Ben Shuai, Guo Pei-Ying, Song Kai-Li, Xu Tong-Tong, Yu Wei-Wei, Liu Xue-Shen
Opt Express. 2017 Jan 23;25(2):1288-1295. doi: 10.1364/OE.25.001288.
With the classical ensemble method, the correlated-electron dynamics of Mg atom from a doubly excited, transition Coulomb complex in few-cycle circularly polarized (CP) laser field at low laser intensity is theoretically investigated. The low energy transfer during the recollision process indicates that the two electrons cannot release directly, but it can pass through a doubly excited state, and then escape with the ionization time difference. The numerical results show that the feature of the sequential double ionization (SDI) can be observed in the nonsequential double ionization (NSDI) process. The SDI-like results demonstrate that the intermediate state has lost any memory of its formation dynamics. The distribution of the angle between the two release directions of the two electrons also depends on the ionization time difference. Finally, the influence of e-e Coulomb repulsion is discussed.
采用经典系综方法，对低激光强度下少周期圆偏振（CP）激光场中双激发跃迁库仑复合物中Mg原子的关联电子动力学进行了理论研究。重碰撞过程中的低能量转移表明，两个电子不能直接释放，而是可以通过双激发态，然后以电离时间差逃逸。数值结果表明，在非序列双电离（NSDI）过程中可以观察到序列双电离（SDI）的特征。类似SDI的结果表明，中间态已经失去了其形成动力学的任何记忆。两个电子的两个释放方向之间的夹角分布也取决于电离时间差。最后，讨论了电子-电子库仑排斥的影响。
