摘要: By means of theoretical energy expressions for the p4f configuration in pair-coupling 16 levels found Cl i by Corliss and Humphreys Paul have been identified as (3P)4f, 5f, 6f levels. Additional pairs that make (3P)4f 5f configurations complete found. The positions remaining (3P)6f are accurately predicted. coupling is to be a pronounced pair coupling, very hydrogenlike. From (3P)nf series new value 3p4 3P2 ionization limit has derived, viz., 104 591 cm−1 above ground level 3p5 P2112.