超短强Laser脉冲辐照下双原子分子双电离动力学的经典轨线透视
Classical Trajectory Perspective on Double Ionization Dynamics of Diatomic Molecules Irradiated by Ultrashort Intense Laser Pulses
摘要：
本文提出了一个强激光脉冲作用下分子双电离的准静态半经典模型。利用该模型，我们深入研究了在双中心库仑势和强激光场的共同作用下，两个高度关联的价电子的动力学行为，揭示了分子排列对双离子产额与单离子产额之比的重要影响.对经典轨道的分析揭示了分子双电离的亚周期动力学。通过对经典轨道的反分析，揭示并解释了许多有趣的特征，如发射电子在平行动量平面的第一和第三象限的积累，关联动量随最近碰撞和电离时刻之间的时间延迟的规律.定量协议与实验数据在很宽的范围内的激光强度从隧穿到过势垒制度。
英文摘要：
In the present paper, we develop a semiclassical quasi-static model accounting for molecular double ionization in an intense laser pulse. With this model, we achieve insight into the dynamics of two highly-correlated valence electrons under the combined influence of a two-center Coulomb potential and an intense laser field, and reveal the significant influence of molecular alignment on the ratio of double over single ion yield. Analysis on the classical trajectories unveils sub-cycle dynamics of the molecular double ionization. Many interesting features, such as the accumulation of emitted electrons in the first and third quadrants of parallel momentum plane, the regular pattern of correlated momentum with respect to the time delay between closest collision and ionization moment, are revealed and successfully explained by back analyzing the classical trajectories. Quantitative agreement with experimental data over a wide range of laser intensities from tunneling to over-the-barrier regime is presented.
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