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Spin- and state-resolved charge transfer and excitation in low-energy He+-Na(3s,3p) collisions |
| Xiao-Xia Wang(王小霞)1, Rui Tang(唐瑞)1, Li Ma(马丽)1, Chuan-Yu Zhang(张传瑜)1, Jian-Guo Wang(王建国)2, and Yi-Zhi Qu(屈一至)3,† |
1 College of Physics, Chengdu University of Technology, Chengdu 610059, China;
2 Data Center for High Energy Density Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
3 College of Material Sciences and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract We present a theoretical study of charge-transfer (CT) and electron-excitation (EX) processes in collisions of He$^+$ with Na(3s) and Na(3p) using the quantum-mechanical molecular-orbital close-coupling (QMOCC) method. Adiabatic potential curves together with the corresponding radial and rotational nonadiabatic couplings are calculated for both singlet and triplet spin manifolds. State-resolved results show that, for He$^+$-Na(3s) collisions, the CT process is mainly governed by long-range Demkov-type interactions, with electron capture predominantly populating the He(1s2s) triplet state, while excitation cross sections are smaller and occur at shorter internuclear distances. In the He$^+$-Na(3p) system, additional $\Pi$-symmetry channels participate in the dynamics, leading to dominant capture into the He(1s2p) state. Despite the different initial electronic configurations, the total CT cross sections for Na(3p) are comparable in magnitude to those for Na(3s), with $\Sigma $-symmetry channels contributing more efficiently than $\Pi $ channels. The calculated total CT cross sections for Na(3s) and Na(3p) are on the order of $10^{-18}$-$10^{-14}$ cm$^2$ and agree with the experimental data within deviations of about 5% and 10%-20% in the overlapping energy range. The present results show good agreement with available experimental and theoretical data, providing a comprehensive description of the state-resolved collision dynamics in the low- and intermediate-energy regimes.
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Received: 20 March 2026
Revised: 09 May 2026
Accepted manuscript online: 20 May 2026
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PACS:
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34.70.+e
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(Charge transfer)
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34.20.-b
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(Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774344, 12204288, and 12504293). |
Corresponding Authors:
Yi-Zhi Qu
E-mail: yzqu@ucas.ac.cn
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Cite this article:
Xiao-Xia Wang(王小霞), Rui Tang(唐瑞), Li Ma(马丽), Chuan-Yu Zhang(张传瑜), Jian-Guo Wang(王建国), and Yi-Zhi Qu(屈一至) Spin- and state-resolved charge transfer and excitation in low-energy He+-Na(3s,3p) collisions 2026 Chin. Phys. B 35 073402
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