Role of two-electron excitation-ionization processes in the ionization of lithium atoms by fast ion impact.

Kirchner, T. and Khazai, N. and Gulyás, László (2014) Role of two-electron excitation-ionization processes in the ionization of lithium atoms by fast ion impact. PHYSICAL REVIEW A, 89 (6). pp. 1-21. ISSN 2469-9926

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Abstract

We study excitation and ionization in the 1.5 MeV/amu O8+-Li collision system, which was the subject of a recent reaction-microscope-type experiment [Fischer et al., Phys. Rev. Lett. 109, 113202 (2012)]. Starting from an independent-electron model based on determinantal wave functions and using single-electron basis generator method and continuum distorted-wave with eikonal initial-state calculations we show that pure single ionization of a lithium K-shell electron is too weak a process to explain the measured single differential cross section. Rather, our analysis suggests that two-electron excitation-ionization processes occur and have to be taken into account when comparing with the data. Good agreement is obtained only if we replace the independentelectron calculation by an independent-event model for one of the excitation-ionization processes and also take a shake-off process into account.

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