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Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer

The method deriving the L self-absorption spectrum from Lα,β emission spectra obtained at different accelerating voltages has been optimized for analyzing the chemical state of Fe in solid materials. Fe Lα,β emission spectra obtained are fitted using Pseudo-Voigt functions and normalized by the inte...

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Autores principales: Yokoyama, Takaomi D, Takahashi, Hideyuki, Koshiya, Shogo, Murano, Takanori, Terauchi, Masami
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9169537/
https://www.ncbi.nlm.nih.gov/pubmed/35294008
http://dx.doi.org/10.1093/jmicro/dfac009
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author Yokoyama, Takaomi D
Takahashi, Hideyuki
Koshiya, Shogo
Murano, Takanori
Terauchi, Masami
author_facet Yokoyama, Takaomi D
Takahashi, Hideyuki
Koshiya, Shogo
Murano, Takanori
Terauchi, Masami
author_sort Yokoyama, Takaomi D
collection PubMed
description The method deriving the L self-absorption spectrum from Lα,β emission spectra obtained at different accelerating voltages has been optimized for analyzing the chemical state of Fe in solid materials. Fe Lα,β emission spectra obtained are fitted using Pseudo-Voigt functions and normalized by the integrated intensity of each Fe Ll line, which is not affected by L(2,3) absorption edge. The self-absorption spectrum is calculated by dividing the normalized intensity profile collected at low accelerating voltage by that collected at a higher accelerating voltage. The obtained profile is referred to as soft X-ray self-absorption structure (SX-SAS). This method is applied to six Fe-based materials (Fe metal, FeO, Fe(3)O(4,) Fe(2)O(3), FeS and FeS(2)) to observe different chemical states of Fe in those materials. By comparing the self-absorption spectra of iron oxides, one can observe the L(3) absorption peak structure shows a shift to the higher energy side as ferric (3+) Fe increases with respect to ferrous (+2) Fe. The intensity profiles of self-absorption spectra of metallic Fe and FeS(2) shows shoulder structures between the L(3) and L(2) absorption peaks, which were not observed in spectra of Fe oxides. These results indicate that the SX-SAS technique is useful to examine X-ray absorption structure as a means to understand the chemical states of transition metal elements.
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spelling pubmed-91695372022-06-06 Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer Yokoyama, Takaomi D Takahashi, Hideyuki Koshiya, Shogo Murano, Takanori Terauchi, Masami Microscopy (Oxf) Article The method deriving the L self-absorption spectrum from Lα,β emission spectra obtained at different accelerating voltages has been optimized for analyzing the chemical state of Fe in solid materials. Fe Lα,β emission spectra obtained are fitted using Pseudo-Voigt functions and normalized by the integrated intensity of each Fe Ll line, which is not affected by L(2,3) absorption edge. The self-absorption spectrum is calculated by dividing the normalized intensity profile collected at low accelerating voltage by that collected at a higher accelerating voltage. The obtained profile is referred to as soft X-ray self-absorption structure (SX-SAS). This method is applied to six Fe-based materials (Fe metal, FeO, Fe(3)O(4,) Fe(2)O(3), FeS and FeS(2)) to observe different chemical states of Fe in those materials. By comparing the self-absorption spectra of iron oxides, one can observe the L(3) absorption peak structure shows a shift to the higher energy side as ferric (3+) Fe increases with respect to ferrous (+2) Fe. The intensity profiles of self-absorption spectra of metallic Fe and FeS(2) shows shoulder structures between the L(3) and L(2) absorption peaks, which were not observed in spectra of Fe oxides. These results indicate that the SX-SAS technique is useful to examine X-ray absorption structure as a means to understand the chemical states of transition metal elements. Oxford University Press 2022-02-17 /pmc/articles/PMC9169537/ /pubmed/35294008 http://dx.doi.org/10.1093/jmicro/dfac009 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of The Japanese Society of Microscopy. https://creativecommons.org/licenses/by-nc/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Article
Yokoyama, Takaomi D
Takahashi, Hideyuki
Koshiya, Shogo
Murano, Takanori
Terauchi, Masami
Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer
title Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer
title_full Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer
title_fullStr Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer
title_full_unstemmed Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer
title_short Analytical technique for self-absorption structure of iron L-emission spectra obtained by soft X-ray emission spectrometer
title_sort analytical technique for self-absorption structure of iron l-emission spectra obtained by soft x-ray emission spectrometer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9169537/
https://www.ncbi.nlm.nih.gov/pubmed/35294008
http://dx.doi.org/10.1093/jmicro/dfac009
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