Electron Correlation in the Formation of Hollow Li-Like Ions

Abstract

The role of electron correlation in the formation of double-K-shell vacancies in Li-like Be+, B2+, C3+ and O5+ ions has been investigated using high-resolution zero-degree projectile spectroscopy. Using the collision velocity dependence for the cross sections of the observed doubly-K-shell vacant states, the contribution of the e-e interaction was inferred and categorized in terms of shake and dielectronic models. The relative strength of the e-e interaction was examined as a function of the atomic number of the Li-like ion.