Fig. 6: Normalized XANES spectra.
A Phosphorus K-edge for 3 (blue trace), 4 (red trace), and 5 (gray trace). B Osmium L3- and L2-edges for 2 (black trace), 3 (blue trace), 4 (red trace), and 5 (gray trace). C Overlay of osmium L2/3–edge XANES spectra for 2–5 within a common energy range (E–E0) where E0 corresponds to the photon energy of the L3 white line maxima while the respective L2 spectra were shifted in energy, such that the post-edge region superimposed with the L3 spectra. Values of the E0 (in eV) for each spectrum are given below their respective edge label. The integrated intensities of the white lines used for the sum rule analysis were obtained by subtracting the step function that reflect transitions into continuum common for both L3 and L2-edges (shaded gray region). The sum rule analysis quantifies the number of electrons populating the 5d5/2 and 5d3/2 sublevels (ne).
