连续介质中阿秒时滞的解析模型和Fano倾向定则
Analytical model for attosecond time delays and Fano's propensity rules in the continuum
摘要：
从阿秒时间尺度的双光子实验中提取与原子（或分子）物种相关的单次光电离时间延迟通常依赖于连续-连续跃迁的理论描述。这些过程的现有模型预测了一个普遍的相位贡献，独立的角量子数的最终状态。然而，最近的实验-理论研究[Fuchs，\emph{et al.} Optica 7，154（2020）]确定了对近阈值光电子的角动量的相当大的时间延迟依赖性。在这项研究中，我们提出了一个分析模型的双光子双色跃迁矩阵振幅再现的相位依赖于角量子数的最终状态。最后，我们表明，我们的分析模型也可以描述广义Fano的倾向规则[Busto，\emph{et al.}物理修订快报。123，133201（2019）]用于激光辅助光电离。
英文摘要：
Extracting single photoionization time delays associated with atomic (or molecular) species from attosecond time scale two-photon experiments usually relies on the theoretical description of continuum-continuum transitions. The available models for those processes predict a universal phase contribution, independent of the angular quantum numbers of final states. However, a recent experimental-theoretical study [Fuchs, \emph{et al.} Optica 7, 154 (2020)] determined a sizable time delay dependence on the angular momentum of near-threshold photoelectrons. In this study, we present an analytical model for the two-photon two-color transition matrix amplitudes that reproduces the phase dependence on the angular quantum number of final states. Finally, we show that our analytical model can also describe the generalized Fano's propensity rules [Busto, \emph{et al.} Phys. Rev. Lett. 123, 133201 (2019)] for laser-assisted photoionization.
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