Fifty seven new electron levels of odd parity in neutral praseodymium are presented. These have been found on the basis of an analysis of hitherto unclassified spectral lines with the method of laser-induced fluorescence (LIF). For all the levels the hyperfine magnetic dipole interaction constants A have been determined.
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.
Within this work measurements of the hyperfine structure constants for more than 100 electron levels belonging to the odd configurations of the lanthanum atom have been performed with the method of laser induced fluorescence in a hollow cathode discharge. Almost half of these levels have not been investigated before. The results have been obtained from the analysis of several hundreds of spectral lines.
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