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. 2020 May 29;10:8772. doi: 10.1038/s41598-020-65225-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Concentration correction method for an inhomogeneous sample. A rectangular region-of-interest (ROI) with a size of 780 × 400 pixels was chosen for all images. (a) The source spectrum and a reference Ag₂O extended x-ray absorption fine structure (EXAFS) spectrum. In addition to the absorption measured at the K-edge (blue energy range), another measurement was carried out at higher energies (orange energy range). (b) The cropped 2d absorption images for measurements with the Laue crystal at rotation angle θ₁ and (c) rotation angle θ₂. (d) The concentration-corrected image was calculated using the the local thickness extracted from the image recorded at θ₂. (e) Compared with the Ag₂O x-ray absorption near edge structure (XANES) spectrum without concentration correction (blue curve), the quality of the corrected data is greatly improved.