Abstract
The formation of doubly-vacant, i.e., “hollow”, states in 0.5–2.0 MeV/u Li-like C3+ ions colliding with helium has been investigated using high-resolution Auger electron spectroscopy. From the measured spectra, hollow two-electron states corresponding to 2l2l' configurations can be identified, as well as hollow three-electron states corresponding to 2l2l'2l'' configurations. The results suggest that the electron–electron interaction is important in producing the observed double-K-shell-vacancy states.
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