Low-energy recombination of Ne7+

Low-energy recombination of Ne7+ has been measured at the storage ring CRYRING with a high-energy precision of 15 meV. Using different electron currents the approach for correcting the variation of the ion energy due to the drag force was checked. A multi-configuration Breit-Pauli perturbation calculation using the program AUTOSTRUCTURE for the dielectronic recombination rates has been implemented. The cut-off of Rydberg states by field ionization in the analysing magnet was modified by taking radiative cascade into account. Comparison of this calculation with the measurement shows a good agreement in resonance strength but a small discrepancy in resonant energy. At very low energy, the non-resonant recombination rate is found to be a factor of 2 higher than the estimated radiative recombination rate. No indication of an electron density dependence is found.