Relativistic Hartree-Fock oscillator strengths for the lowest s→ p transitions in the first few members of the Rb(I) and Cs(I) isoelectronic sequences, with allowance for core polarization

Abstract

Relativistic single-configuration Hartree-Fock oscillator strengths for the lowest ns 2 S 1 2 → np 2 P 1 2 , 3 2 transitions in the first few members of the rubidium ( n = 5) and cesium ( n = 6) isoelectronic sequences have been studied, both with and without allowance for core polarization. The effect of polarization of the core of the atom or ion by the valence electron is included by introducing a polarization potential in the one-electron Hamiltonian and by employing the corresponding correction for the dipole-moment operator in the transition matrix element. The results obtained compare well with available experimental data and indicate a significant influence of core-polarization effects on oscillator strengths. The behaviour of the oscillator strengths for the low Z part of the isoelectronic sequences is discussed.