Effects of a static electric field on nonsequential double ionization
Effects of a static electric field on nonsequential double ionization
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DOI：
10.1103/physreva.76.033405
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发表时间：
2007-09
影响因子：
2.9
通讯作者：
Hongyun Li;Bingbing Wang;J. Chen;Hongbing Jiang;Xiaofeng Li;Jie Liu;Q. Gong;Zong-Chao Yan;P. Fu
中科院分区：
文献类型：
--
作者：
Hongyun Li;Bingbing Wang;J. Chen;Hongbing Jiang;Xiaofeng Li;Jie Liu;Q. Gong;Zong-Chao Yan;P. Fu
采用三维半经典方法，系统地研究了外加静电场对线偏振强激光场中氦原子非顺序双电离（NSDI）的影响.研究发现，静电场不仅影响电离率，而且影响电离电子返回母离子的动能，如果电离率增大，则第一个返回电子的动能减小，反之亦然。这两种效应在NSDI中相互竞争。由于静电场对第一电子电离的影响在竞争中起着更为关键的作用，He（2+）动量分布平行于激光场偏振方向的对称双峰结构被破坏。此外，静电场也显著地改变了具有多重碰撞的轨迹对NSDI的贡献。随着静电场的增加，当激光和静电场处于同一方向时开始的具有两个分支的轨迹对于NSDI变得越来越重要。
Using a three-dimensional semiclassical method, we perform a systematic analysis of the effects of an additional static electric field on nonsequential double ionization (NSDI) of a helium atom in an intense, linearly polarized laser field. It is found that the static electric field influences not only the ionization rate, but also the kinetic energy of the ionized electron returning to the parent ion, in such a way that, if the rate is increased, then the kinetic energy of the first returning electron is decreased, and vice versa. These two effects compete in NSDI. Since the effect of the static electric field on the ionization of the first electron plays a more crucial role in the competition, the symmetric double-peak structure of the He(2+) momentum distribution parallel to the polarization of the laser field is destroyed. Furthermore, the contribution of the trajectories with multiple recollisions to the NSDI is also changed dramatically by the static electric field. As the static electric field increases, the trajectories with two recollisions, which start at the time when the laser and the static electric field are in the same direction, become increasingly important for the NSDI.