The single, double, triple, and quadruple Auger decays of ${\mathrm{Ar}}^{+}\left(2s^{-1}\right)$ are studied, based on many-body perturbation theory. The level-to-level investigation indicates that the double Auger primarily comes from the cascade process involving the Coster-Kronig decay. Moreover, the complex triple Auger and quadruple Auger decay are expressed by the multistep approach, i.e., the combination of cascade and direct processes. On the other hand, by employing the separate orbital sets for optimizing the single-electron wave functions, our ion yield ratios (${\mathrm{Ar}}^{2+}:{\mathrm{Ar}}^{3+}:{\mathrm{Ar}}^{4+}:{\mathrm{Ar}}^{5+}=3.5:88.7:7.5:0.26$) agree quite well with the recent experimental data (3:89:8:0.3) [Lablanquie et al., Phys. Chem. Chem. Phys. 13, 18355 (2011)]. Moreover, the single, double, and triple Auger spectra, as well as lifetime, are all in accord with the measurements of Lablanquie et al.

中文翻译：

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轨道集对Ar+(2s−1)多重俄歇衰变的影响

单倍、双倍、三倍和四倍的俄歇衰变 ${\mathrm{氩气}}^{+}\left(2{秒}^{-1}\right)$基于多体微扰理论进行研究。逐级调查表明，双螺旋主要来自涉及 Coster-Kronig 衰变的级联过程。此外，复杂的三重俄歇和四重俄歇衰减由多步方法表示，即级联和直接过程的组合。另一方面，通过使用单独的轨道集来优化单电子波函数，我们的离子产率（${\mathrm{氩气}}^{2+}：{\mathrm{氩气}}^{3+}：{\mathrm{氩气}}^{4+}：{\mathrm{氩气}}^{5+}=3.5：88.7：7.5：0.26$) 非常同意最近的实验数据 (3:89:8:0.3) [Lablanquie等人。，物理。化学 化学 物理。 13 , 18355 (2011)]。此外，单、双和三重俄歇光谱以及寿命都与 Lablanquie等人的测量结果一致。