Fig. 1: Resonant double-core excitation process and its characteristic decay channels.
From: Observation of molecular resonant double-core excitation driven by intense X-ray pulses

A schematic illustration of the resonant double-core excitation process and of the monitored double (DCH-PP) and single participator (DCH-SP) decay channels in N2. For simplicity, the diagram for the double excitation step on the left only represents the dipole allowed partial determinant of the final state \({\Psi }_{DCH}({\scriptstyle{1}\atop}{\Sigma }_{g}^{+})=(\phi (1{\sigma }_{g}^{-2})-\phi (1{\sigma }_{u}^{-2}))/\sqrt{2}\) (see “Introduction”).