Improved Wavelengths and Energy Levels of Doubly-Ionized Argon (Ar III).

New measurements of Ar III wavelengths between 508 Å and 4183 Å are combined with measurements from the literature to find improved values for the energy of most of the known levels in Ar III. Parameters derived from fitting the new level energies to an -coupling model are presented along with eigenvector compositions of the levels. On the basis of this analysis new designations are recommended for several levels.