Isoelectronic smoothing of oscillator strengths in the beryllium sequence

Isoelectronic smoothing of oscillator strengths has recently been suggested as a tool for correlating data obtained for different ions in an isoelectronic sequence. Here the method has been applied to the full range of nuclear charges for which data are available on the resonance transition 2s ^{2 1} S ₀?2s2p ¹ P ₁ ⁰ in the beryllium sequence (Z=4–26). A subset of data is determined which agrees very well with the interpolation curve thus established.