Recollision of excited electron in below-threshold nonsequential double ionization
Recollision of excited electron in below-threshold nonsequential double ionization
复制标题
低于阈值非顺序双电离中激发电子的再碰撞
DOI：
10.1038/s42005-022-00809-2
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发表时间：
2022
影响因子：
5.5
通讯作者：
Jing Chen
中科院分区：
文献类型：
--
作者：
Xiaolei Hao;Yuxing Bai;Chan Li;Jingyu Zhang;Weidong Li;Weifeng Yang;Mingqing Liu;Jing Chen
重碰撞是强场物理中最重要的后隧穿过程，但迄今为止，重碰撞仅限于非顺序双电离中第一个电离电子与剩余离子之间的相互作用。在这里，我们确定的第二个电离电子在低于阈值的非顺序双电离过程中的作用，通过引入库仑校正的量子轨道方法。我们将再现实验观察到的十字形和反相关模式的相关两个电子的动量分布，以及它们之间的过渡。结果表明，在强激光场中，第二电子的反关联和十字形运动都是由第二电子的反关联运动轨迹引起的，而第二电子的反关联运动由于高价态剩余离子的库仑势增强而显著增强，并由于第二电子的再捕获过程而进一步增强，这为强激光场中原子和分子的超快动力学成像提供了一条可能的途径.
Recollision is the most important post-tunneling process in strong-field physics, but so far has been restricted to interaction between the first ionized electron and the residual ion in nonsequential double ionization. Here we identify the role of recollision of the second ionized electron in the below-threshold nonsequential double ionization process by introducing a Coulomb-corrected quantum-trajectories method. We will reproduce the experimentally observed cross-shaped and anti-correlated patterns in correlated two-electron momentum distributions, and the transition between them. Both the cross-shaped and anti-correlated patterns are attributed to recolliding trajectories of the second electron. The effect of recollision of the second electron is significantly enhanced by the stronger Coulomb potential of the higher valence residual ion, and is further strengthened by the recapture process of the second electron. Our work paves a potential way to image ultrafast dynamics of atoms and molecules in intense laser field.