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Analysis of the and 5s5p6s configurations of four-times ionized iodine: I V

The spectrum of iodine was photographed in the 400-2100 A region on a 3 m normal incidence spectrograph at the Antigonish laboratory using a triggered spark source. The , 5s5p5d and 5s5p6s configurations of four-times ionized iodine (I V) were identified for the first time in the In I isoelectronic sequence. 34 of the 35 possible levels of these odd parity configurations have been established. 176 additional lines have been classified in the I V spectrum. The relativistic Hartree-Fock and least-squares-fitting calculations were carried out using the Cowan code to interpret the observed spectrum. The new observations also lead to the revision of the levels to and respectively.