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Expanding the Dimensions of a Small, Two-Dimensional Diffraction Detector.

Xi Chen1, Matthew R Hauwiller1, Abinash Kumar1

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA02139, USA.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
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Summary

We developed a method to increase the pixel count of electron detectors by stitching together diffraction pattern subsections. This technique expands the field of view for electron microscopy pixel array detectors (EMPADs) without sacrificing data quality.

Keywords:
diffuse scatteringdirect electron cameraselectron diffractionhigh dynamic range

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Area of Science:

  • Materials Science
  • Electron Microscopy
  • Crystallography

Background:

  • Small, two-dimensional electron detectors in electron microscopy have limited pixel counts, restricting their field of view and reciprocal-space sampling.
  • Electron microscopy pixel array detectors (EMPADs) offer high sensitivity but are constrained by their native resolution.

Purpose of the Study:

  • To present a novel approach for expanding the effective pixel count of low-pixel-count electron detectors.
  • To demonstrate enhanced field of view and reciprocal-space sampling in electron diffraction experiments.

Main Methods:

  • Acquiring subsections of a diffraction pattern using a low-pixel-count detector.
  • Accurately stitching these subsections together in post-processing.
  • Accounting for detector rotation and non-orthonormal diffraction shift axes for precise reconstruction.

Main Results:

  • Successfully expanded the field of view of a 128 × 128 pixel electron microscopy pixel array detector (EMPAD).
  • Achieved high reciprocal-space sampling, enabling detailed analysis of diffraction patterns.
  • Demonstrated accurate reconstruction by accounting for detector position and diffraction geometry.

Conclusions:

  • The proposed stitching method effectively increases the usable pixel density of electron detectors.
  • This approach is crucial for obtaining high-resolution diffraction data from limited-pixel detectors.
  • Accurate reconstruction requires careful consideration of detector orientation and diffraction geometry.