Elastic and electron capture processes in slow He⁺–He collision^★

¹ School of Physics, Beijing Institute of Technology, Beijing 100081, PR China
² Faculty of foundation, Space Engineering University, Beijing 101416, PR China
³ Institute of Applied Physics and Computational Mathematics, Beijing 100088, PR China
e-mail: wu_yong@iapcm.ac.cn; liu_ling@iapcm.ac.cn
⁴ HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100084, PR China

Received: 26 July 2022
Accepted: 19 April 2023

Abstract

Aims. The elastic and electron-capture processes of He⁺ ions with ground helium atoms are very important for studies in astrophysics. It is essential to have reliable state-selective charge transfer, elastic, and transport cross-sections, along with the corresponding reaction rate coefficient data, especially for low collision energies.

Methods. We investigated the elastic and non-radiative electron-capture processes in He⁺(1s)–He(1s²) collisions are investigated employing the full quantum-mechanical molecular orbital close-coupling method. The adopted ab initio adiabatic potentials and coupling matrix elements were obtained by a multi-reference single- and double-excitation configuration interaction approach.

Results. We computed the elastic, charge-transfer, and transport cross-sections in the energy range of 0.01–2500eVamu⁻¹ and the reaction rate coefficient in the temperature range of 10–10⁹ K. Good agreement was achieved when compared to the available experimental and theoretical results. Shape resonance, Regge, and Glory oscillations were also found in the elastic and charge transfer cross-sections in the energy region considered here.