Unexpected transitions induced by spin-dependent, hyperfine and external magnetic-field interactions

Research output: Contribution to journalArticle


Unexpected transitions are induced by weaker interactions not included in the gross structure model of the ion under investigation. We discuss different examples of such decay channels, starting with relativistic spin-induced transitions. These represented an important field of study a few decades ago, and we illustrate how some challenging cases can be treated very accurately with today's computational techniques, while close degeneracy sometimes still prevents ab initio methods from obtaining accurate results. For hyperfine induced transitions we review some recent results and discuss remaining challenges for experiment and theory. Finally, we discuss the newly opened field of accurate calculations for transitions induced by an external magnetic field and point to some examples of where these are accessible for experimental tests.


  • Jon Grumer
  • Tomas Brage
  • Martin Andersson
  • Jiguang Li
  • Per Jonsson
  • Wenxian Li
  • Yang Yang
  • Roger Hutton
  • Yaming Zou
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics


  • atomic structure, unexpected transitions, magnetic-field effects, angular distribution of radiation, hyperfine effects
Original languageEnglish
Article number114002
JournalPhysica Scripta
Issue number11
Publication statusPublished - 2014
Publication categoryResearch

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Mathematical Physics (Faculty of Science) (011040001), Physics, science (011013100)