Comparative analysis of oxygen 1s fs-XAS of LaFeO3a) ground state (GS) and excited state (ES) spectra at 0.2, 1, and 5 ps. The energy shift for the t2g and eg peaks are -0.7 and -1 eV, respectively. The ES spectra were derived by Equation S5 (Supporting Information), considering α = 0.1. The inset shows the enlarged region between 526.5 and 529.5 eV. The transient peak, marked by an arrow, is attributed to the ultrafast transition of oxygen 1s electrons to oxygen 2p hole states. Similar spectra with different α values are plotted in Figure S3 (Supporting Information).
