Spectra of W VIII and W IX in the EUV Region

Alexander Ryabtsev , Edward Kononov , Rimma Kildiyarova , W.-Ü.L. Tchang-Brillet (1) , Jean-François Wyart (1) , Norbert Champion (1) , Christophe Blaess (1)

1 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique

The results obtained on the W VIII spectrum as well as on the isoelectronic spectra Lu V, Hf VI, Ta VII, and Re IX in the VUV wavelength region are summarized with emphasis on the main trends along the isoelectronic sequence. A total of 187 lines of W VIII in the region of 160-271 Å were accurately measured and identified, 98 levels were found, and transition probabilities calculated. The isoelectronic regularities support the data on W VIII. A list of spectral lines in the region of 170-199 Å, considered as belonging to W IX, is presented.

Mots clés: atomic data for tungsten; vacuum ultraviolet; ion spectra; wavelengths; energy levels; transition probabilities; parametric calculations

Domaines: Physique [physics]; Astrophysique [astro-ph]

Alexander Ryabtsev, Edward Kononov, Rimma Kildiyarova, W.-Ü.L. Tchang-Brillet, Jean-François Wyart, et al.. Spectra of W VIII and W IX in the EUV Region. Atoms, 2015, 3 (3), pp.273-298. ⟨10.3390/atoms3030273⟩. ⟨hal-02400847⟩