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Is precession electron diffraction kinematical? Part II A practical method to determine the optimum precession angle.

A S Eggeman1, T A White, P A Midgley

  • 1Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK. ase25@cam.ac.uk

Ultramicroscopy
|November 10, 2009
PubMed
Summary

Optimizing precession angles in electron diffraction is crucial. Larger angles minimize dynamical diffraction effects, improving the accuracy of crystal structure determination, especially for materials like erbium pyrogermanate.

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Area of Science:

  • Crystallography
  • Materials Science
  • Electron Microscopy

Background:

  • Dynamical diffraction effects can complicate the interpretation of electron diffraction data.
  • Understanding the kinematical nature of diffraction is essential for accurate structure determination.

Purpose of the Study:

  • To investigate the optimal precession angle for electron diffraction data acquisition.
  • To assess the impact of dynamical diffraction on structure solution algorithms.
  • To minimize multi-beam conditions and enhance kinematical scattering.

Main Methods:

  • Experiments using silicon and erbium pyrogermanate.
  • Systematic variation of precession angles in electron diffraction.
  • Analysis of kinematically forbidden reflections.
  • Comparison of experimental data with theoretical kinematical structure factor phases.

Main Results:

  • Larger precession angles were found to minimize multi-beam conditions and reduce dynamical diffraction.
  • Small precession angles negatively impacted the kinematical nature of low-order reflections.
  • A strong correlation was observed between stable relative intensities and accurate structure factor phases.

Conclusions:

  • The choice of precession angle significantly influences the quality of electron diffraction data.
  • Optimized precession angles are critical for obtaining reliable crystal structure solutions.
  • This study provides a method for selecting optimal precession angles to improve structural analysis.