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Correcting for probe wandering by precession path segmentation.

Gregory Nordahl1, Lewys Jones2, Emil Frang Christiansen1

  • 1Department of Physics, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway.

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|March 16, 2023
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Summary
This summary is machine-generated.

A new method improves scanning precession electron diffraction by segmenting the precession path. This enhances image resolution and reduces probe wandering, simplifying instrument alignment.

Keywords:
AberrationsAlignmentElectron diffractionPrecession

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Area of Science:

  • Materials Science
  • Crystallography
  • Electron Microscopy

Background:

  • Precession electron diffraction (PED) is a key technique for materials analysis, offering high reciprocal space resolution.
  • A significant challenge in PED is 'probe wandering,' which degrades spatial resolution in reconstructed images.
  • Existing methods struggle with probe wandering, complicating data acquisition and analysis.

Purpose of the Study:

  • To introduce a novel precession path segmentation methodology for scanning PED.
  • To counteract the detrimental effects of probe wandering on image resolution.
  • To improve the ease of instrument alignment in PED experiments.

Main Methods:

  • Development of a precession path segmentation algorithm.
  • Utilizing fast pixelated electron detector technology to capture multiple frames per azimuthal rotation.
  • Implementing post-acquisition processing for probe wandering correction.

Main Results:

  • Demonstrated significant increase in resolution for reconstructed virtual images.
  • Successfully reduced probe wandering caused by instrument misalignment.
  • Showcased potential for simplifying the complex alignment procedures in PED.

Conclusions:

  • The presented precession path segmentation method effectively enhances spatial resolution in scanning PED.
  • This technique offers a practical solution to mitigate probe wandering, improving data quality.
  • The approach has the potential to make PED more accessible by easing alignment requirements.