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Summary

Atom probe tomography reconstruction artifacts arise from assuming a spherical evaporation surface. A variable projection position method is proposed to improve spatial accuracy in atom probe tomography reconstructions.

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Area of Science:

Materials Science
Nanotechnology
Surface Science

Background:

Standard atom probe tomography (APT) spatial reconstruction methods often introduce artifacts.
These artifacts are frequently linked to the assumption of a perfectly spherical evaporation surface during analysis.

Purpose of the Study:

To investigate the actual shape of the evaporating surface in APT.
To develop and evaluate a novel reconstruction technique to reduce spatial artifacts.
To enhance the accuracy of APT data interpretation, especially for complex material structures.

Main Methods:

Simulated and experimental field evaporation were used to study surface morphology.
A variable point projection position method was implemented in the reconstruction algorithm.
The method was tested on simulated datasets and experimental data from model structures.

Main Results:

The study confirmed deviations from a perfectly spherical evaporation surface.
The variable projection position method demonstrated a reduction in reconstruction artifacts.
Initial results show improved accuracy in reconstructing interfaces between materials with different evaporation fields.

Conclusions:

The assumption of a spherical evaporation surface in APT is a significant source of reconstruction error.
A variable projection position offers a viable strategy to mitigate these artifacts.
This technique holds promise for more accurate 3D reconstructions in APT, particularly for heterogeneous materials.