Double Core-Hole Generation in O2 Molecules Using an X-Ray Free-Electron Laser: Molecular-Frame Photoelectron Angular Distributions
Double Core-Hole Generation in O2 Molecules Using an X-Ray Free-Electron Laser: Molecular-Frame Photoelectron Angular Distributions
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DOI：
10.1103/physrevlett.125.163201
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发表时间：
2020-10-14
影响因子：
8.6
通讯作者：
Jahnke, Till
中科院分区：
文献类型：
--
作者：
Kastirke, Gregor;Schoeffler, Markus S.;Jahnke, Till
我们报告在欧洲X射线自由电子激光器在小量子系统仪器使用COLTRIMS反应显微镜进行的多粒子符合实验。通过测量两个离子和两个电子的符合，我们研究了气相中O-2分子的双芯空穴产生。对于氧分子分裂为两个双电荷离子，已经识别出单格位和双格位双核心空穴，并获得了它们的分子框架电子角分布。所测得的分布进行比较的冷冻和松弛的核心Hartree-Fock近似内进行的计算结果。
We report on a multiparticle coincidence experiment performed at the European X-ray Free-Electron Laser at the Small Quantum Systems instrument using a COLTRIMS reaction microscope. By measuring two ions and two electrons in coincidence, we investigate double core-hole generation in O-2 molecules in the gas phase. Single-site and two-site double core holes have been identified and their molecular-frame electron angular distributions have been obtained for a breakup of the oxygen molecule into two doubly charged ions. The measured distributions are compared to results of calculations performed within the frozen- and relaxed-core Hartree-Fock approximations.