Hyperfine structure and isotope shift in Tl II with astrophysical applications

Research output: Contribution to journalArticle


Fourier transform (FT) spectra of Tl II with resolved hyperfine structure (hfs) have been analyzed in the region 1790-3400 Angstrom. Measured isotope shifts (IS) for two transitions, including the S-1-P-3 intercombination line to the ground state at 1908.6 Angstrom are reported. Accurate Ritz wavelengths for isotope and hyperfine components of the S-1-P-1 resonance line at 1321.6 Angstrom are given. The accuracy is better than 0.3 m Angstrom for measured wavelengths and better than 0.4 m Angstrom for the Ritz wavelengths. Theoretical multi-configuration Dirac-Fock (MCDF) calculations, including core polarization, show that the LS-allowed 1321.6 Angstrom transition is a factor of 30 stronger than the intercombination line at 1908.6 Angstrom. The application of the new Tl II data to astrophysical spectra obtained with the Hubble Space Telescope is discussed.


  • Sveneric Johansson
  • Gabriele Kalus
  • Tomas Brage
  • DS Leckrone
  • Glenn Wahlgren
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology


  • individual (chi Lupi), stars, atomic data, identification, line, ultraviolet
Original languageEnglish
Pages (from-to)943-947
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 1996
Publication categoryResearch