RESONANT TRANSFER AND EXCITATION IN C-3++LI COLLISIONS

Experimental resonant transfer and excitation (RTE) cross sections wer e measured for lithiumlike carbon ions in the energy range 5-9 MeV inc ident on a lithium vapor target. Transfer excitation populates the 1s2 s2p2 3D state predominantly. Subsequent Auger decay of this state to t he ground state is studied in high resolution using a 0-degrees electr on spectrometer. The measured single-differential cross sections at di fferent projectile energies were compared with theoretical calculation s based on the impulse-approximation formulation of RTE. The results o f these experiments show that while the contribution of the target val ence electron is consistent with impulse-approximation theory, no cont ribution to RTE by the core electrons is seen.