Energy levels for L-shell ions of sulfur & argon

The calculations were performed with the relativistic Multi-Reference Moller-Plesset Perturbation Theory method (MR-MP). The data set includes all the level energies with configurations 1s^2^2(s,p)^q^, 1s^2^2(s,p)^q-1^nl, 1s^1^2(s,p)^q+1^, 1s^1^2(s,p)^q^nl, 2(s,p)^q+2^, and 2(s,p)^q+1^nl, where 1<=q<=8, n<=5, and l<=3.

We have compared our results with data from the National Institute of Standards and Technology (NIST) online database and with previous calculations. The average deviation of valence level energies ranges from 0.16eV in Ne-like ions to 0.01eV in Li-like ions, showing that the present MR-MP valence level energies are highly accurate. In the case of K-vacancy states, the deviation is generally below 0.3eV for Li-like SXIV and ArXVI.