Figure 3.

Photoelectron spectra of C 1s and Fe 2p_3/2 regions recorded using 4.6 keV photons in 1CO:1H₂ at 212 °C (blue dashed line) and in 1CO:10H₂ at 152 and 275 °C (black dash-dotted and red solid lines). The left and middle panels show the C 1s and Fe 2p_3/2 original data treated in the same way as all other data reported in the current contribution. The right panel shows Fe 2p_3/2 data with every spectrum normalized to its maximum value for ease of comparison. “TP” and “O” indicate iron carbide structures with trigonal prismatic and octahedral sites occupied by carbon atoms, respectively.