PRODUCTION OF HOLLOW LITHIUM BY ELECTRON CORRELATION IN 95 MeV/u Ar18+ +
Li COLLISIONS


J.A. Tanis1,2, J.-Y. Chesnel1,3, F. Fremont3, D. Hennecart3, X. Husson3,
A. Cassimi3, J.P. Grandin3, B. Skogvall4, B. Sulik,5 J.-H. Bremer1, and 
N. Stolterfoht1


1Hahn-Meitner-Institut GmbH, Bereich Festkorperphysik, D-14109 Berlin,
Germany
2Department of Physics, Western Michigan University, Kalamazoo, Michigan
49008
3Centre Interdisciplinaire de Recherche Ions-Lasers, Universite de Caen,
F-14070 Caen Cedex, France
4Technische Universitat Berlin, Hardenberg Str. 36, D-10623 Berlin,
Germany
5Institute of Nuclear Research (ATOMKI), H-4001 Debrecen, Hungary


Double-K-shell-vacancy production in Li by 95 MeV/u Ar18+ projectiles was
investigated using high-resolution electron spectroscopy. Strong line
intensities from the 2s2 1S and 2s3s 3S excited-state configurations are
attributed to the electron-electron interaction.  Formation of the 3S
state, with intensity  ~ 1.5 times that of the 1S, is attributed to a
correlated three-electron transition.