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. 2017 Nov 28;7:16526. doi: 10.1038/s41598-017-16733-3

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© The Author(s) 2017

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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Imaging properties of XRS and data extraction. (a) Schematic sketch of the scattering geometry for the high pressure XRS measurements. The inelastically scattered photons from each point of the x-ray beam path through sample and diamond are analyzed and focused onto different positions on the 2D detector. (b) XRS spectra for energy losses at the iron M_2,3-edge obtained from a single pixel analysis along the beam path. Spectra A and B show the signal of the diamond before the sample, curves C and D contain contributions from diamond and sample and spectrum E shows the signal of the diamond behind the sample, which is partly masked by the gasket. (c) Summed signals for selected pixels which contain the background signal only (red, B) and spectra from pixel that contain sample and background signal (blue, summation of pixel C & D). The black solid line indicates the smoothed background signal. (d) Extracted XRS M_2,3-edge after subtraction of the smoothed background.