Photoionization and Electron-Ion Recombination: Fe~XVII, S~XIV AND S~XV Using Unified Method

New results on photoionization and electron-ion recombination from unified method for Fe~XVII, S~XIV, and S~XV will be reported. The unified method, based on close-coupling approximation and R-matrix method, (i) subsumes both the radiative and dielectronic recombinations and (ii) provides self-consistent sets of photoionization and recombination cross sections, $\sigma_{PI}$ and $\sigma_{RC}$. Important features will be illustrated for level-specific total and partial photoionization cross sections, total and level-specific recombination rate coefficients, such as of diagnostic w, x, y, z X-ray lines of S~XV and ultraviolet lines of S~XIV observed in astrophysical spectra. Results are obtained for the first time for fine structure levels with $n \leq 10$ and $0 \leq l \leq 9$ which are 98 levels of S~XIV of total angular momenta 1/2 $\leq J \leq$ 17/2 and 188 levels of S~XV of $0 \leq J \leq 10$. Total recombination rates agree well with the available rates. $\sigma_{PI}$ of Fe~XVII for hundreds of fine structure levels being calculated using relativistic Breit-Pauli R-matrix method will also be reported. The wavefunction includes ground and 59 core excitations of n=2 and 3 complexes. Impact of n=3 core excitations will be illustrated.