Zeeman Effect in the Arc Spectrum of Nickel

Measurements of the Zeeman patterns for 113 lines between λ5500 and λ3000 are presented, from which g-factors for 61 terms are calculated. The g-sum rule holds for configuration d⁹s and for d⁸s(²F)·4p, but not for d⁹·4p or d⁸s(⁴F)·5s. It does hold for d⁹·4p and the quintet terms of d⁸s(⁴F)·4p taken together, indicating that these groups interact. It is surmised that d⁸s(⁴F)·5s is perturbed by d⁹·4d. The theory of two-electron systems fits d⁹s very well. It works fairly well with d⁸s², but breaks down when applied to d⁹·4p, probably because of increased importance of the magnetic interactions which are neglected in the theory.