Energy Levels of Doubly Excited States in Argon

Term energies of doubly excited states in argon and argon ions have been determined using single-configuration Hartree-Fock calculation. The energies calculated for KL3s3p⁶nl and KL3s⁶3p⁴nln1 states of Ar show a fairly good agreement with the experimental results obtained by various techniques. However, for Ar+, Ar²+, Ar²+ and Ar³+ states there are no experimental data available in the literature for comparison.