Fig. 1: Schematic of the RIXS process for our cases of interest.
From: Resonant inelastic x-ray scattering in warm-dense Fe compounds beyond the SASE FEL resolution limit
This is composed of an energy non-conserving absorption, which excites a K-shell electron (left), followed by an energy non-conserving emission produced by the decay of a L-shell electron into the K-shell core hole (right). The overall process conserves energy. The accessible states are the vacant states in the valence band or, for finite temperature systems, in thermally ionized bound states.
