Revisiting the recollisional excitation-tunneling process in strong-field nonsequential double ionization of helium
Revisiting the recollisional excitation-tunneling process in strong-field nonsequential double ionization of helium
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重新审视氦强场非顺序双电离中的重碰撞激发隧道过程
DOI：
10.1103/physreva.100.023405
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发表时间：
2019-08
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;Wang Yali;Morishita Toru;Hao Xiaolei;Chen Jing;Zatsarinny Oleg;Bartschat Klaus
本文研究了氦原子在800 nm激光场中的非顺序双电离（NSDI）过程中的激发隧穿过程。利用改进的定量再散射（QRS）模型计算了关联的两电子动量分布，该模型考虑了电离瞬间电场的存在对阈值能量的降低.在QRS模型的框架下，NSDI中激发隧穿的相关双电子动量分布可以分解为返回电子波包（RWP）和电子碰撞激发母离子的无场微分截面（DCS）乘以激发态电子的隧穿电离率的乘积。描述返回电子动量分布的RWP在高阶阈上电离的强场近似下得到。采用最新的多电子R矩阵理论计算了He+的电子碰撞激发的DCS，并通过求解含时薛定谔方程计算了激发态电子的隧穿电离率.计算的关联双电子动量分布表明，四重对称的平行动量分量被打破。这与普遍认为NSDI中激发隧穿的相关模式相对于坐标轴对称的观点相矛盾。通过考虑（e，2e）过程，我们发现，计算的关联双电子动量分布与实验定性一致.
We revisit the excitation-tunneling process in nonsequential double ionization (NSDI) of helium in an 800-nm laser field. The correlated two-electron momentum distributions are calculated by using the improved quantitative rescattering (QRS) model, in which the lowering of the threshold energy due to the presence of an electric field at the instant of recollision is taken into account. In the framework of the QRS model, the correlated two-electron momentum distributions for excitation-tunneling in NSDI can be factorized as a product of the returning-electron wave packet (RWP) and the field-free differential cross section (DCS) for electron impact excitation of the parent ion multiplied by the tunneling ionization rate of electrons in the excited states. The RWPs, which describe the momentum distribution of the returning electrons, are obtained within the strong-field approximation for high-order above-threshold ionization. The DCSs for electron impact excitation of He+ are calculated using the state-of-the-art many-electron R-matrix theory, and the tunneling ionization rates for electrons in the excited states are evaluated by solving the time-dependent Schrodinger equation. The calculated correlated two-electron momentum distribution shows that the fourfold symmetry with regard to the parallel momentum components is broken. This is in contradiction to the prevalent view that the correlation pattern for excitation-tunneling in NSDI is symmetric with respect to the coordinate axes. By including the recollisional (e,2e) process, the predicted correlated two-electron momentum distributions are found to be in good qualitative agreement with experiment.
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