Relativistic CI calculations for the ns21S0-nsnp3P1,1P1transitions in the cadmium and mercury isoelectronic sequences

The relativistic configuration interaction approach based on numerical wavefunctions computed with a single-configuration relativistic Hartree-Fock method is employed to calculate ionisation and excitation energies as well as oscillator strengths for the ns 2 1 S 0 -nsnp 3 P 1 , 1 P 1 transitions in cadmium and mercury isoelectronic sequences. The core polarisation model is used to account for valence-core correlation influence on both wavefunctions and total energies. The results are compared with previous relativistic multiconfiguration Hartree-Fock and other theoretical data as well as with available experimental values. It is demonstrated that the proposed relativistic CI approach yields accurate and reliable data at a far smaller computational expense than required for similar scale multiconfiguration calculations. It also permits us to avoid numerous convergence problems common for the multiconfiguration approach.