In the close coupling (CC) approximation the total wave function of the electron-ion system is represented as
The CC expansion for this calculation includes 49 LS terms of the target ion Ni III. The atomic structure code SUPERSTRUCTURE (Eissner et al. 1974; Eissner 1991) was used to compute eigenfunctions for the target states dominated by the configurations , , and . Table 1 presents the complete list of states included in the target, as well as a comparison between the calculated target term energies and the observed energies, averaged over the fine structure, taken from Sugar & Corliss (1985). The agreement between the energies is good; in all but the lowest five terms the agreement with the experimental values is better than 9%. The overall agreement is approximately 5%. Another indicator of the accuracy of the target representation is the good agreement between the length and the velocity oscillator strengths (f-values), which for the present case is typically .
Spectroscopic: , , .
Correlation: , , ,, , ,, , ,.
: 1.43121(1s), 0.93950(2s), 1.28641(2p), 1.15714(3s), 1.02417(3p), 1.01626(3d), 0.97488(4s), 0.96711(4p), 1.26086(4d).
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