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Atom-column distinction by Kikuchi pattern observed by an aberration-corrected convergent electron probe
Journal of Electron Microscopy
|April 27, 2010
Summary
Investigating Kikuchi patterns in MgO crystals revealed that the 111 band
Area of Science:
- Materials Science
- Solid-State Physics
- Electron Microscopy
Background:
- Kikuchi patterns are formed by electron diffraction in crystalline materials.
- Previous studies have not detailed beam-position dependent intensity variations in MgO Kikuchi patterns.
Discussion:
- Observed contrast reversal in the MgO 111 Kikuchi band depends on the illuminated atom-column.
- This phenomenon was reproduced using multislice simulations with the frozen-phonon approach.
- Electron channelling and the reciprocity theorem explain the beam-position dependence.
Key Insights:
- The 111 Kikuchi band exhibits anomalous contrast reversal based on the illuminated atom-column.
- This anomalous behavior is sensitive to the precise location of the electron beam.
- The findings demonstrate a novel method for atomic column identification.
Outlook:
- Anomalous Kikuchi patterns can serve as a probe for identifying illuminated atom columns.
- This technique is valuable for advanced analytical methods like column-by-column electron energy-loss spectroscopy and X-ray emission spectroscopy.
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