Schippers, StefanThoma, MarkusIsberner, LeonardLeonardIsberner2025-02-072025-02-072025https://jlupub.ub.uni-giessen.de/handle/jlupub/20246https://doi.org/10.22029/jlupub-19601For plasma modeling, e.g., in astrophysical environments, reliable data on the recombination of atomic ions with free electrons are required. Especially low-charged heavy ions, which have a high mass-to-charge ratio m/q, and which are found, e.g., in kilonovae, can have a complex electronic structure and therefore the recombination of these ions is difficult to treat theoretically. So far, no experimental data are available on the recombination of low-charged heavy ions. Due to technical limitations, previous electron-ion recombination experiments in storage rings were restricted to ions with a low mass-to-charge ratio m/q ≤ 15. Only in extremely challenging single-pass experiments, recombination of an ion with a higher m/q = 24 was measured. In this work, first experiments on electron-ion recombination of atomic ions were performed at the Cryogenic Storage Ring CSR at the Max-Planck-Institut für Kernphysik in Heidelberg. In two experiments, absolute merged-beams rate coefficients for electron-ion recombination were measured for Ne²⁺ and Xe³⁺ ions. Recombination features from radiative and dielectronic recombination have been observed. The first experiment, performed with Ne²⁺ ions (m/q = 10), demonstrates the general feasibility of electron-ion recombination experiments with atomic ions at CSR. The second experiment, performed with Xe³⁺ ions, which have a high mass-to-charge ratio of m/q = 43, proves the feasibility of recombination experiments with low-charged heavy ions at CSR. The experiments show that recombination of previously not accessible low-charged heavy atomic ions can be studied in the cryogenic environment of CSR.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalddc:530