Below Threshold Dielectronic Recombination for B$^{2+}$ and C$^{2+}$

Below threshold dielectronic recombination is investigated for e + B$^{2+}(1s^2 2s)$ -> B$^+(1s^2 2p 3d)$ and for e + C$^{2+}(1s^2 2s^2)$ -> C$^+(1s^2 2s 2p 3d)$. Relativistic atomic structure (GRASP) calculations are used to calculate energies and wavefunctions. Relativistic distorted-wave (AUTOSTRUCTURE) calculations are used to calculate radiative and autoionization rates. The dielectronic recombination rate coefficients were then used to make a synthetic spectrum for use in plasma diagnostics. Photoionized cold plasma temperature and abundance diagnostics are chiefly important for astrophysical applications that currently suffer from vast discrepancies.