Annual Meeting of the ErUM-FSP APPA 2026

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 in-
cludes 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 accord-
ingly. From the measurements we derived a DR plasma rate coefficient
𝛼(T). The results agree well with previous theory for high tempera-
tures where N-like Ne is abundant, but yield slightly higher rates at
the lower temperatures typical of photoionized plasmas and collision-
ally ionized plasmas. Parametrized fits of the experimental DR plasma
rates are provided for use in astrophysical models.