High-resolution measurement of dielectronic recombination of lithiumlikeCu26+

Energies and absolute cross sections for dielectronic recombination of lithiumlike ${\mathrm{Cu}}^{26+}$ via ΔN=0 and ΔN=1 resonances have been measured at the Heidelberg heavy-ion storage ring TSR employing the electron cooler as a target of free electrons. In particular, resonances associated with 2s→2p and 2s→3l excitations have been observed. Resonances due to the doubly excited states 1${\mathit{s}}^2$2${\mathit{p}}_{1/2}$nl and 1${\mathit{s}}^2$2${\mathit{p}}_{3/2}$nl could be resolved up to n=30. Fine-structure components are partly resolved for the 1${\mathit{s}}^2$3l3l’ resonances. The results are compared with theoretical calculations and show good agreement.