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Related Experiment Videos

Practical procedure for coma-free alignment using caustic figure.

Koji Kimoto1, Kazuo Ishizuka, Nobuo Tanaka

  • 1Advanced Materials Laboratory, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, Japan. kimoto.koji@nims.go.jp

Ultramicroscopy
|April 4, 2003
PubMed
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This study introduces a simple method for coma-free alignment in transmission electron microscopy (TEM) using a single defocused image. The technique precisely aligns the beam, significantly reducing misalignment errors without complex procedures.

Area of Science:

  • Materials Science
  • Physics
  • Electron Microscopy

Background:

  • Accurate beam alignment is crucial for high-resolution imaging in transmission electron microscopy (TEM).
  • Previous coma-free alignment methods often require complex procedures, specific specimens, or advanced image processing techniques.
  • Residual beam tilt and coma aberrations limit achievable resolution in TEM.

Purpose of the Study:

  • To present a practical and simplified procedure for coma-free alignment in TEM.
  • To demonstrate the effectiveness of using caustic figures in defocused images for alignment.
  • To reduce beam tilt misalignment to the sub-mrad order.

Main Methods:

  • Utilizing caustic figures observed in a single defocused transmission electron microscopy (TEM) image of a focused probe.

Related Experiment Videos

  • Aligning the beam by coinciding the bright-field spot with the center of a caustic curve in an underfocused image.
  • Detecting residual coma aberration using multiple Bragg images of a known crystal.

    • Main Results:

    • Achieved beam tilt misalignment reduction to the sub-mrad order (e.g., 0.3 mrad for 300kV FEG-TEM).
    • Eliminated the need for intentional beam tilting, amorphous specimens, high-resolution TEM images, or fast Fourier transform (FFT) analysis.
    • Provided a straightforward method for precise electron beam alignment.

    Conclusions:

    • The presented method offers a practical and efficient approach to coma-free alignment in TEM.
    • This technique simplifies the alignment process, making high-resolution imaging more accessible.
    • The method's effectiveness is validated by achieving sub-mrad beam tilt precision and detecting residual coma aberrations.