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Differential phase contrast from electrons that cause inner shell ionization.

Michael Deimetry1, Timothy C Petersen2, Hamish G Brown3

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This summary is machine-generated.

Differential Phase Contrast (DPC) imaging using core-loss electrons offers new insights. This method, while requiring high doses, provides robust imaging for thicker samples and preserves elastic contrast.

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4D STEMDifferential phase contrastInner shell ionization

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Area of Science:

  • Electron Microscopy
  • Materials Science
  • Spectroscopy

Background:

  • Differential Phase Contrast (DPC) imaging is typically studied with elastic scattering.
  • Core-loss scattered electrons result from inner shell ionization.
  • Understanding inelastic DPC is crucial for advanced microscopy.

Purpose of the Study:

  • To investigate DPC formed from core-loss scattered electrons.
  • To analyze the role of transition potentials and final states in calculations.
  • To determine the conditions for element-selective contrast in inelastic DPC.

Main Methods:

  • Utilizing a transition potential approach for core-loss electron scattering.
  • Applying the phase object approximation.
  • Conducting simulations to analyze contrast mechanisms and delocalization effects.

Main Results:

  • Inelastic DPC is primarily due to preserved elastic contrast.
  • Element selectivity in inelastic DPC depends on ionization interaction range and energy loss.
  • Incoherent inelastic wavefields allow for robust interpretation in thicker samples compared to elastic DPC.

Conclusions:

  • Inelastic DPC is achievable for thicker samples due to wavefield incoherence.
  • High electron doses are necessary for discernible contrast.
  • Signal-to-noise ratio improves with sample thickness, enhancing feasibility.