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Related Experiment Videos

Multiple solutions in data fitting: a trap in EXAFS structural analysis and some ideas to avoid it.

A Michalowicz1, G Vlaic

  • 1Department of Physics, University of Paris XII, 61 Avenue De Gaulle, 94010 Creteil, France.

Journal of Synchrotron Radiation
|May 12, 2006
PubMed
Summary
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This study identifies a key error source in Extended X-ray Absorption Fine Structure (EXAFS) multishell data analysis. It highlights potential inaccuracies in determining interatomic distances, especially with complex atomic interactions.

Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Extended X-ray Absorption Fine Structure (EXAFS) is a powerful technique for determining local atomic structure.
  • Accurate interatomic distance determination is crucial for understanding material properties.
  • Multishell EXAFS data analysis can be complex and prone to errors.

Purpose of the Study:

  • To describe a potential source of error in interatomic distance determination during EXAFS multishell data analysis.
  • To investigate this error using simulated and experimental EXAFS signals.
  • To discuss the origin of this specific type of error.

Main Methods:

  • Simulated EXAFS signal generation for a cluster of Rhodium (Rh) atoms interacting with Oxygen (O) atoms.

Related Experiment Videos

  • Fitting of the simulated EXAFS signal to identify potential errors.
  • Analysis of an experimental EXAFS signal using similar fitting procedures.

    • Main Results:

    • A specific error source affecting interatomic distance determination in multishell EXAFS data was identified.
    • The fitting of simulated data revealed discrepancies related to the interaction between Rh and O atoms.
    • The analysis of experimental data corroborated the findings from the simulated signal.

    Conclusions:

    • The study highlights a critical consideration for accurate EXAFS data analysis, particularly in multishell systems.
    • Understanding this error source is essential for reliable interatomic distance measurements.
    • This work contributes to improving the precision of EXAFS-based structural analysis.