Calculated wavelengths, oscillator strengths, and energy levels for allowed 3-3 and 3–4 transitions for ions in the S-like isoelectronic sequence between S I and Ni XIII

Abstract

Wavelengths and oscillator strengths are calculated for 3 s 23 p 4-3 s3 p 5, 3 s 23 p 4-3 s 23 p 33 d, and 3 s 23 p 4-3 s 23 p 34 s transitions, and energy levels for the 3 s 23 p 33 d configuration, of ions in the S I isoelectronic sequence between S I and Ni XIII. Measured wavelengths are also listed for 3 s 23 p 4-3 s 23 p 33 d transitions. Enhanced accuracy is obtained through the optimization of Slater parameters previously calculated ab initio with a Hartree-Fock-Relativistic program package which uses the Blume-Watson method for spin-orbit interactions. Dominant configuration interactions are taken into account. A Multiconfiguration-Dirac-Fock program is applied to check the accuracy of the ab initio calculations. The tabulated data highlight contemporary problems in atomic physics and are of interest in studies of the solar spectrum.