Radiative recombination and photoionization cross sections for impurities in plasmas: III. Ions of elements with Z⩽20

Presented here are total cross sections of radiative recombination for 55 ions of elements from C to Ca as well as partial photoionization cross sections in the electron kinetic energy range of 1 eV to 50  keV. The data are given for bare nuclei, H-, He-, Be-, Ne-, and Ar-like recombining ions. The calculations were performed in the framework of the relativistic Dirac-Fock method. Partial photoionization cross sections for states with n⩽10 and orbital momenta ℓ⩽4 were approximated by an analytical expression with five fit parameters. The results supplement our database of radiative recombination and photoionization cross sections for impurity ions occurring in fusion and astrophysical plasmas. The data are required for modelling and diagnostics of plasmas.