A quantitative analysis of the cone-angle dependence in precession electron diffraction

J. Ciston*, B. Deng, L. D. Marks, C. S. Own, W. Sinkler

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Precession electron diffraction (PED) is a technique which is gaining increasing interest due to its ease of use and reduction of the dynamical scattering problem in electron diffraction. To further investigate the usefulness of this technique, we have performed a systematic study of the effect of precession angle on the mineral andalusite where the semiangle was varied from 6.5 to 32 mrad in five discrete steps. The purpose of this study was to determine the optimal conditions for the amelioration of kinematically forbidden reflections, and the measurement of valence charge density. We show that the intensities of kinematically forbidden reflections decay exponentially as the precession semiangle (φ{symbol}) is increased. We have also determined that charge density effects are best observed at moderately low angles (6.5-13 mrad) even though PED patterns become more kinematical in nature as the precession angle is increased further.

Original languageEnglish (US)
Pages (from-to)514-522
Number of pages9
JournalUltramicroscopy
Volume108
Issue number6
DOIs
StatePublished - May 1 2008

Keywords

  • Bulk charge density
  • Kinematical extinction
  • Multislice simulation
  • Precession electron diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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