Multi-modal and multi-scale non-local means method to analyze spectroscopic datasets

Multi-modal and multi-scale non-local means method to analyze spectroscopic datasets

A multi-modal and multi-scale non-local means (M3S-NLM) method is proposed to extract atomically resolved spectroscopic maps from low signal-to-noise (SNR) datasets recorded with a transmission electron microscope. This method improves upon previously tested denoising techniques as it takes into acc...

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Bibliographic Details
Main Authors: Mevenkamp, Niklas, MacArthur, Katherine E., Tileli, Vasiliki, Ebert, Philipp, Allen, Leslie J., Berkels, Benjamin, Duchamp, Martial
Other Authors: School of Materials Science and Engineering
Format: Journal Article
Language:English
Published: 2022
Subjects:
Engineering::Materials
Perovskite
Semiconductor Alloys
Online Access:https://hdl.handle.net/10356/155491
Description
Summary:A multi-modal and multi-scale non-local means (M3S-NLM) method is proposed to extract atomically resolved spectroscopic maps from low signal-to-noise (SNR) datasets recorded with a transmission electron microscope. This method improves upon previously tested denoising techniques as it takes into account the correlation between the dark-field signal recorded simultaneously with the spectroscopic dataset without compromising on the spatial resolution. The M3S-NLM method was applied to electron energy dispersive X-ray and electron-energy-loss spectroscopy (EELS) datasets. We illustrate the retrieval of the atomic scale diffusion process in an Al1-xInxN alloy grown on GaN and the surface oxidation state of perovskite nanocatalysts. The improved SNR of the EELS dataset also allows the retrieval of atomically resolved oxidation maps considering the fine structure absorption edge of LaMnO3 nanoparticles.

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