Radiative charge transfer and association in slow Li⁻ + H collisions

¹ School of Physics, Beijing Institute of Technology, 100081 Beijing, PR China
² Data Center for High Energy Density Physics, Institute of Applied Physics and Computational Mathematics, PO Box 8009, 100088 Beijing, PR China
e-mail: wu_yong@iapcm.ac.cn
³ Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, 230026 Anhui, PR China
⁴ Macedonian Academy of Sciences and Arts, PO Box 428, 1000 Skopje, Macedonia

Received: 21 July 2016
Accepted: 12 September 2016

Abstract

Aims. The radiative charge transfer and association processes in Li⁻ + H collisions are studied in the 10^-10−10 eV center-of-mass energy range.

Methods. we carried out total and ν-resolved state-selective cross sections have been carried out by using the fully quantum, optical potential, and semiclassical methods.

Results. In the energy region below ~ 0.8 eV, the radiative association process is the dominant decay channel, while radiative charge transfer dominates at higher energies. Rich resonance structures are observed in the cross sections of both processes in the 0.1−1.5 eV energy range; These structures are associated with the quasi-bound states below the top of the centrifugal barrier of the effective potential in the entrance channel for specific vibrational and angular momentum states. It is found that with the increase of collision energy, the resonances occur for higher angular momentum states and lower vibrational states. Besides the cross sections for the studied processes we also present their reaction rate coefficients in the 10^-6–10⁶K temperature range.