Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Highly charged ions and their applications
A 21.1: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Non-perturbative dynamics in heavy-ion-atom collisions — •Pierre-Michel Hillenbrand1,2, Siegbert Hagmann2, Alexandre Gumberidze2, Yury Litvinov2,3, and Thomas Stöhlker2,4,5 — 1Justus-Liebig-Univ., Giessen — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Ruprecht-Karls-Univ., Heidelberg — 4Helmholtzinstitut Jena — 5Friedrich-Schiller-Univ., Jena
Experimental data for atomic collisions of highly-charged ions are essential for benchmarking the theoretical description of fundamental dynamical processes in atomic physics. Of particular challenge is the accurate description of those processes that exceed the applicability of relativistic first-order perturbation theories. Recently, we have investigated two characteristic cases of such collision systems at the GSI heavy-ion accelerator. For collisions of U89+ projectiles with N2 and Xe targets at 76 MeV/u, we studied the electron-loss-to-continuum cusp both experimentally and theoretically. We compared the continuum electron spectra of the two collision systems, which originate from the ionization of the projectile, and were able to identify a clear signature for the non-perturbative character of the collision systems [1]. Furthermore, we performed an x-ray spectroscopy experiment for slow collisions of Xe54+ and Xe53+ with a Xe target at 30 and 15 MeV/u. We analyzed the target Kα satellite and hypersatellite lines to derive cross section ratios for double-to-single target K-shell vacancy production and compared the results to relativistic two-center calculations [2].
[1] Phys. Rev. A 104, 012809 (2021)
[2] Phys. Rev. A, submitted