https://doi.org/10.1140/epjd/s10053-022-00522-3
Regular Article – Atomic Physics
Spin–orbit interaction in the HD
ion
1
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980, Dubna, Russia
2
Laboratoire Kastler Brossel, CNRS, ENS-Université PSL, Collège de France, Sorbonne Université, 4 Place Jussieu, 75005, Paris, France
3
Université d’Evry-Val d’Essonne, Université Paris-Saclay, Boulevard François Mitterrand, 91000, Evry, France
Received:
29
August
2022
Accepted:
6
October
2022
Published online:
21
October
2022
We report on progress in calculation of the spin–orbit interaction for the HD molecular ion. This interaction is currently the largest source of theoretical uncertainty in determination of the hyperfine structure of ro-vibrational transition lines. The corrections of order 
are derived and numerically calculated. Theoretical hyperfine intervals are compared with experimental data, and the observed discrepancies are discussed.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
