The photoionization branching ratios of spin–orbit doublets are studied both experimentally and theoretically at energies several keV above threshold. The results show significant relativistic effects for Ar 2p in the autoionizing region below the 1s threshold, and large many-body effects for Xe 3d and 4d in the vicinity of the L-shell thresholds. The branching ratios in Xe are also found to vary significantly over very broad multi-keV energy regions both above and below the inner-shell thresholds. In addition, the Ar 2p study confirms experimentally the decades-old theoretical prediction that the nonresonant branching ratio does not approach the statistical (nonrelativistic) value, and, in fact, progressively diverges from statistical with increasing photon energy.

在高于阈值几个 keV 的能量下，通过实验和理论研究了自旋轨道双峰的光电离分支比。结果表明 Ar 2 p在低于 1 s阈值的自电离区具有显着的相对论效应，而在 L 壳阈值附近对 Xe 3 d和 4 d 具有较大的多体效应。还发现 Xe 中的支化率在内壳阈值之上和之下都在非常宽的多 keV 能量区域内发生显着变化。此外，Ar 2 p 研究通过实验证实了几十年前的理论预测，即非共振分支比不接近统计（非相对论）值，事实上，随着光子能量的增加，逐渐偏离统计。