# Simultaneous multi-region background subtraction for core-level EEL spectra

## TL;DR

This paper introduces a multi-region background subtraction method for core-level EEL spectra that enhances robustness and consistency by fitting multiple regions simultaneously, improving spectral analysis accuracy.

## Contribution

It extends standard power-law background subtraction to multiple regions, enabling simultaneous fitting of pre- and post-edge areas for more reliable background removal.

## Key findings

- Improved robustness of background subtraction in EEL spectra.
- Consistent background removal across multiple edges.
- Enhanced stability with respect to fitting window variations.

## Abstract

We present a multi-region extension of standard power-law background subtraction for core-level EEL spectra to improve the robustness of background removal. This method takes advantage of the post-edge shape of core-loss EEL edges to enable simultaneous and co-dependent fitting of pre- and post-edge background regions. This method also produces simultaneous and consistent background removal from multiple edges in a single EEL spectrum. The stability of this method with respect to the fitting energy window is also discussed.