https://doi.org/10.1007/PL00021604
Atomic lifetimes and transition probabilities in boron-like (Na VII) and beryllium-like (Na VIII) sodium ions
1
Institut de Physique Nucléaire Expérimentale, Université de
Liège B15,
Sart Tilman, 4000 Liège, Belgium
2
Astrophysique et Spectroscopie, Université de Mons-Hainaut,
7000 Mons, Belgium
3
Experimentalphysik III, Ruhr-Universität Bochum,
44780 Bochum, Germany
Received:
18
November
1998
Published online: 15 April 1999
Spectra and decay curves of boron-like (Na VII) and beryllium-like (Na
VIII) sodium ions produced by beam-foil excitation have been recorded in the
30–60 nm spectral range and the radiative lifetimes of seven n=2 levels have been
measured. The experimental results are compared with the available theoretical
values and with new results obtained in the framework of two theoretical approaches:
the Relativistic Hartree-Fock approximation and the Multiconfiguration Dirac-Fock
method. Corroborated by the fair agreement of the new theory data with experiment, a
new set of accurate transition probabilities for the 
-
and -
transitions of Na VII is presented.
PACS: 32.70.-n – Intensities and shapes of atomic spectral lines
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
