## Abstract

Negative ions homologous to N^{-} are interesting systems, since there are several bound terms within the ground configuration. The forbidden transitions between them, often dominated by the magnetic dipole contributions, are affected by term mixing - a relativistic effect. When increasing the nuclear charge in the homologous sequence of negative ions, this effect increases. In this paper we use systematic multiconfiguration Dirac-Hartree-Fock calculations to study these effects and predict affinities, level splittings and transition rates between bound states of N^{-}, P^{-}, As^{-}, Sb^{-} and Bi^{-}. By monitoring the line strengths we are able to predict the deviation from the non-relativistic LS-coupled values for transitions between levels of the lowest ^{3}P term. For Sb^{-} the ^{1}D term is also bound, and the prediction for the rates of its transition to the ^{3}P-levels is a challenge for theory. For Bi^{-} less is known experimentally and we analyze its structure and the relativistic contributions to it.

Original language | English |
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Article number | 125002 |

Pages (from-to) | 1-11 |

Number of pages | 11 |

Journal | Journal of Physics B: Atomic, Molecular and Optical Physics |

Volume | 52 |

Issue number | 12 |

DOIs | |

Publication status | Published - 2019 May 28 |

## Subject classification (UKÄ)

- Theoretical Chemistry

## Keywords

- atomic structure
- bound states
- electron affinity
- forbidden transitions
- lifetimes
- negative ions

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