Xu Tong-Tong, Gong Wei-Jiang, Zhang Lian-Lian, Qi Yang
Opt Express. 2020 Nov 9;28(23):35168-35178. doi: 10.1364/OE.409495.
We theoretically investigate the frustrated double ionization (FDI) of Ar atoms with counter-rotating two-color circular (CRTC) laser fields using the three-dimensional (3D) classical ensemble method. Our results show that the FDI probability depends upon the intensity ratio of the CRTC laser fields. The FDI event accompanied with the recollision excitation with subsequent ionization is prevalent and three pathways exist in FDI processes driven by CRTC laser fields. The momentum distribution of a recaptured electron at the ionization time after recollision indicates that the momentum being close to the vector potential is a necessary condition for FDI events to occur. In addition, the recaptured electron most probably transitions to a Rydberg state of which the quantum number is ten in the CRTC fields.
我们使用三维经典系综方法从理论上研究了用反向旋转双色圆偏振（CRTC）激光场对氩原子进行的受阻双电离（FDI）。我们的结果表明，FDI概率取决于CRTC激光场的强度比。伴随着再碰撞激发随后电离的FDI事件很普遍，并且在由CRTC激光场驱动的FDI过程中存在三条途径。再碰撞后电离时刻被俘获电子的动量分布表明，动量接近矢势是FDI事件发生的必要条件。此外，在CRTC场中，被俘获电子最有可能跃迁到量子数为十的里德堡态。
