State-selective single electron capture in slow N+-He collisions

Subjects: Physics >> Nuclear Physics Subjects: Physics >> Atomic and Molecular Physics submitted time 2024-02-22

Xing, Dadi Cui, Shucheng Zhu, Xiaolong Zhang, Denghong Zhang, Shaofeng Ma, Xinwen

Abstract： The state-selective single-electron capture process in the collision of N⁺ ions with He at an energy of 0.64 keV/u has been experimentally studied by the reaction microscopy with a two-fold coincident method, and the state-selective cross-sections and angular distributions of an electron captured into different quantum states of the projectile ions have been obtained. The experimental results show that: the ground state projectile N⁺(³P) captures a 1𝑠 electron from the He target mainly to the 2𝑝 shell, and the contribution to the higher shells can also be observed; the metastable N⁺(⁵S) captures a 1𝑠 electron from the He target mainly to the 2𝑠 shell, with almost no contribution to higher shells. The experimental results are interpreted qualitatively using the potential energy curves of the NHe⁺ quasimolecular ion, but the reaction window predictions of the molecular Coulomb over-barrier model differ significantly from the experiments. During the capture of the target electron into the 2𝑠 orbital by the metastable projectile N⁺(⁵S), a clear oscillatory structure appears in the angular differential cross-section, which is likely to result from Demkov-type transitions.

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