Solving peak overlaps for proximity histogram analysis of complex interfaces for atom probe tomography data

TL;DR

This paper introduces a method to correct peak overlaps in atom probe tomography data at interfaces using isotope abundances, enhancing resolution and accuracy in nanostructure analysis.

Contribution

It presents a novel correction technique for peak overlaps at interfaces, integrated into the EPOSA software, improving analysis of complex nanostructures.

Findings

Achieved proximity histogram resolution up to 0.1 nm

Demonstrated effectiveness of isotope-based correction at interfaces

Enhanced peak overlap solving with maximum likelihood algorithm

Abstract

Atom probe tomography is a powerful tools in investigating nanostructures such as interfaces and nanoparticles in material science. Advanced analysis tools are particularly useful for analyzing these nanostructures characterized very often by curved shapes. However, these tools are very limited for complex materials with non-negligible peak overlaps in their respective mass-to-charge ratio spectra. Usually, an analyst solves peak overlaps in the bulk regions but the behavior at interfaces is rarely considered. Therefore, in this work we demonstrate how the proximity histogram generated for a specific interface can be corrected by using the natural abundances of isotopes. This leads to overlap-solved proximity histograms with a resolution of up to 0.1 nm. This work expands on previous work that showed the advantage of a maximum likelihood peak overlap solving. The corrected proximity histograms together with the maximum likelihood peak overlap algorithm were implemented in an user-friendly software suite called EPOSA.