Internal collision induced strong-field nonsequential double ionization in molecules

被引:24
作者
Tong, Aihong [1 ]
Li, Qianguang [2 ]
Ma, Xiaomeng [3 ]
Zhou, Yueming [3 ]
Lu, Peixiang [3 ,4 ]
机构
[1] Hubei Univ Educ, Dept Phys & Mech & Elect Engn, Wuhan 430205, Hubei, Peoples R China
[2] Hubei Engn Univ, Sch Phys & Elect Informat Engn, Xiaogan 4320, Peoples R China
[3] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China
[4] Wuhan Inst Technol, Hubei Key Lab Opt Informat & Pattern Recognit, Wuhan 430205, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
CORRELATED ELECTRON DYNAMICS; ENHANCED IONIZATION; EMISSION; IONS;
D O I
10.1364/OE.27.006415
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Using the classical ensemble method, we have investigated the alignment dependence of the correlated electron dynamics in strong-field nonsequential double ionization (NSDI) of diatomic molecules driven by linearly polarized laser pulses. Our numerical results show that the correlated electron pairs are more likely to emit into the same hemisphere (side-by-side emission) for the parallel aligned molecules at the small internuclear distance, in agreement with previous experimental results. Surprisingly, as the internuclear distance increases, this side-by-side emission is more prevalent for the perpendicularly aligned molecules. Back analyzing of the classical trajectories shows that a considerable part of the NSDI events for the parallel aligned molecules at the large internuclear distances occur through an internal collision, not the well-known recollision. In the internal collision induced NSDI, the first electron tunnels through the inner barrier from the up-field core, moves directly towards the other core, and kicks out the second electron. For this type of NSDI events, the electron pairs are more likely to emit into the opposite hemispheres and thus the correlated electron momentum spectrum exhibits a more dominant back-to-back behavior in the parallel aligned molecules. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码:6415 / 6425
页数:11
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