The Cooper-minimum structure in atomic photoionization cross sections

Based on Dirac-Slater relativistic self-consistent field,the examples of cooper-minimum in photoionization have been found in numerical calculations within a single-electron model at low energies.In these calculations for photoionization of Na and K we find cooper-minimum in the s and p subshells.Our calculated results indicate that the main factors what influence the position of cooper-minimum are atomic core,principal quantum number,angular momentum operator and so on.Finally the theoretical explains of these influence of cooper-minimum in photoionization cross section are given.