Measurements and data-based predictions for Δ<i>n</i>=1 resonance and intercombination transitions in the Be and Ne sequences

Abstract

Earlier studies of line strengths for ${\mathit{ns}}^{2}$ $^{1}$${\mathit{S}}_{0}$--nsn'p $^{1,3}$${\mathit{P}}_{1}$ resonance and intercombination transitions for intrashell (n'=n) cases have revealed isoelectronic regularities that have been used to make accurate predictions along the sequence. Although lifetime data exist for intershell (n'&gt;n) cases, the lack of branching ratio measurements has until now prevented similar analyses. Through new lifetime measurements, a critical evaluation of the available data, and determinations of branching fractions from a differential measurement and from calculational considerations, we have extended these methods to systematize and predict line strengths for \ensuremath{\Delta}n=1 resonance and intercombination transitions in the Be and Ne sequences.