中文摘要：

考虑到离子的相对论效应，依据屏蔽方法，给出了原子第2、1壳层电子电离能的一种表达式．依据较轻元素原子低次（小于13）电离能实验数据，总结出原子（离子）电离第2、1壳层不同电子态电子时，相应的屏蔽系数与电子态及原子序数的函数关系，根据该函数关系，可求出相应原子的高次电离电子的屏蔽系数．计算了原子序数13至23的元素高电荷态离子基态电离能，计算结果与文献可提供的实验数据相符合．

英文摘要：

Taking into account the ions relativistic effect, the expression of atomic ionization energy of electronic state of the second and first shell is given using shielding method. Based on the experimental data of low （less than 13） ionization energy of lighter elements, the function of shielding coefficient, e- lectronic states and atomic number is summarized when the atom （ion） ionizes electron in different electronic state of the second and first shell. According to the function, the shielding coefficient of electron of high ionized atom can be obtained. The ionization energy of ground state of highly charged ions whose atomic number is between 13and 23 is calculated, and the results is consistent with experimental data of the literature.