Abstract
The Mg I-like spectrum Ti XI has been analysed by using the line list of the titanium vacuum-spark spectrum in the region 50 to 425 Å published by Svensson and Ekberg. At the same time the iso-electronic spectra of potassium, calcium and scandium have been checked and extended. The main new results concern the singlets, but the triplet systems have also been improved. Intersystem combinations have been found for Ca IX, and the singlet-triplet connection for the other element has been established by interpolation. The np- and nd-series are now extended to n=7 and the nf-series to n=6. However, series perturbations affect the determination of the ionization energies, which causes an uncertainty of 0.08% to 0.05%.
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