On The Spectra of Doubly Ionized Arsenic Antimony and Bismuth (As III, Sb III, Bi III)

The spectra of the elements As III, Sb III and Bi III have been partially analyzed by the use of the irregular doublet law and the Moseley law and the published data for the two preceding elements of each iso-electronic sequence. In As III and Bi III the important terms from the configurations $n{s}^2\mathrm{np}$, $n{s}^2\mathrm{nd}$, $n{s}^2\mathrm{}(n+1\mathrm{})s$ have been located and with the exception of the quartet $P$ terms, those from the $\mathrm{nsn}{p}^2$ configuration. ($n$ is equal to 4 for As III, 5 for Sb III and 6 for Bi III.) In As III alone the ${}_{}{}^2{}_{}{}^{}P$ term of the $n{p}^3$ configuration was found. The terms of Sb III located consist of some of those for the first three configurations only.