Energy levels belonging to a system of three newly identified configurations of singly ionized gadolinium are established. This system is obtained by adding to the 7F term of the 4f8 core the 6s, 6p, and 5d electrons. The lowest level of this system, designated at of 4f8(7F)6s, lies 7992.31 cm−1 above the ground level. Transitions connecting the new system to the ground configuration strictly obey the selection rule ΔSI = 0, where SI is the parent spin. Coupling calculations furnish the theoretical basis for this selection rule and explain the unusual intensity relations found experimentally in the infrared. Energy levels for the 4f8(7F)5d and 4f8(7F)6p are designated in L–S and J–J coupling, respectively. Best values for the radial parameters of 4f8(7F)6p are obtained by least-squares calculation, with an rms error of 197 cm−1. About 300 lines are classified.
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