Photoionization cross section of Ne-like Cu XX with J=1

Relativistic calculations of photoionization cross sections of Ne-like Cu XX using the Breit-Pauli R-matrix method in close-coupling approximation and fully relativistic distorted-wave method are reported. In the present work, the relativistic distorted-wave method is employed to calculate the fine-structure energy levels and radial functions, and the Breit-Pauli R-matrix method is employed to calculate photoionizaton cross section for photon energy from 124.2 Ryd to 208 Ryd. Resonance structure in the photoionization of Ne-like Cu XX for ejection of 2p or 2s electron from the ground 2s22p61S0 has been studied.

► Photoionization cross sections of Cu XX are investigated using 11 target states. ► Radiative probabilities, line strength and oscillator strength are studied. ► Many new autoionizing energy levels have been calculated. ► The R-matrix method, distorted-wave method and QB method are used.