Abstract
Target electron removal in Li2+-Li collisions at 2290 keV/amu is studied experimentally and theoretically for ground and excited lithium target configurations. It is shown that in outer-shell ionization a single-electron process plays the dominant part. However, the K-shell ionization results are more difficult to interpret. According to our calculations, the process is shown to be strongly single-particle like. On one hand, a high resemblance between theoretical single-particle ionization and exclusive inner-shell ionization is demonstrated, and contributions from multi-electron processes are found to be weak. On the other hand, it is indicated by the discrepancy between experimental and single-particle theoretical results that multi-electron processes involving ionization from the outer-shell may play a crucial role.
Highlights
Electron removal from few-electron atoms by fast ions has been of interest to collision physics for many decades [1]
The magneto-optical trap reactionmicroscope (MOTReMi) approach is suitable for alkalis, and lithium has become experimentally accessible as a target atom [2], raising substantial experimental and theoretical interest [3, 4, 5, 6, 7]
We reduce the Hamiltonian to a set of one-body operators neglecting the full account of electron-electron interactions, i.e., the independent electron (IEL) model is employed
Summary
Electron removal from few-electron atoms by fast ions has been of interest to collision physics for many decades [1]. The great interest for these collision systems is mostly fueled by a desire for a better understanding of single- and multi-electron processes. With the experimental development of the magneto-optical trap reactionmicroscope (MOTReMi) setup [2] did it become possible to investigate a whole new range of collision systems allowing to study single- and multi-electron processes with great accuracy. The MOTReMi approach is suitable for alkalis, and lithium has become experimentally accessible as a target atom [2], raising substantial experimental and theoretical interest [3, 4, 5, 6, 7]. In this paper we investigate target ionization in Li2+-Li collisions at 2290 keV/amu for Li(1s22s) (ground) and Li(1s22p) (excited) target configurations.
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