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Related Experiment Videos

Deconvolution processing of HAADF STEM images.

K Watanabe1, Y Kotaka, N Nakanishi

  • 1Tokyo Metropolitan College of Technology, Japan.

Ultramicroscopy
|September 6, 2002
PubMed
Summary

Deconvolution processing of high-angle annular dark field scanning transmission electron microscopy images reveals true atomic structures. This method eliminates probe function effects, accurately depicting atomic columns in silicon crystals.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Electron Microscopy

Background:

  • High-angle annular dark field scanning transmission electron microscopy (HAADF STEM) provides atomic-resolution imaging.
  • Image artifacts, such as those from the probe function, can obscure the true atomic structure.
  • Accurate determination of atomic column positions is crucial for understanding material properties.

Purpose of the Study:

  • To apply deconvolution processing to HAADF STEM images of [0 11]-Si.
  • To evaluate the effectiveness of the maximum entropy method in correcting probe function artifacts.
  • To obtain a more accurate representation of the projected atomic structure.

Main Methods:

  • Deconvolution processing using the maximum entropy method was applied to experimental HAADF STEM images.

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  • Images with both unresolved and resolved atomic dumbbells, including artificial bright spots, were analyzed.
  • The processing aimed to remove the influence of the microscope's probe function.

    • Main Results:

    • Deconvoluted images clearly showed bright spots corresponding to projected atomic columns.
    • Artificial bright spots present in the original images were successfully eliminated.
    • The processed images presented a more accurate atomic structure compared to the raw data.

    Conclusions:

    • Deconvolution processing, particularly with the maximum entropy method, effectively corrects probe function artifacts in HAADF STEM images.
    • This technique yields a near-real projected atomic structure, enhancing the reliability of electron microscopy analysis.
    • The method is valuable for precise atomic-level characterization of materials like silicon.