Relativistic model-potential oscillator strengths and transition probabilities for [formula omitted] transitions in Eu(II), Tb(II), and Ho(II) in J 1 j coupling

Abstract

The lowest 4ƒ n6s−4ƒ n6p transitions are studied for the Eu( II) ( n=7), Tb( II) ( n=9), and Ho( II) ( n=11) spectra, where the J 1 j coupling is an acceptable approximation. The relativistic radial integrals, required to evaluate the oscillator strengths and transition probabilities, are calculated with the model-potential method, which includes also core-polarization effects. The similarities observed in oscillator strengths for transitions with given Δ J but different J values are discussed and explained. The computer oscillator strengths are compared with those obtained with the Coulomb approximation and it is found that the latter are only 11–12% lower. The core polarization influence on oscillator strengths is also investigated and the 19–21% decrease in oscillator strengths due to this effect is predicted. This result may, however, be overestimated because of some deficiencies in our procedure.