Abstract
The energy spectrum of the argon ${3p}^{4}4s4p$ and ${3p}^{4}3d4p$ configurations with a total $J=1$ was calculated within the single-configuration relaxed-core Hartree-Fock approximation. The spin-orbit interaction was included in the calculation. The results indicate strong mixing of the ${}^{1}P$ terms which are the ones allowed to couple to the ground state via electric-dipole excitation. Most experimental lines could be identified using this calculation. The calculated spin-orbit splittings within groups of levels are in very good agreement with experiment. However, differences of the order of 1 eV between experiment and theory were found for the absolute positions of groups of levels.
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