Photoionization of Al X from ground state using the relativistic R-matrix close-coupling method

The relativistic R-matrix method is used to calculate the total photoionization cross sections from the ground state 1s(2)2s(2) S-1(0) of Al X for photon energies ranges from the first ionization threshold to just above the eighth threshold of the residual ion Al XI. In this work, the relativistic distorted-wave method is employed to calculate the fine-structure energy levels and radial functions. The lowest eight level target states of Al XI are used in the photoionization calculations of Al X and should provide a reasonably complete database for practical application for photoionization cross section for Al X. The resonance energy levels and widths of 18 Rydberg series have been investigated.