A menu of electron probes for optimising information from scanning transmission electron microscopy

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Abstract

We assess a selection of electron probes in terms of the spatial resolution with which information can be derived about the structure of a specimen, as opposed to the nominal image resolution. Using Ge [001] as a study case, we investigate the scattering dynamics of these probes and determine their relative merits in terms of two qualitative criteria: interaction volume and interpretability. This analysis provides a ‘menu of probes’ from which an optimum probe for tackling a given materials science question can be selected. Hollow cone, vortex and spherical wave fronts are considered, from unit cell to Angstrom size, and for different defocus and specimen orientations.
Original languageEnglish
Pages (from-to)143-155
Number of pages13
JournalUltramicroscopy
Volume184
Issue numberPart A
DOIs
Publication statusPublished - 2018

Keywords

  • ADF-STEM
  • Information resolution
  • Interpretability
  • Electron probe
  • Channelling

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