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Volcano structure in atomic resolution core-loss images.

A J D'Alfonso1, S D Findlay, M P Oxley

  • 1School of Physics, University of Melbourne, Victoria 3010, Australia.

Ultramicroscopy
|December 14, 2007
PubMed
Summary
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The common volcano structure in electron microscopy images breaks down with larger apertures. Higher-order terms are needed for accurate simulations of electron energy loss spectroscopy (EELS) in materials.

Area of Science:

  • Materials Science
  • Physics
  • Electron Microscopy

Background:

  • Simulations of atomic resolution electron energy loss spectroscopy (EELS) in scanning transmission electron microscopy (STEM) often show a volcano or donut structure.
  • Previous understanding relied on a geometrical perspective using a dipole approximation.

Purpose of the Study:

  • Investigate the breakdown of the dipole approximation in EELS core-loss spectroscopy.
  • Quantitatively understand volcano structure formation by including higher-order terms.
  • Explore mechanisms of volcano formation in single atoms and crystals.

Main Methods:

  • Utilizing simulations of atomic resolution EELS.
  • Applying higher-order term inclusion beyond the dipole approximation.
  • Testing with cubic SrTiO3 crystal simulations.

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Main Results:

  • The dipole approximation for core-loss spectroscopy breaks down as the probe-forming aperture semi-angle increases.
  • Higher-order terms are necessary for a quantitative understanding of volcano formation.
  • Nonlocality, probe channelling, and absorption effects contribute to volcano structures in crystal images.

Conclusions:

  • The study provides a more accurate model for volcano structure formation in EELS.
  • Understanding these effects is crucial for interpreting atomic-resolution STEM-EELS data from materials.