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MO: Fachverband Molekülphysik

MO 7: Collisions, Scattering and Correlation Phenomena II (joint session A/MO)

MO 7.5: Vortrag

Montag, 2. März 2026, 18:00–18:15, N 2

Rate coefficients for dielectronic recombination of the astrophysically relevant N-like Ne ion at CRYRING@ESR — •Elena-Oana Hanu^1,2,3, Michael Lestinsky¹, Carsten Brandau¹, Michael Fogle⁵, Pierre-Michel Hillenbrand¹, Mirko Looshorn^6,7, Esther Menz^1,4, Stefan Schippers^6,7, Reinhold Schuch⁸, Maria Tatsch^6,7, Ken Ueberholtz⁹, Shu-Xing Wang^6,7, and Thomas Stoehlker¹ — ¹GSI GmbH, Darmstadt — ²HI Jena — ³GU Frankfurt am Main — ⁴Universität zu Köln — ⁵Dep. of Physics, Auburn University, USA — ⁶I. Physikalisches Institut, Uni Giessen — ⁷HFHF, Giessen — ⁸Dep. of Physics, Stockholm University, Sweden — ⁹IKP, Uni Muenster

Dielectronic recombination of N-like Ne was studied using a merged-beams setup at CRYRING@ESR for collision energies from 0 to 25 eV. The measured energy-dependent recombination rate coefficient includes all ΔN=0 DR resonances from 2s to 2p core excitations was compared with results from theoretical calculations. The ion beam contained roughly equal fractions of ions in the ground-state and in metastable states, therefore the theoretical rates were weighted accordingly. From the measurements we derived a DR plasma rate coefficient α(T). The results agree well with previous theory for high temperatures where N-like Ne is abundant, but yield slightly higher rates at the lower temperatures typical of photoionized plasmas and collisionally ionized plasmas. Parametrized fits of the experimental DR plasma rates are provided for use in astrophysical models.

Keywords: dielectronic recombination; low charged ions; storage rings; astrophysical plasma