Calculation of energy differences and oscillator strengths for the electric-dipole transitions of sulphur

Abstract

A large-scale configuration interaction (CI) calculation has been performed for the sulphur atom to obtain excitation energies and oscillator strengths of some electric-dipole transitions. In the calculation, relativistic effects were included through the Breit - Pauli approximation. A fine-tuning technique was used for the adjustment of the diagonal matrix elements to achieve accurate transition energies and coefficients of the CI wavefunctions. The calculated excitation energies are mostly within 1% of the measurements. The agreement between the length and velocity forms of the oscillator strengths is also very good.