Abstract
The energy levels of singly ionized neodymium (Nd II) are interpreted following the Racah–Slater parametric method, by using the Cowan computer codes. Radial parameters obtained in a least-squares fit are compared with Hartree–Fock (HFR) ab initio integrals. In the odd parity, 596 levels of the mixed configurations 4f35d6s, 4f35d2, 4f36s2, 4f46p and 4f5 are used to determine 39 free parameters, 51 other parameters being constrained. The mean error is 53 cm- 1. The configuration sharing of the levels is supported by the experimental isotope shifts 144Nd–150Nd.
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