Charge transfer in collisions of H+, Li3+, Be4+ and O7+ ions with He atom based on 4-classical trajectory Monte Carlo method

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Abstract

The classical trajectory Monte Carlo (CTMC) method is a common method to study the charge-transfer and impact-ionization cross sections for the collisions between ions and atoms, and the heavy particle collision in astrophysics and laboratory plasma environment. Here in this work, we use the 4-CTMC method to study a four-body collision process including two bound electrons, and the Hamiltonian equation of the four-body dynamic system is solved numerically. The single/double electron ionization and capture cross sections are calculated for collisions of high charge state ions (Li ³⁺, Be ⁴⁺and O ⁷⁺) with helium atom in a wide range of projectile energy. The calculation results show that the results from the 4-CTMC method and the experimental measurements are in better agreement in a projectile energy range of 50－200 keV/amu for proton-helium collision system. In addition, for incident ions with high charge state, the results calculated by the 4-CTMC method are in better agreement with the experimental measurements or other theoretical values in a projectile energy range of 100－500 keV/amu. Though the double ionization and capture cross sections calculated by 4-CTMC or 3-CTMC method are higher than the experimental results due to ignoring the electron correlation, the results from the 4-CTMC method are in better agreement with the experimental results.

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Authors and contacts

Corresponding author:Zhang Sheng,halifaxy@gmail.com; Li Xin-Xia,li_xx@usc.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11775108)

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反应类型		E_CB	E_DB	E_CA	E_DA
双电子激发	C和D被激发	< 0	< 0	≥ 0	≥ 0
双电子俘获	C和D被俘获	≥ 0	≥ 0	< 0	< 0
单电子俘获	C被俘获、D被激发	≥ 0	< 0	< 0	≥ 0
单电子俘获	D被俘获、C被激发	< 0	≥ 0	≥ 0	< 0
双电子电离	C和D被电离	≥ 0	≥ 0	≥ 0	≥ 0
单电子电离	C被电离、D被激发	≥ 0	< 0	≥ 0	≥ 0
单电子电离	D被电离、C被激发	< 0	≥ 0	≥ 0	≥ 0
转移电离	C被电离、D被俘获	≥ 0	≥ 0	≥ 0	< 0
转移电离	D被电离、C被俘获	≥ 0	≥ 0	< 0	≥ 0

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Vol. 71, Issue 3 - 2022-02-05

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