Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 46: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)
Q 46.5: Vortrag
Mittwoch, 12. März 2025, 15:30–15:45, KlHS Mathe
Absolute rate coefficients from dielectronic recombination for the astrophysically relevant ion of Ne3+ at CRYRING@ESR — •E.-O. Hanu1,3,10, M. Lestinsky1, E. B. Menz1,3,4, M. Fogle2, S. Schippers5,6, P.-M. Hillenbrand1,5, M. Looshorn5,6, S. Wang5,6, R. Schuch7, C. Brandau1, K. Ueberholz8, R. S. Sidhu9, M. Tatsch5,6, A. Biniskos10, and T. Stoehlker1,3,4 — 1GSI, Darmstadt, Germany — 2Dep. of Physics, Auburn University, USA — 3HI Jena, Germany — 4Uni Jena, Germany — 5I. Physikalisches Institut, Uni Giessen, Germany — 6HFHF, Giessen, Germany — 7Dep. of Physics, Stockholm University, Sweden — 8IKP, Uni Muenster, Germany — 9School of Physics and Astronomy, University of Edinburgh, UK — 10Uni Frankfurt am Main, Germany
Dielectronic recombination (DR) is a resonant electron capture process, critical in astrophysical plasmas. At CRYRING@ESR, pure ion beams are stored, cooled, and exposed to a monoenergetic electron beam, enabling high-precision DR measurements at low electron-ion interaction energies. These measurements are vital for understanding cold plasma environments. Neon, among the most abundant cosmic elements, appears in spectroscopic data of various astrophysical objects. We present preliminary results from DR experiments with N-like Ne3+ ions. Ions were injected from an ECRIS, accelerated to 2.23 MeV/u, stored, and electron-cooled in CRYRING with ~6 * 10^6 ions per cycle and ~10 s beam lifetimes. DR spectra were recorded over 0 - 24 eV, revealing strong resonances, especially below 0.5 eV, where rates approach those near the series limit (~24 eV).
Keywords: dielectronic recombination; electron-ion interaction; storage ring; low charged ions; astrophysical plasma