Low-order relativistic perturbation-theory calculations are carried out for dielectronic recombination cross sections for ${\mathrm{C}}^{3+}$ above and below the ionization threshold. Cross-sectional calculations are made for the 38 levels of the $1s^{2}2p4l$ resonance configurations that lie within $\pm$1.0 eV of the ionization threshold. The below-threshold calculations predict an unobserved strong resonance feature and provide a guide for future experiments.

• Received 8 February 2011

DOI:https://doi.org/10.1103/PhysRevA.83.042705