Abstract

Term values and oscillator strengths in highly ionized ions of the iron period are calculated via the Slater theory of atomic structure and are used to identify laboratory spectra of 3s2 3pn-3s2 3pn-1 4s, 5s, 4d, 5d transitions in the argon, chlorine and sulphur isoelectronic sequences. New classifications are made in argon, scandium, titanium, vanadium, manganese and iron. The isoelectronic data and the theoretical calculations are used to identify lines in the solar spectrum between 50 and 110 Angstrom. The calculated oscillator strengths of resonance transitions in Fe IX to Fe XIV and Ni XI to Ni XIV are tabulated.

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