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A New and Unexpected Spatial Relationship Between Interaction Volume and Diffraction Pattern in Electron Microscopy

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Summary
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Lateral subsections of electron microscopy interaction volumes create Kikuchi diffraction pattern subsections. This reveals sample microstructure directly in Kikuchi patterns, offering new insights for materials science.

Keywords:
Monte Carlo simulationdiffraction patternelectron microscopyinteraction volumetransmission Kikuchi diffraction

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Area of Science:

  • Materials Science
  • Physics
  • Electron Microscopy

Background:

  • Transmission electron microscopy (TEM) is crucial for materials characterization.
  • Kikuchi patterns provide crystallographic information but typically represent bulk sample properties.
  • Direct visualization of microstructure within Kikuchi patterns has been a challenge.

Purpose of the Study:

  • To investigate the lateral ordering of the electron beam interaction volume in TEM.
  • To demonstrate that lateral subsections of this volume generate corresponding subsections of the Kikuchi diffraction pattern.
  • To establish a method for directly visualizing sample microstructure within Kikuchi patterns.

Main Methods:

  • Utilized an on-axis transmission Kikuchi diffraction setup in a scanning electron microscope.
  • Performed Monte Carlo simulations to model electron scattering.
  • Conducted large-angle convergent-beam electron diffraction experiments.
  • Analyzed Kikuchi patterns across a fabricated silicon interface.

Main Results:

  • Demonstrated lateral ordering within the electron beam interaction volume.
  • Showed that lateral subsections of the interaction volume produce Kikuchi pattern subsections.
  • Observed direct visualization of polycrystalline Ti-10Al-25Nb microstructure in Kikuchi patterns.
  • Achieved good qualitative agreement between experiments and simulations.

Conclusions:

  • The lateral ordering of the interaction volume allows for direct microstructural imaging within Kikuchi patterns.
  • The phenomenon originates from differential elastic and quasi-elastic cross-sections.
  • Discrepancies between simulation and experiment may stem from thermal diffuse scattering effects.