Multiconfiguration Dirac-Fock calculations of dielectronic recombination coefficients for the He isoelectronic sequence

Dielectronic recombination coefficients for ground-state ions of the He isoelectronic sequence have been calculated for 13 ions, with atomic number 6≤Z≤42, in the isolated resonance approximation, for temperatures in the range 0.1≤T≤12 keV. The detailed Auger and radiative rates of the doubly excited states were evaluated by using the multiconfiguration Dirac-Fock model. The behavior of the dielectronic recombination coefficient along the isoelectronic sequence is examined. The effect of relativity drastically alters the dielectronic satellite structure of He-like ${\mathrm{Fe}}^{24+}$ and ${\mathrm{Mo}}^{40+}$. However, the relativistic effect reduces the total dielectronic coefficients for ${\mathrm{Fe}}^{24+}$ by only 10% and 2.5% at T=0.5 and 5 keV, and for ${\mathrm{Mo}}^{40+}$ by 18% and 5% at T=2 and 5 keV, respectively.