Abstract
In this work, a theoretical study of the double ionization of He by ion impact at the fully differential level is presented. Emphasis is made in the role played by the projectile in the double emission process depending on its charge and the amount of momentum transferred to the target. A Born-CDW model including a second-order term in the projectile charge is introduced and evaluated within an on-shell treatment. We find that emission geometries for which the second-order term dominates lead to asymmetric structures around the momentum transfer direction, a typical characteristic of higher order transitions.
Highlights
Three collision mechanisms have been identified as responsible of the atomic double ionization (DI) at intermediate to large impact energies
In figure 1 we show the fully differential cross section calculated by means of the First Born Approximation (FBA) at an impact energy of 500 keV for proton impact
Structures are symmetric with respect to the momentum transfer direction
Summary
1. Introduction Three collision mechanisms have been identified as responsible of the atomic double ionization (DI) at intermediate to large impact energies. The third mechanism, usually referred to as two-step-2 (TS2), considers that electrons are sequentially removed by the projectile. The TS1 and SO mechanisms involve only one interaction of the projectile with a single electron and can be described as first order terms in a perturbative expansion of the scattering amplitude in the projectile charge ZP.
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