Relativistic many-body calculation of low-energy dielectronic resonances in Be-like carbon

We apply the relativistic configuration-interaction method coupled with the many-body perturbation theory (CI+MBPT) to describe low-energy dielectronic recombination. We combine the CI+MBPT approach with the complex rotation method (CRM) and compute the dielectronic recombination spectrum for Li-like carbon, which recombines into Be-like carbon. We demonstrate the utility and evaluate the accuracy of this newly developed CI+MBPT+CRM approach by comparing our results with the results of the previous high-precision study of the Ciii system [Mannervik et al., Phys. Rev. Lett. 81, 313 (1998)].

Figure 1

Illustration of the CI+MBPT+CRM method for locating the $2p4d^1{S}_0$ resonance. The upper (central) panel shows dependence of the real (imaginary) part of the energy on the CRM rotation angle $\theta$. The bottom panel shows the corresponding trajectory in the complex plane. The kink in the trajectory marks the position of the resonance.