利用相对论平均自洽场理论,研究了相对论波函数的小分量对原子光电离截面的影响.原子核尺寸效应将使波函数小分量对原子光电离截面的影响减弱.由于波函数沿径向空间被压缩,电子离核的平均半径较小,波函数小分量对高离化态离子光电离截面的影响比对一般原子要强得多.波函数小分量反映了相对论效应的基本特征,从而也定性地说明了光电离过程中相对论效应的强弱.
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