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Related Experiment Video

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Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments

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A method to determine the local surface profile from reconstructed exit waves.

A Wang¹, F R Chen, S Van Aert

¹Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. amy.wang@ua.ac.be

Ultramicroscopy

|August 26, 2011

Summary

This study investigates how defocus affects electron wave delocalization in atomic-scale imaging. Understanding this delocalization is key to accurately quantifying atomic structure parameters and surface roughness.

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Area of Science:

Materials Science
Physics
Electron Microscopy

Background:

Reconstructed exit waves are crucial for atomic-scale structure determination.
Current methods reconstruct waves in a plane near the atom column exit, susceptible to surface deviations.

Purpose of the Study:

To systematically study wave delocalization with defocus using channelling theory.
To improve the accuracy of atomic-scale structure and surface roughness quantification.

Main Methods:

Application of channelling theory to analyze defocus offset.
Investigating the impact of reconstruction plane choice on wave delocalization.
Systematic study of delocalization phenomena.

Main Results:

Defocus offset can be determined atom column-by-atom column, enabling surface roughness quantification.
Reconstruction plane choice significantly impacts wave delocalization and interpretation.
Distant reconstruction planes lead to delocalized and interfering waves, complicating structural analysis.

Conclusions:

Accurate quantification of atomic structure and surface roughness requires careful consideration of defocus and reconstruction plane.
Channelling theory provides a framework for understanding and mitigating delocalization effects in electron microscopy.