利用Dirac-Slater相对论自洽场理论,研究了入射光子能量较小时Na和K原子最外壳层电子的光电离截面的变化规律及其s和p壳层的Cooper最小,在论述Cooper最小的产生原因及其基本特征的基础上,分析了影响Cooper最小的主要因素原子实、主量子数、角量子数以及总量子数等,并对这种影响进行了较为详细的理论说明.
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.