光电过程原子能级截面大量计算的实现

在ＨＦＲ方法的基础上，考虑束缚组态间的相互作用，解决了Ｃｏｗａｎ程序光电计算过程中小能量区间误差偏大及一次计算自由电子能量范围受限制的问题，确定了阈能点的计算方式，从而使大量计算成为可能．分析证明了计算结果的正确性并估计了计算精度．并对锂、钠与铯原子计算的结果与参考文献做了比较，从理论上分析了能极水平光电截面求和后的结果与轨道水平光电截面的过渡关系与差别．

LEVEL-LEVEL PHOTOIONIZATION CROSS SECTION DiSCUSSION

Based on the HFR method and considering configuration interaction between bound states,some problems and inadequacies what may be occured in the calculation of photoionization cross sections by using Cowan's theory are discussed,and corrected method is given to solve these problems. Using the method, photoionization cross sections of Li,Na and Cs atoms are calculated and compared with references. The difference and relationship between the orbital-orbital and the summed level-level photoionization cross sections are discussed and analysed theoretically.