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Related Experiment Videos

Nonlinear imaging using annular dark field TEM.

S Bals1, R Kilaas, C Kisielowski

  • 1National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA. sara.bals@ua.ac.be

Ultramicroscopy
|July 6, 2005
PubMed
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Annular dark field transmission electron microscopy (TEM) reveals mass-thickness contrast for single atom analysis. Lattice fringes with a nonlinear information limit of 1.2Å were observed and explained by nonlinear imaging theory.

Area of Science:

  • Materials Science
  • Electron Microscopy
  • Nanotechnology

Background:

  • Annular dark field (ADF) transmission electron microscopy (TEM) is crucial for materials characterization.
  • Mass-thickness contrast in ADF-TEM images is typically dominant and can be quantified.
  • Extracting single atom scattering cross-sections requires high-resolution imaging techniques.

Purpose of the Study:

  • To investigate the origin and characteristics of lattice fringes observed in ADF-TEM images.
  • To quantify single atom scattering cross-sections using mass-thickness contrast.
  • To evaluate the role of nonlinear imaging phenomena in high-resolution TEM.

Main Methods:

  • Acquisition of annular dark field transmission electron microscopy (ADF-TEM) images at 150 kV.

Related Experiment Videos

  • Application of coherent nonlinear imaging theory to analyze image formation.
  • Comparison of experimental images with simulated images based on theoretical models.
  • Quantification of mass-thickness contrast for single atom scattering cross-section extraction.

    • Main Results:

    • ADF-TEM images showed dominant mass-thickness contrast, enabling quantification for single atom analysis.
    • Additional lattice fringes were observed, exhibiting a nonlinear information limit of 1.2 Å.
    • Coherent nonlinear imaging theory accurately described the formation of these lattice fringes.
    • Experimental and simulated images demonstrated good agreement, validating the theoretical model.

    Conclusions:

    • Mass-thickness contrast in ADF-TEM is a viable method for single atom scattering cross-section quantification.
    • Lattice fringe formation in ADF-TEM is influenced by nonlinear imaging effects.
    • Aberration-corrected microscopes are predicted to significantly enhance image quality for atomic resolution imaging.