Precision studies through resonances in electron-ion recombination

Precision studies through resonances in electron-ion recombination 

The method is based on the nearly complete cancellation between the target excitation energy and the binding energy of the attached electron for certain low-energy resonances. For a lithium-like system, a resonance can be formed in the following way  

Orbital energies (see text) + Coulomb interaction first order 44.27255 44.23494 44.27570 

Extracted energy splitting in Si18+ ls22p3/2-ls22s1/2 44.30945 (15) 44.30932 (15) 44.30952 (15) 

---