particular at low electron-ion collision energies. DR is a two-step process: X q+ +e− → X (q−1)+ ∗∗ → X (q−1)+ ∗ +photons. In the initial step termed dielectronic capture (DC; time-inverse to autoionization) [...] (CM) collision energies that match the resonance energies a higher count rate of recombined ions, X (q−1)+ , is recorded. DR collision spectroscopy can be regarded as Auger spectroscopy in inverse kinematics