Dielectronic recombination cross sections for H-like ions

Abstract

Dielectronic recombination cross sections for several H-like atomic ions are calculated in an isolated-resonance, distorted-wave approximation. Fine-structure and configuration-interaction effects are examined in detail for the ${\mathrm{O}}^{7+}$ cross section. Hartree-Fock, intermediate-coupled, multiconfiguration dielectronic recombination cross sections for ${\mathrm{O}}^{7+}$ are then compared with the recent experimental measurements obtained with the Test Storage Ring in Heidelberg. The cross-section spectra line up well in energy and the shape of the main resonance structures are comparable. The experimental integrated cross sections differ by up to 20% from theory, but this may be due in part to uncertainties in the electron distribution function.