Dynamics and Spectral Weights of Shake-up Valence Excitations in   Transition Metal K-edge Resonant Inelastic X-ray Scattering
  Using a model Hamiltonian, we discuss how we could interpret data obtained from transition metal $K$-edge resonant inelastic x-ray scattering (RIXS) experiments. By analyzing the creation of valence excitations from the screening of the core hole and calculating corresponding RIXS spectra for metals and insulators, we find that the probability for excitations depends not only on the total energy but also on the asymmetric screening dynamics between electrons and holes. 
K. H. Ahn, A. J. Fedro, and Michel van Veenendaal