Mainz 2026 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 4: Highly Charged Ions and their Applications I

A 4.1: Vortrag

Montag, 2. März 2026, 11:45–12:00, N 25

Charge Exchange Mechanisms in Slow Highly Charged Ions Colliding with Gas Targets — •Anju Shaji Nair, Stefan Facsko, and René Heller — Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, Dresden 01328, Germany

The dynamic charge exchange processes occurring during the interaction of slow, highly charged ions (HCI) with a material surface are the key mechanisms guiding the inelastic processes and material response [1,2]. To isolate and understand these fundamental mechanisms, a clean two-body system is required. For this purpose, gas targets are used, as they provide an intrinsically clean environment that enables the examination of individual collision events and provide insights into the underlying electron transfer dynamics.

In this work, the interaction mechanism of slow Xenon ions having charge states 5+ to 30+ with He and N2 targets is investigated. The experimentally determined single-electron capture cross-sections show a decreasing trend with increasing projectile charge state, indicating a shift in the dominant charge exchange pathways from predominantly single-electron capture to contributions from multiple electron transfer processes.

References:

[1] Niggas, A., Werl, M., Aumayr, F., & Wilhelm, R. A. (2024) J. Phys. B: At. Mol. Opt. Phys. 57(7) 072001

[2] Wilhelm, R. A. (2022) Surf. Sci. Rep. 77(4) 100577

Keywords: Highly charged ions; Charge exchange; Single electron capture cross-sections; Gas targets; Ion-atom collisions