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Low-Energy Electron Inelastic Mean Free Path of Copper.

Daniel Sier1, Jay D Bourke2, Christopher T Chantler2

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|February 20, 2026
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Summary
This summary is machine-generated.

This study introduces a novel method for measuring electron inelastic mean free path (IMFP) in copper using X-ray absorption fine structure (XAFS). The findings highlight discrepancies in current IMFP data, impacting XAFS analysis accuracy.

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Area of Science:

  • Materials Science
  • Surface Science
  • Spectroscopy

Background:

  • Accurate electron inelastic mean free path (IMFP) is crucial for X-ray absorption fine structure (XAFS) modeling and Monte Carlo transport.
  • Discrepancies exist between theoretical and experimental IMFP values, questioning the reliability of structural parameters derived from XAFS.
  • Small molecules and organometallic systems are particularly affected by IMFP inconsistencies due to limited scattering data.

Purpose of the Study:

  • To present a new method for measuring electron IMFP in copper metal.
  • To address the limitations of current theoretical IMFP determinations at low energies.
  • To resolve discrepancies in IMFP data affecting XAFS analysis.

Main Methods:

  • Measurement of electron IMFP from K-edge X-ray absorption fine structure (XAFS) of copper.
  • Utilized energies ranging from 5 to 320 eV above the edge.
  • Employed an advanced density functional theory (DFT) core with the finite difference method for XAFS (FDMX).

Main Results:

  • The developed method provides experimental IMFP measurements consistent with previous studies and plasmon theory.
  • The study reveals that multiple-scattering approaches using muffin-tin potentials are insufficient for accurate fine structure calculations.
  • Temperature variations in measurements indicate the need for fine spacing and uncertainty quantification at low temperatures, suggesting significant temperature-dependent effects.

Conclusions:

  • The new method offers a reliable approach for experimental IMFP determination.
  • This work validates recent experimental and theoretical findings while identifying new challenges in IMFP research.
  • Understanding temperature-dependent effects on IMFP is essential for accurate XAFS analysis.