The - intercombination line in the Be-like sequence

Abstract

Results from systematic multiconfiguration Hartree - Fock studies of the - transitions in the Be-like sequence in the range of Z = 4 - 10 are reported for valence and core-valence models of correlation. The inclusion of core - valence correlation was essential for obtaining good agreement for the fine-structure splitting. The most accurate transition rates are in good agreement with the rates predicted from a semi-empirical analysis of experimental data.