Laboratory Measurements of Ca XIX Dielectronic Recombination Satellites
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| Format: | Preprint |
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2025
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| author | Grilo, Filipe Botz, Marc Shah, Chintan Pfeifer, Thomas López-Urrutia, José R. Crespo Amaro, Pedro |
| author_facet | Grilo, Filipe Botz, Marc Shah, Chintan Pfeifer, Thomas López-Urrutia, José R. Crespo Amaro, Pedro |
| contents | We report measurements of the K$α$ emission from the astrophysically very abundant Ca XIX (He-like ion) and its satellite lines resonantly excited by dielectronic recombination (DR). We achieve an electron-energy resolution of 8 eV in a cryogenic electron beam ion trap, and determine the energies of the exciting electrons and the emitted photons up to the KLn ($n\le 8$) manifold with $0.05\%$ and $0.1\%$ respective uncertainties. For the KLL satellites, energies agree very well with our predictions using the Flexible Atomic Code (FAC) and previous state-of-the-art calculations. Our calculations also agree with our experimental direct excitation cross-sections for K$α$ within their $10\%$ uncertainty. We extract DR coefficient rates and find good agreement with values tabulated in the OPEN-ADAS database. As an application, we experimentally benchmark Ca XIX atomic data used to model high-temperature astrophysical plasmas by comparing FAC synthetic spectra with recent XRISM observations revealing the contributions of DR satellites to the Ca XIX lines. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_09975 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Laboratory Measurements of Ca XIX Dielectronic Recombination Satellites Grilo, Filipe Botz, Marc Shah, Chintan Pfeifer, Thomas López-Urrutia, José R. Crespo Amaro, Pedro Atomic Physics Instrumentation and Methods for Astrophysics Plasma Physics We report measurements of the K$α$ emission from the astrophysically very abundant Ca XIX (He-like ion) and its satellite lines resonantly excited by dielectronic recombination (DR). We achieve an electron-energy resolution of 8 eV in a cryogenic electron beam ion trap, and determine the energies of the exciting electrons and the emitted photons up to the KLn ($n\le 8$) manifold with $0.05\%$ and $0.1\%$ respective uncertainties. For the KLL satellites, energies agree very well with our predictions using the Flexible Atomic Code (FAC) and previous state-of-the-art calculations. Our calculations also agree with our experimental direct excitation cross-sections for K$α$ within their $10\%$ uncertainty. We extract DR coefficient rates and find good agreement with values tabulated in the OPEN-ADAS database. As an application, we experimentally benchmark Ca XIX atomic data used to model high-temperature astrophysical plasmas by comparing FAC synthetic spectra with recent XRISM observations revealing the contributions of DR satellites to the Ca XIX lines. |
| title | Laboratory Measurements of Ca XIX Dielectronic Recombination Satellites |
| topic | Atomic Physics Instrumentation and Methods for Astrophysics Plasma Physics |
| url | https://arxiv.org/abs/2508.09975 |