On the alignment for precession electron diffraction

Yifeng Liao*, Laurence D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Precession electron diffraction has seen a fast increase in its adoption as a technique for solving crystallographic structures as well as an alternative to conventional selected-area and converged-beam diffraction methods. One of the key issues of precession is the pivot point alignment, as a stationary apparent beam does not guarantee a fixed pivot point. A large precession tilt angle, along with pre-field and post-field misalignment, induces shift in the image plane. We point out here that the beam should be aligned to the pre-field optic axis to keep the electron illumination stationary during the rocking process. A practical alignment procedure is suggested with the focus placed on minimizing the beam wandering on the specimen, and is demonstrated for a (110)-oriented silicon single crystal and for a carbide phase (~20. nm in size) within a cast cobalt-chromium-molybdenum alloy.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalUltramicroscopy
Volume117
DOIs
StatePublished - Jun 1 2012

Keywords

  • Alignment
  • CoCrMo alloy
  • M C carbide
  • Precession electron diffraction

ASJC Scopus subject areas

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

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