The ground terms in the spectra cobalt IV, nickel V and copper VI

Abstract

The levels of the lowest term, ⁵D, in the 3d⁶ configuration and the levels of the 3d⁵ (⁶S) 4p ⁵P⁰ in the spectra of Co IV, Ni V and Cu VI have been established. A comparison is made between the intervals in these multiplets in the isoelectronic sequence Cr I-Cu VI. Predictions are given for the analogous intervals in Zn VII and the wavelength region of the corresponding lines in that spectrum.