Fragmentation dynamics of electron-impact double ionization of helium

doi:10.1088/1674-1056/acbe33

中国物理B ›› 2023, Vol. 32 ›› Issue (6): 63402-063402.doi: 10.1088/1674-1056/acbe33

所属专题： SPECIAL TOPIC — Celebrating the 100th Anniversary of Physics Discipline of Xiamen University

Fragmentation dynamics of electron-impact double ionization of helium

Shiwei Liu(刘士炜)¹, Difa Ye(叶地发)^1,2,†, and Jie Liu(刘杰)^3,4,‡

1 Beijing Computational Science Research Center, Beijing 100193, China;
2 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
3 Graduate School, China Academy of Engineering Physics, Beijing 100193, China;
4 HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University, Beijing 100871, China

收稿日期:2023-01-11 修回日期:2023-02-05 接受日期:2023-02-23 出版日期:2023-05-17 发布日期:2023-05-17
通讯作者: Difa Ye, Jie Liu E-mail:ye_difa@iapcm.ac.cn;jliu@gscaep.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12174034, 12047510, and 11822401) and NSAF (Grant Nos. U1930402 and U1930403).

Fragmentation dynamics of electron-impact double ionization of helium

Shiwei Liu(刘士炜)¹, Difa Ye(叶地发)^1,2,†, and Jie Liu(刘杰)^3,4,‡

1 Beijing Computational Science Research Center, Beijing 100193, China;
2 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
3 Graduate School, China Academy of Engineering Physics, Beijing 100193, China;
4 HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University, Beijing 100871, China

Received:2023-01-11 Revised:2023-02-05 Accepted:2023-02-23 Online:2023-05-17 Published:2023-05-17
Contact: Difa Ye, Jie Liu E-mail:ye_difa@iapcm.ac.cn;jliu@gscaep.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12174034, 12047510, and 11822401) and NSAF (Grant Nos. U1930402 and U1930403).

摘要/Abstract

摘要： We study the double ionization dynamics of a helium atom impacted by electrons with full-dimensional classical trajectory Monte Carlo simulation. The excess energy is chosen to cover a wide range of values from 5 eV to 1 keV for comparative study. At the lowest excess energy, i.e., close to the double-ionization threshold, it is found that the projectile momentum is totally transferred to the recoil-ion while the residual energy is randomly partitioned among the three outgoing electrons, which are then most probably emitted with an equilateral triangle configuration. Our results agree well with experiments as compared with early quantum-mechanical calculation as well as classical simulation based on a two-dimensional Bohr's model. Furthermore, by mapping the final momentum vectors event by event into a Dalitz plot, we unambiguously demonstrate that the ergodicity has been reached and thus confirm a long-term scenario conceived by Wannier. The time scale for such few-body thermalization, from the initial nonequilibrium state to the final microcanonical distribution, is only about 100 attoseconds. Finally, we predict that, with the increase of the excess energy, the dominant emission configuration undergoes a transition from equilateral triangle to T-shape and finally to a co-linear mode. The associated signatures of such configuration transition in the electron-ion joint momentum spectrum and triple-electron angular distribution are also demonstrated.

关键词: double ionization, classical trajectory Monte Carlo simulation, Wannier threshold law, ergodicity

Abstract: We study the double ionization dynamics of a helium atom impacted by electrons with full-dimensional classical trajectory Monte Carlo simulation. The excess energy is chosen to cover a wide range of values from 5 eV to 1 keV for comparative study. At the lowest excess energy, i.e., close to the double-ionization threshold, it is found that the projectile momentum is totally transferred to the recoil-ion while the residual energy is randomly partitioned among the three outgoing electrons, which are then most probably emitted with an equilateral triangle configuration. Our results agree well with experiments as compared with early quantum-mechanical calculation as well as classical simulation based on a two-dimensional Bohr's model. Furthermore, by mapping the final momentum vectors event by event into a Dalitz plot, we unambiguously demonstrate that the ergodicity has been reached and thus confirm a long-term scenario conceived by Wannier. The time scale for such few-body thermalization, from the initial nonequilibrium state to the final microcanonical distribution, is only about 100 attoseconds. Finally, we predict that, with the increase of the excess energy, the dominant emission configuration undergoes a transition from equilateral triangle to T-shape and finally to a co-linear mode. The associated signatures of such configuration transition in the electron-ion joint momentum spectrum and triple-electron angular distribution are also demonstrated.

Key words: double ionization, classical trajectory Monte Carlo simulation, Wannier threshold law, ergodicity

中图分类号: (General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.))

34.10.+x

34.80.-i (Electron and positron scattering) 34.50.Fa (Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))

Shiwei Liu(刘士炜), Difa Ye(叶地发), and Jie Liu(刘杰). Fragmentation dynamics of electron-impact double ionization of helium[J]. 中国物理B, 2023, 32(6): 63402-063402.

Shiwei Liu(刘士炜), Difa Ye(叶地发), and Jie Liu(刘杰). Fragmentation dynamics of electron-impact double ionization of helium[J]. Chin. Phys. B, 2023, 32(6): 63402-063402.

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Fragmentation dynamics of electron-impact double ionization of helium

Fragmentation dynamics of electron-impact double ionization of helium

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