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Hole counts from X-ray absorption spectra.

A L Ankudinov1, A I Nesvizhskii, J J Rehr

  • 1Dept. of Physics, University of Washington, Seattle 98195-1560, USA. alex@phys.washington.edu

Journal of Synchrotron Radiation
|August 22, 2001
PubMed
Summary

Renormalized-atom and cellular counts offer superior characterization of electron states from X-ray absorption spectra. A new projection-operator method quantitatively determines these hole counts, improving electronic structure analysis.

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Area of Science:

  • Solid-state physics
  • Quantum chemistry
  • Materials science

Background:

  • Interpreting X-ray absorption spectra (XAS) for electronic structure is crucial.
  • Traditional methods use free-atom or Mülliken counts, which have limitations.

Purpose of the Study:

  • To introduce a more accurate method for characterizing occupied electron states using XAS.
  • To provide a quantitative approach for determining hole counts in molecules and condensed matter.

Main Methods:

  • A projection-operator approach is developed to isolate localized electronic states.
  • Multiple-scattering theory (MST) and atomic calculations are employed.
  • Relating XAS to local projected densities of states (LDOS) through a smooth transformation.

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Main Results:

  • Renormalized-atom (RA) and cellular counts are identified as more suitable than traditional methods.
  • The projection-operator approach successfully subtracts delocalized states.
  • Theoretical tests on transition metals demonstrate the approach's effectiveness for s and d electrons.

Conclusions:

  • The developed method provides a quantitative and accurate determination of hole counts from XAS.
  • This approach enhances the understanding of electronic configurations in various materials.
  • RA and cellular counts are recommended for detailed electronic structure analysis via XAS.