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Spectroscopic observations with instruments onboard satellite observatories give access to details of the state and dynamics of matter in astrophysical objects. For extremely hot environments, like galaxy clusters or the surroundings of supermassive black holes in active galactic nuclei, many spectral features originate from highly ionized matter and can be observed in the UV and x-ray spectral ranges. In many such cases however, what information can be gained is currently limited by the availability and quality of atomic data, which are the basis for plasma models. Laboratory measurements are necessary to obtain the required data, like transition energies, and rates of excitation and ionization processes.
Electron beam ion traps (EBITs), like the compact PolarX-EBIT, can be used to provide targets of highly charged ions for monochromatized synchrotron radiation. Scanning the photon energy and simultaneously recording resonantly excited fluorescence as well as changes in ion charge state allows to gather spectroscopic data, beyond what has been possible in earlier experiments. Recent technical improvements in experiments at PETRA III led to unprecedented resolving powers and signal-to-noise ratios, which yielded new insights into a variety of astrophysical questions.
https://desy.zoom.us/j/62301334078
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