Anticorrelation in nonsequential double ionization of helium
Anticorrelation in nonsequential double ionization of helium
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氦非连续双电离的反相关
DOI：
10.1103/physreva.103.053102
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发表时间：
2021-05
影响因子：
2.9
通讯作者：
Bartschat Klaus
中科院分区：
文献类型：
--
作者：
Chen Zhangjin;Zhou Anran;Morishita Toru;Bai Yuxing;Hao Xiaolei;Zatsarinny Oleg;Bartschat Klaus
本文用定量再散射模型计算了峰值强度为的400 nm激光脉冲中氦原子非顺序双电离的相关双电子动量分布，该模型考虑了电离瞬间电场的存在对电离阈值的降低。虽然不同的相关的背靠背发射的电子沿着的极化方向预测雅阁与其他现有的理论模拟，我们提出了一种替代机制，是负责的关系。在强度低于超晶格阈值时，超晶格激发只能在库仑势的势垒被电场充分抑制时发生。受激电子在穿过电场后的“延迟”电离时间开始电离，因此在随后的电场峰值后被隧道电离的概率增加。结果表明，“延迟”的碰撞时间决定了隧穿电子的平行动量分布，对形成碰撞关系起着决定性作用。
We calculate the correlated two-electron momentum distributions for nonsequential double ionization of helium in a 400-nm laser pulse with a peak intensity of, which is below the recollision threshold, by using the quantitative rescattering model in which the lowering of the threshold due to the presence of the electric field at the instant of recollision is taken into account. While distinct correlated back-to-back emission of the electrons along the polarization direction is predicted in accord with other existing theoretical simulations, we suggest an alternative mechanism that is responsible for the anticorrelation. At intensities below the recollision threshold, recollision excitation can only take place when the barrier of the Coulomb potential is sufficiently suppressed by the electric field. The excited electron begins to ionize at a “delayed” recollision time after a crossing of the field and hence the probability of being tunnel-ionized after the subsequent peak of the field is increased. It is demonstrated that the “delayed” recollision time predominantly determines the parallel momentum distribution of the tunneling electron and plays a decisive role in forming anticorrelation.
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