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Related Experiment Videos

Multiple-electron excitation in X-ray absorption: a simple generic model.

M Roy1, J D Lindsay, S Louch

  • 1Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK. mr6@leicester.ac.uk

Journal of Synchrotron Radiation
|August 7, 2001
PubMed
Summary
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This study introduces a simple model to calculate multiple-electron excitations during X-ray absorption. The model accurately predicts the extended X-ray absorption fine structure (EXAFS) amplitude reduction factor and its energy dependence, aligning well with experimental data.

Area of Science:

  • Atomic and Molecular Physics
  • X-ray Spectroscopy
  • Quantum Mechanics

Background:

  • Multiple-electron excitations are a complex phenomenon in X-ray absorption spectroscopy.
  • Accurate theoretical models are needed to interpret experimental data, particularly for extended X-ray absorption fine structure (EXAFS).

Purpose of the Study:

  • To develop a simple, generic model for calculating the probability of multiple-electron excitations in X-ray absorption.
  • To assess the model's accuracy for predicting the EXAFS amplitude reduction factor and its energy dependence.
  • To determine the impact of multiple-electron excitations on the overall X-ray absorption coefficient.

Main Methods:

  • A simple generic model was employed for calculating multiple-electron excitation probabilities.

Related Experiment Videos

  • The 'sudden approximation' using Slater orbitals was used to determine the high-energy limit (EXAFS amplitude reduction factor).
  • A model form of perturbing potential was utilized to calculate the energy dependence of the excitation probability.

    • Main Results:

    • The model successfully calculated the EXAFS amplitude reduction factor, showing good agreement with experimental results.
    • The calculated energy dependence of multiple-electron excitation probability also demonstrated strong agreement with experimental data for rare gas atoms.
    • The inclusion of multiple-electron excitations was found to have a minimal effect on the X-ray absorption coefficient, consistent with observations.

    Conclusions:

    • The developed simple generic model provides an efficient and accurate method for calculating multiple-electron excitations in X-ray absorption.
    • The model's predictions for EXAFS amplitude reduction and energy dependence are validated by experimental data.
    • Multiple-electron excitations have a minor but quantifiable impact on X-ray absorption coefficients.