arXiv 2209.136262022-09-27physics.atom-ph

共振阈值阿秒电离光谱中的离子相干性

Ionic Coherence in Resonant Above-Threshold Attosecond Ionization Spectroscopy

Saad Mehmood, Eva Lindroth, Luca Argenti

备注：: 13 pages, 9 figures
DOI：: 10.1103/PhysRevA.107.033103

摘要：

原子的电离与序列的阿秒脉冲产生的激发离子态与发射的光电子纠缠。尽管如此，离子系综保留了一些可以通过激光参数控制的相干性。在氦气中，$2s/2p$ He $^+$相干性的控制由低于$N=2$阈值的自电离状态介导[Phys. Rev. Res. { \bf 3}，023233（2021）]。在目前的工作中，我们研究的作用，低于和高于$N=3$阈值的$N=3$ He $^+$离子的相干性，在阿秒泵探测电离的氦原子，我们模拟使用Newstock \emph{ab initio}代码。由于N=3 He $^+$能级的精细结构分裂，离子偶极子在皮秒时间尺度上跳动。我们展示了如何从偶极跳动，它是可能的重建在其成立之初的离子的极化。

英文摘要：

The ionization of atoms with sequences of attosecond pulses gives rise to excited ionic states that are entangled with the emitted photoelectron. Still, the ionic ensemble preserves some coherence that can be controlled through the laser parameters. In helium, control of the $2s/2p$ He$^+$ coherence is mediated by the autoionizing states below the $N=2$ threshold [Phys. Rev. Res. {\bf 3}, 023233 (2021)]. In the present work we study the role of the resonances both below and above the $N=3$ threshold on the coherence of the $N=3$ He$^+$ ion, in the attosecond pump-probe ionization of the helium atom, which we simulate using the newstock \emph{ab initio} code. Due to the fine-structure splitting of the N=3 He$^+$ level, the ionic dipole beats on a picosecond timescale. We show how, from the dipole beating, it is possible to reconstruct the polarization of the ion at its inception.

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