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Picometer-Precision Atomic Position Tracking through Electron Microscopy
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Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

Decisive factors for realizing atomic-column resolution using STEM and EELS .

Koji Kimoto1, Kazuo Ishizuka, Yoshio Matsui

  • 1National Institute for Materials Science, Ibaraki, Japan. kimoto.koji@nims.go.jp

Micron (Oxford, England : 1993)
|September 13, 2008
PubMed
Summary
This summary is machine-generated.

We achieved atomic-column imaging in silicon nitride using scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS). This technique reveals atomic-site and energy-loss dependencies for high-resolution imaging.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Electron Microscopy

Background:

  • Atomic-resolution imaging is crucial for understanding material properties.
  • Scanning Transmission Electron Microscopy (STEM) and Electron Energy-Loss Spectroscopy (EELS) are powerful techniques for materials characterization.

Purpose of the Study:

  • To demonstrate and elucidate atomic-column imaging capabilities using STEM-EELS.
  • To investigate the factors influencing spatial resolution in atomic-column imaging.

Main Methods:

  • Utilized scanning transmission electron microscopy (STEM) for probe formation and scanning.
  • Employed electron energy-loss spectroscopy (EELS) for elemental and chemical analysis at atomic resolution.
  • Performed multislice calculations to support experimental findings.

Main Results:

  • Successfully resolved silicon atomic columns in a beta-Si3N4 (0 0 1) specimen.
  • Elucidated the atomic-site and energy-loss dependence of spatial resolution.
  • Identified probe channeling and inelastic scattering localization as key factors for atomic-column imaging.

Conclusions:

  • Atomic-column imaging is achievable with STEM-EELS under specific experimental conditions.
  • The local approximation in EELS is valid for high-energy-loss core-loss imaging.
  • Optimized experimental parameters (e.g., energy loss, convergence/collection angles) are critical for high-resolution imaging.