Resonant x-ray Raman scattering involving avoided crossings in the final-state potential-energy curves - art. no. 062506

The role of avoided crossings for resonant x-ray Raman scattering is explor ed. The strong dependence of the electronic transition amplitudes on intern uclear distance at avoided crossings causes new, and even anomalous, spectr al features, and can bring about a breakdown of the generally accepted part icipator or spectator classification of the transitions. We report, and app ly the theory on, an experimental observation of the electron decay of the N 1s-->pi* core-excited level in N-2 the B(2)Sigma (+)(u) final state with peculiar, non-Franck-Condon, vibrational intensity distributions.