THE 4 f-5 d INTERACTIONS IN SAMARIUM, GADOLINIUM AND TERBIUMReport as inadecuate




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Abstract : The newly established levels of the subconfigurations 4 f67F 5 d of singly ionized samarium Sm II, 4 f87F 5 d of singly ionized gadolinium Gd II and 4 f87F 5 d 6 S2 of neutral terbium Tb I are used to obtain reliable values for the six electrostatic Slater and two spin-orbit interaction parameters around the half filled 4 f shell. Out of 57 possible levels in each case, 54 of Sm+, 45 of Gd+ and 27 of Tb are fitted with an rms error of 168 cm-1 1.24 % of total width, 239 cm-1 1.76 % and 152 cm-l 1.76 % respectively. L-S coupling notations can be used for level designations despite some heavy admixtures. Eigenvectors differring significantly from previously given ones, as well as predictions for missing levels are tabulated. About 70 Gd II lines are classified.





Author: N. Spector

Source: https://hal.archives-ouvertes.fr/



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