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Internal collision double ionization of molecules driven by co-rotating two-color circularly polarized laser pulses

Chinese Physics B 2024年第1期33卷 355-361页

作者：李雪峰乔月吴丹蔚瑞贤陈基根王俊郭福明杨玉军 Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Changchun 130012China School of Science Jilin Institute of Chemical TechnologyJilin 132022China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou UniversityJiaojiang 318000China

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.

关键词： non-sequential double ionization internuclear distance internal-collision circularly polarized laser field

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How to measure the internuclear vector from photoelectron angular distributions

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Chinese Physics B 2010年第2期19卷 194-199页

作者：任向河张敬涛王懿徐至展 J.T.Wang D.S.Guo State Key Laboratory for High-Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences Department of Physics Southern University and A&M CollegeBaton RougeLouisiana 70813 USA

This paper uses a nonperturbative scattering theory to study photoelectron angular distributions of homonuclear diatomic molecules irradiated by circularly polarized laser fields. This study shows that the nonisotropic feature of photoelectron angular distributions is not due to the polarization of the laser field but the internuclear vector of the molecules. It suggests a method to measure the molecular orientation and the internuclear distance of molecules through the measurement of photoelectron angular distributions.

关键词： photoelectron angular distributions internuclear distance photoionization

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