SAMOP 2023 – wissenschaftliches Programm

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SYHC: Symposium Precision Physics with Highly Charged Ions

SYHC 1: Highly Charged Ions for Atomic, Nuclear and Astrophysics

SYHC 1.4: Hauptvortrag

Montag, 6. März 2023, 12:30–13:00, E415

Laboratory X-ray Astropohysics with Trapped Highly Charged Ions at Synchrotron Light Sources — •Sonja Bernitt — Helmholtz-Institut Jena, Germany — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

The newest generation of high-resolution UV and X-ray spectroscopic instruments onboard current and future satellite observatories has the potential to uncover previously inaccessible details of processes in astrophysical plasmas, such as the ones found in galaxy clusters and in the proximity of active galactic nuclei. This is essential for advancing our understanding of extreme environments and the evolution of the universe.

However, what can be reconstructed from spectra is currently limited by the availability and quality of atomic data, which are the basis for plasma models. That is especially the case for highly charged ions (HCI), ubiquitous in hot astrophysical environments. Laboratory measurements are necessary to provide atomic data, like transition energies, as well as rates of excitation and ionization processes.

Here, work with electron beam ion traps (EBITs) is presented, in which radiation from ultrabrilliant UV and X-ray synchrotron light sources is used to resonantly excite electronic transitions in trapped HCI. Subsequent fluorescence and changes in ion charge state are detected, allowing to gather spectroscopic data, reaching unprecedented resolving powers and signal-to-noise ratios. This has led to a variety of new insights into questions related to astrophysics.