Theoretical analysis of spectra of highly ionized sulfur ions

The wavelengths and weighted oscillator strengths for S8+-S13+ ions were systematically studied by using the relativistic Hartree-Fock method with configuration interaction. Comparison of the available experiment and theoretical calculations were carried out. It is found that the purities of S8+-S11+ states are very high in LS coupling scheme. As the ion charge increases, the levels of the S12+-S13+ atomic states begin to mix, and the effect of configuration interaction (CI) becomes important. Thirty-two spectral lines from 16.8 nm to 45.0 nm are identified, most of which arise from the transitions among the levels of the 2s22pk, 2s2pk+1 and 2pk+2(k=0,1,2,3,4) of S8+-S13+ ions by analyzing the results of the experiment. Most of the absolute error between the calculated results and the expe