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A: Fachverband Atomphysik

A 6: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)

A 6.1: Hauptvortrag

Montag, 6. März 2023, 17:00–17:30, F107

Nonperturbative dynamics in heavy-ion-atom collisions — •Pierre-Michel Hillenbrand¹, Siegbert Hagmann², Alexandre Gumberidze², Yury Litvinov^2,3, and Thomas Stöhlker^2,4,5 — 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 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⁺ projectiles 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 105, 022810 (2022)