Anodic Films

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Abstract

Techniques have been developed for obtaining reproducible lattice phonon spectra of barrier aluminum oxide anodic films. Changes in the lattice phonon spectrum as a result of 15-keV proton bombardment are interpreted in terms of the formation of Al-OH bonds. Polarization spectra of stripped and unstripped aluminum oxide films confirm the findings of Vedder and Vermilyea, particularly with respect to the origin of the 960 cm<sup>−1</sup> band. The close similarity in the observed and calculated band shapes (using the theory of Berreman) leave little doubt that the 960 cm<sup>−1</sup> absorption is due to a longitudinal optic mode of the aluminum oxide lattice.

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