Relativistic local spin density functional calculations of dipole oscillator strengths in alkaline earth isoelectronic series

Abstract

The relativistic local spin density functional with correlation energy has been used in conjunction with the concept of Slater transition state to calculate the ( ns→ np) dipole oscillator strength in the isoelectronic series corresponding to Be ( n=2), Mg ( n=3), Ca ( n=4), Sr ( n=5), Ba ( n=6) and Ra ( n=7) respectively. Up to three positive ions have been included in each series. A comparison with experimental and other theoretical values including correlation, relativistic and core polarization effects suggest that LSD approximation leads to reliable estimates of the dipole oscillator strengths.