Analysis of the 5s²5p², 5s5p³, 5s²5p5d and 5s²5p6s configurations of I IV

Abstract

The spectrum of iodine was photographed in the 400-2000 AA wavelength region on 3 m, 6.5 m and 10.7 m normal incidence spectrographs using triggered spark and sliding spark sources. On the basis of these observations all levels of the 5s25p2, 5s5p3 and 5s25p6s configurations and all but one level (J=4) of the 5s25p5d configuration in I IV have been established. An earlier analysis has been found completely incorrect. Multiconfiguration interaction calculations were used to interpret and confirm the analysis; 74 lines have been classified in this spectrum.