Abstract

The groups of six levels obtained by adding, in <i>J</i>-<i>j</i> coupling, a 6<i>p</i> electron to the lowest level of the 4ƒ<sup><i>N</i>-1</sup> core have been identified in gadolinium, dysprosium, erbiumr, and ytterbium (<i>N</i> = 8, 9, 12, 14). They account for strong transitions to the corresponding 4ƒ<sup><i>N</i>-1</sup>5<i>s</i>6<i>s</i><sup>2</sup> configurations. Values for the spin-orbit parameter of the 6<i>p</i> electron are (in cm<sup>-1</sup>) ζ<sub><i>p</i></sub> = 1835, 1840, 2049, 2257, respectively.

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