Abstract
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 2s22p-2s2p2 and 2s2p2-2p3 transitions of Na VII is presented.
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