The role of spin–orbit effects in the mobility of N+ ions moving in a helium gas at low temperature★,★★
Laboratoire de Physique des Rayonnements et leurs Interactions avec la Matière, Batna 1 University, Batna 05000, Algeria
2 School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
3 Laboratoire de Physique des Rayonnements, Badji Mokhtar University, B. P. 12, Annaba 23000, Algeria
a e-mail: KnowlesPJ@Cardiff.ac.uk
Received in final form: 3 June 2020
Published online: 23 July 2020
The mobility of N+ ions in ground-state helium gas at very low temperature is examined with explicit inclusion of spin–orbit coupling effects. The ionic kinetics is treated theoretically with the three-temperature model. The N+–He interaction potentials, including spin–orbit coupling, are determined using high-level ab initio calculations. Then, the classical and quantal transport cross sections, both needed in the computation of the mobility coefficients, are calculated in terms of the collisional energy of the N+–He system. The numerical results, at temperature 4.3 K, show the spin–orbit interactions have negligible effect on the mobility coefficients.
Key words: Atomic and Molecular Collisions
Electronic Supplementary Information (ESI) available: All the data points derived from the ab initio potentials of the ground N+–He molecular states, without and with the spin–orbit (SO) effects.
Supplementary material in the form of one pdf file available from the Journal web page at https://doi.org/10.1140/epjd/e2020-10138-0.
© The Author(s) 2020. This article is published with open access at Springerlink.com
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.