The Paschen-Back Effect. VII. Configuration Interaction

Abstract

The spectrum of krypton furnishes a very fine example of the effect of configuration interaction. The levels $3s_5$ and $4d_2$, belonging to configurations of the same parity are less than 1 ${\mathrm{cm}}^{-1\mathrm{}}$ apart, and the Zeeman patterns of lines arising from them show large perturbations, both as regards positions and relative intensities of the components. A semiempirical theory is discussed which leads to excellent agreement with experiment.