Spin-orbit delays in photoemission
Spin-orbit delays in photoemission
复制标题
光电发射中的自旋轨道延迟
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
H. Wörner
中科院分区：
文献类型：
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作者：
I. Jordan;M. Huppert;S. Pabst;A. Kheifets;D. Baykusheva;H. Wörner
从不同电子壳层发射的光电子波包之间的阿秒延迟现在已经被很好地建立。来自同一电子壳层的电子之间是否存在延迟，但使阳离子处于不同的精细结构状态？这个问题与所有涉及重元素的阿秒光电发射研究有关，无论是原子、分子还是固体。我们回答这个基本问题，通过测量与2 P 3 / 2和2 P 1 / 2组件的电子基态的Kr+和Kr +的光电子波包之间的能量依赖的延迟。我们观察到的延迟达到33 ± 6，就像在π的情况下一样。我们的结果进行了比较，与两个国家的最先进的理论。虽然这两种理论在定量上都与Kr的结果一致，但它们都不能完全再现Kr的实验结果。执行延迟测量非常接近的电离阈值，我们比较了几个连续-连续延迟与实验数据的解析公式的协议。我们的研究结果显示了自旋轨道耦合对阿秒光电离延迟的重要影响，强调了进一步理论发展的必要性，并为此类工作提供了一个新的精度基准。
Attosecond delays between photoelectron wave packets emitted from different electronic shells are now well established. Is there any delay between electrons originating from the same electronic shell but leaving the cation in different fine-structure states? This question is relevant for all attosecond photoemission studies involving heavy elements, be it atoms, molecules or solids. We answer this fundamental question by measuring energy-dependent delays between photoelectron wave packets associated with the 2 P 3 / 2 and 2 P 1 / 2 components of the electronic ground states of Xe + and Kr + . We observe delays reaching up to 33 ± 6 as in the case of Xe. Our results are compared with two state-of-the-art theories. Whereas both theories quantitatively agree with the results obtained for Kr, neither of them fully reproduces the experimental results in Xe. Performing delay measurements very close to the ionization thresholds, we compare the agreement of several analytical formulae for the continuum-continuum delays with experimental data. Our results show an important influence of spin-orbit coupling on attosecond photoionization delays, highlight the requirement for additional theory development and offer a new precision benchmark for such work.