New Configurations in Triply Ionized Indium(In IV)

Abstract

The emission spectrum of triply ionized indium has been photographed over a spectral range from 340 to 7000 Å using disruptive electrodeless discharge and spark in helium sources. In addition to corrections and revisions of previous analyses, new configurations have been identified. The analysis is extended to include terms belonging to 4d95d, 4d85s2, and 4d9ns (n = 5, 6, and 7). Tentative values are given to several levels of 4d85s5p, 4d94f, 4d96p, and 4d96d. Houston's theory of intermediate coupling has been applied to 4d9ns terms. The double limit of In IV is calculated from the 4d9ns series. In all, 67 energy levels have been established to classify a total of 340 lines.