https://doi.org/10.1140/epjd/s10053-026-01131-0
Research - Atoms, Molecules, Ions, and Clusters
Study of the 
resonance series in B
, N
and F
ions
Laboratoire de Physique Computationnelle et Photonique, Université de Moncton Campus de Shippagan, 216 Boulevard J. D. Gauthier, E8S1P6, Shippagan, NB, Canada
a
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Received:
6
October
2025
Accepted:
6
February
2026
Published online:
27
March
2026
Abstract
We numerically investigate in the present paper the resonance series in the B, N and F ions by using a B-spline-based spectral approach combined with the complex rotation method. We report highly accurate results of the energy positions, widths, natural lifetimes of these states and the precise X-ray photon energies needed to trigger their formation under the 
and 
hydrogenic thresholds and observe their autoionization. The present investigation has succeeded in the localization of new high-lying doubly excited states never reported before by another theoretical method and also in their classification into distinct resonant series that share similar angular correlation pattern.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2026
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.
