Conjugate photoelectron recapture peaks in the high resolution Auger electron spectra following near-threshold Ar 2p photoionization
Conjugate photoelectron recapture peaks in the high resolution Auger electron spectra following near-threshold Ar 2p photoionization
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近阈值 Ar 2p 光电离后高分辨率俄歇电子能谱中的共轭光电子重捕获峰
DOI：
10.1088/1361-6455/ab7fc1
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
F Koike and Y Azuma
中科院分区：
文献类型：
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作者：
S Kosugi;J Martins;F Hosseini;T Marchenko;O Travnikova;J D Bozek;K Ito;E Sokell;M N Piancastelli;M Simon;F Koike and Y Azuma
我们观察到在Ar(L 3M2，3M2，3)俄歇电子能谱上形成叠加的里德堡系列，光激发略高于2p−1 3/2的光致电离阈值。这是由于俄歇电子与光电子的后碰撞相互作用引起的光电子的重新俘获：Ar+2p−1 3/2+e−→Ar+3p−2ml+e−。角动量态分辨Rydberg峰的强度分布显示，由于光电子与俄歇电子之间的角动量交换，Rydberg峰具有明显的共轭峰。此外，我们还测量了2p−1 3/2 nl→3p−2 ML+e−共振俄歇谱，其分辨率低于2p−1 3/2阈值。结果表明，在旁观俄歇过程中，共轭振动2p−1 3/2和→3p−2 MP+e−过程比直接的2p−1 3/2和→3p−2ms，(m−1)d+e−过程要强，这意味着光电子和俄歇电子之间有很强的角动量交换效应.
We have observed formation of Rydberg series superimposed on the Ar (L 3 M 2, 3 M 2, 3) Auger electron spectral profile with photoexcitation just above the 2p− 1 3/2 photoionization threshold. This is due to the recapture of photoelectrons induced by post-collision interaction between the Auger electron and photoelectron: Ar+ 2p− 1 3/2+ e−→ Ar+ 3p− 2 ml+ e−. The intensity distribution of the angular momentum state resolved Rydberg peaks revealed prominent conjugate peaks due to angular momentum exchange between photoelectrons and Auger electrons in the process. In addition, we measured the 2p− 1 3/2 nl→ 3p− 2 ml+ e− resonant Auger spectra with high resolution below the 2p− 1 3/2 threshold. Our results showed that conjugate shake-up/down 2p− 1 3/2 nd→ 3p− 2 mp+ e− processes are stronger than the direct 2p− 1 3/2 nd→ 3p− 2 ms,(m− 1) d+ e− processes in the spectator Auger processes, implying a strong angular momentum exchange effect between photoelectron and Auger electron.