No abstract

No abstract

In this work the method of quantitative determination of two-body contributions to the fine and the hyperfine structure, resulting from the excitations from electronic closed shells to open shells and from open shells to empty shells, is described. On the basis of experimental data, both our own and that available in the literature, the configuration (5d+6s) 3 in the lanthanum atom is analysed. Our investigations indicate that the operator i (1) r −3 12 + s i r −3 10 • T (1) n does not fully account for the partition of the interactions of rank K =1 into contributions κk = 01, 12 and 10.

In this work results of the laser-induced fluorescence measurements of the hyperfine structure for 22 electronic levels belonging to the odd configurations of lanthanum ion La II, hitherto not investigated or investigated with lower precision, are presented. The results obtained have been applied in semi-empirical calculations of fine and hyperfine structure radial parameters, performed within the basis of 42 configurations.

No abstract