The Spectrum of Iodine Excited in the Presence of Argon

Iodine vapor was excited by an uncondensed transformer discharge in the presence of argon. A new band system $\lambda 2785-2750$A is recorded. In addition a large number of new bands are found in the band systems $\lambda 3455-3015$A, $\lambda 2730-2520$A, and $\lambda 4420-4000$A reported by earlier workers. These band systems are analyzed and explained in terms of the fairly well-established term scheme of the iodine molecule. The absorption data in the region $\lambda 2000-3500$A are discussed in the light of the present results.