Effective Interactions in the Even Configurations of the Third Spectra of the Iron Group

Four hundred eighty-three levels belonging to the configurations 3d n + 3d n-14s of all third spectra of the iron group were calculated, and 334 observed levels were fitted to them. In addition to the usually used approximation, we first introduced a complete set of two-body and three-body effective-interaction parameters between 3d electrons. Using only two-body effective interactions, we obtained arms error of 175 cm-1; while the addition of three-body effective interactions reduced the rms error to 46 cm-1. When a parameter representing three-body effective interaction between 3d and 4s electrons was also introduced, the rms error was reduced to 38 cm-1.

The Configurations 3d n 4p in Doubly Ionized Atoms of the Iron Group

Experimental levels of the configurations 3d ⁿ 4p in the third spectra of the iron group were compared with corresponding calculated values. Besides the electrostatic and spin-orbit interactions the αL(L + 1), βQ and T corrections were considered in the individual and general treatments. The insertion of the parameters β and T improved the results by about 25 percent. The root-mean-square (rms) error on fitting 581 experimental levels by means of 21 free interaction parameters was 138 cm^-1. Altogether 912 energy levels were predicted.

The Configurations 4d n + 4d n - 1 5s in Doubly-Ionized Atoms of the Palladium Group

Four hundred and eighty-three energy levels belonging to the low even configurations of the third spectra of the palladium group are predicted by the use of interpolation formulas for the interaction parameters.