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. 2019 Apr 5;6(2):024901. doi: 10.1063/1.5090332

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© 2019 Author(s).

2329-7778/2019/6(2)/ 024901/8

All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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FIG. 4. — Fitting a linear combination of the calculated difference spectra to the difference spectra measured for the photon flux of (a) 50.3 × 10³⁰ photon/(s cm²) and for the photon flux of (b) 244 × 10³⁰ photon/(s cm²). Only the experimental data points in the energy range 7048 eV–7068 eV were considered in the fitting procedure. The fit components corresponding to the Fe³⁺-Fe²⁺, Fe⁴⁺-Fe²⁺, and Fe⁵⁺-Fe²⁺ spectral changes are plotted as orange, dark blue, and light blue dashed lines, respectively. A black dashed line marks the total of the fit components' linear combination. (c) Relative populations of Fe oxidation states 3+, 4+, and 5+.