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Internal collision double ionization of molecules driven by co-rotating two-color circularly polarized laser pulses |
| Xue-Feng Li(李雪峰)1,2, Yue Qiao(乔月)1,2, Dan Wu(吴丹)3, Rui-Xian Yu(蔚瑞贤)1,2, Ji-Gen Chen(陈基根)4, Jun Wang(王俊)1,2, Fu-Ming Guo(郭福明)1,2, and Yu-Jun Yang(杨玉军)1,2,† |
1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy(Jilin University), Changchun 130012, China;
3 School of Science, Jilin Institute of Chemical Technology, Jilin 132022, China;
4 Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Jiaojiang 318000, China |
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Abstract The double ionization process of molecules driven by co-rotating two-color circularly polarized fields is investigated with a three-dimensional classical ensemble model. Numerical results indicate that a considerable part of the sequential double ionization (DI) events of molecules occur through internal collision double ionization (ICD), and the ICD recollision mechanism is significantly different from that in non-sequential double ionization (NSDI). By analyzing the results of internuclear distances R=5 a.u. and 2 a.u., these two recollision mechanisms are studied in depth. It is found that the dynamic behaviors of the recollision mechanisms of NSDI and ICD are similar. For NSDI, the motion range of electrons after the ionization is relatively large, and the electrons will return to the core after a period of time. In the ICD process, electrons will rotate around the parent ion before ionization, and the distance of the electron motion is relatively small. After a period of time, the electrons will come back to the core and collide with another electron. Furthermore, the molecular internuclear distance has a significant effect on the electron dynamic behavior of the two ionization mechanisms. This study will help to understand the multi-electron ionization process of complex systems.
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Received: 28 June 2023
Revised: 13 August 2023
Accepted manuscript online: 01 September 2023
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PACS:
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33.20.Xx
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(Spectra induced by strong-field or attosecond laser irradiation)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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| Fund: We acknowledge the National Key Research and Development Program of China (Grant No. 2019YFA0307700), the National Natural Science Foundation of China (Grant Nos. 12074145 and 11975012), Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20220101003JC), and Jilin Provincial Education Department (Grant No. JJKH20230284KJ). The authors acknowledge the High Performance Computing Center of Jilin University for supercomputer time and the high performance computing cluster Tiger@IAMP. |
Corresponding Authors:
Yu-Jun Yang
E-mail: yangyj@jlu.edu.cn
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Cite this article:
Xue-Feng Li(李雪峰), Yue Qiao(乔月), Dan Wu(吴丹), Rui-Xian Yu(蔚瑞贤), Ji-Gen Chen(陈基根), Jun Wang(王俊), Fu-Ming Guo(郭福明), and Yu-Jun Yang(杨玉军) Internal collision double ionization of molecules driven by co-rotating two-color circularly polarized laser pulses 2024 Chin. Phys. B 33 013302
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