Ja. Tanis et al., Production of hollow lithium by multielectron correlation in 95 MeV/nucleon Ar18++Li collisions, PHYS REV L, 83(6), 1999, pp. 1131-1134
Double-K-shell-vacancy production in Li by 95 MeV/nucleon Ar18+ projectiles
was investigated using high-resolution electron spectroscopy. The two K va
cancies are found to come about mainly by ionization and excitation, giving
rise to excited states in hollow Li+. Strong line intensities from the 2s(
2 1)S and 2s3s S-3 configurations provide spectral identification for the e
lectron-electron interaction. Production of the 2s3s S-3 state, with an int
ensity greater than that for 2s(2) S-1, is attributed to a three-electron t
ransition involving correlation.