Resonant photoemission at the 2p edge in compounds containing Mn with different valences

We have investigated the Raman-Auger crossover of the Mn 2p non-radiative decays in bulk MnO. For the highest kinetic energy transition in the Mn 2p3p3p decay, Raman behaviour is observed up to ≈3.4 eV above the resonance energy (maximum of the L3 absorption). In the case of the 2p3p3d and 2p3d3d transitions a similar situation occurs up to ≈5 eV above the resonance energy. We compare these results to those obtained on a thin MnO layer deposited on Cu, on bulk Mn and on La0.7Sr0.3MnO3. The results are discussed in terms of the screening dynamics of the Mn 2p core hole and of the metallic/insulating character of the material.