Bonn 2025 – scientific programme
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A: Fachverband Atomphysik
A 39: Highly Charged Ions and their Applications
A 39.2: Talk
Friday, March 14, 2025, 11:15–11:30, KlHS Mathe
High-precision laboratory astrophysics with TES-micro-calorimeter and EBIT — •Marc Botz1, Luciano Gottardi2, Martin de Wit2, Liyi Gu2, Jonas Danisch1, Chintan Shah1, Alexeï Molin3, Francois Pajot3, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2SRON, Leiden, Netherlands — 3IRAP, Toulouse, France
We have combined a state-of-the-art array of transition edge sensor (TES) x-ray microcalorimeters with an electron beam ion trap (EBIT) for providing laboratory spectroscopy benchmarks needed to analyze observational data from the recently launched X-ray satellite XRISM. In the EBIT we produce, trap and excite by electron impact the same highly charged ions that mission observes, and collect high dynamic range spectra with the TES-array having a resolution between 1.5eV and 4eV over a wide spectral bandwidth from 300eV to 13keV.
We present measurements on highly charged iron and sulfur ions, demonstrating the systems exceptional performance. Our data on the dielectronic recombination of different charge states of iron allow for the determination of K-alpha emission energies with outstanding precision. Measurements of the radiative recombination and Rydberg transitions of helium- and hydrogen-like sulfur up to the series limit allow us to infer their transition rates.
The research leading to these results has received funding from the European Union's Horizon 2020 Programme under the AHEAD2020 project (grant agreement n. 871158)
Keywords: Highly charged ions; Astrophysics; Spectroscopy; Microcalorimeter; Dielectronic recombination