CRITICAL SURVEY OF THE LOW CONFIGURATIONS IN BE I-LIKE SPECTRA

Available measurements of the transitions 2s2−2s2p and 2s2p-2p2are examined as to their iso-electronic consistency by studying appropriate functions of the transition energies of 2s21S0−2s2p 1P1, 3P1, 2s2p 1P1−2p21D2, 1S0and 2s2p 3P2−2p23P2, and by deriving semi-empirical screening formulae for the fine-structure intervals of the 3P terms. In this way, accidental experimental errors are smoothed out and missing data are determined by interpolation. The results of the analysis are comprised in a table of recommended level values, extending to Z = 26 or, for 2s2p 1P1, 3P1, to Z = 28. A comment on our recent discussion of the Li I-like spectra is appended. © 1979 IOP Publishing Ltd.