Fig. 4

Voigt function fitting of experimental NIXS spectra. a The experimental spectra (black) were fit with Voigt functions that are a convolution between a 1.4 eV FWHM Gaussian function (to model the experimental resolution) and a 1.8 eV FWHM Lorentzian function (to model lifetime broadening). The component curves were integrated for each spectrum of Fig. 3, and this value is plotted on the polar plot of Fig. 5, as a function of sample angle. b A schematic energy level diagram for the Co\({}_{\text{oct}}\) site in a 3+ low-spin state shows that all the holes are in the \({e}_{g}\) orbitals, while the energy level diagram for the Co\({}_{\text{trig}}\) site shows the energy levels determined in this experiment. We observe that the Co is in a 3+ high-spin configuration, and that the sixth and minority-spin electron occupies the \({d}_{2}\) orbital in the ground state.