Electron angular correlation in nonsequential double ionization of molecules by counter-rotating two-color circularly polarized fields.
Electron angular correlation in nonsequential double ionization of molecules by counter-rotating two-color circularly polarized fields.
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DOI：
10.1364/oe.439864
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发表时间：
2021-08
期刊：
影响因子：
3.8
通讯作者：
Zhen-Cheng Chen;Jie Su;X. Zeng;Xuefei Huang;Yingbin Li;Cheng Huang
中科院分区：
文献类型：
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作者：
Zhen-Cheng Chen;Jie Su;X. Zeng;Xuefei Huang;Yingbin Li;Cheng Huang
采用三维经典系综模型研究了反转双色圆极化（TCCP）场作用下分子非顺序双电离（NSDI）中的电子关联。数值结果表明，在反旋转TCCP场中，来自分子NSDI的两个电子表现出很强的角关联，且角关联行为对核间距有很强的依赖性.随着核间距的增大，电子对的主导行为由关联向反关联演化。它在离子动量分布上留下了清晰的印记，在小的核间距处呈现倒Y形分布，在大的核间距处呈现三角形分布。反分析表明，软电离导致的电子能量不对称共享和双电离延迟时间的延长是导致大核间距下反关联辐射增加的主要原因。
Electron correlation in nonsequential double ionization (NSDI) of molecules by counter-rotating two-color circularly polarized (TCCP) fields is investigated with a three-dimensional classical ensemble model. Numerical results indicate that the two electrons from NSDI of molecules in counter-rotating TCCP fields show strong angular correlation and the angular correlation behavior sensitively depends on the internuclear distance. With the internuclear distance increasing, the dominant behavior of electron pairs evolves from correlation to anti-correlation. It leaves a clear imprint on the ion momentum distributions, which exhibit an inverted Y-shape distribution at a small internuclear distance and a triangle-shape distribution at a large internuclear distance. Back analysis indicates that the asymmetric electron energy sharing by soft recollision and longer time delay of double ionization are responsible for more anti-correlated emissions at large internuclear distances.