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Characterizing probe performance in the aberration corrected STEM.

P E Batson1

  • 1IBM Thomas J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY 10598, USA. batson@us.ibm.com

Ultramicroscopy
|July 28, 2006
PubMed
Summary
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Sub-Angstrom imaging with the 120 kV IBM Scanning Transmission Electron Microscope (STEM) is achievable. Understanding contrast requires multislice simulations, and atomic movement under the electron beam offers insights into processes.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electron Microscopy

Background:

  • Sub-Angstrom resolution in Scanning Transmission Electron Microscopy (STEM) is critical for atomic-scale characterization.
  • Accurate interpretation of STEM images necessitates advanced computational methods.

Purpose of the Study:

  • To demonstrate routine sub-Angstrom imaging using a 120 kV IBM STEM system.
  • To highlight the importance of multislice simulations for understanding Annular Dark Field (ADF) contrast.
  • To investigate atomic behavior under electron beam irradiation.

Main Methods:

  • Utilized a 120 kV IBM STEM for high-resolution imaging.
  • Employed multislice simulations with frozen phonon approximation for image analysis.
  • Analyzed silicon dumbbell structures in [110] and [211] projections.

Related Experiment Videos

  • Implemented fast image acquisition techniques.

    • Main Results:

    • Achieved routine sub-Angstrom imaging with careful probe optics control and characterization.
    • Demonstrated that multislice simulations are essential for interpreting ADF contrast.
    • Observed ubiquitous atomic movement under the electron beam during fast imaging.

    Conclusions:

    • Sub-Angstrom STEM imaging is a practical technique with proper setup.
    • Accurate image interpretation relies on sophisticated simulation methods.
    • Electron beam-induced atomic dynamics can provide valuable information on atomic-level processes.