THE SPECTRUM OF IODINE V, VI AND VII - LIFETIME MEASUREMENTS AND ENERGY-LEVEL ASSIGNMENTS

The beam-foil technique has been used to observe the spectrum of iodine in the wavelength region from 400-3000 angstrom. Lifetime measurements have been made for a total of twenty-nine levels in I V, VI and VII, with cascade corrections being applied to the resonance transitions in I VI and VII. The multiplet oscillator strengths of 1.29 +/- 0.07 for the S-1-P-1 transition in I VI and 0.82 +/- 0.05 for the S-2-P-2 transition in I VII show a close agreement with isoelectronic trends for the Cd I and Ag I isoelectronic sequences. In the I V spectrum new energy level assignments are suggested for the 5s(2)6p2P and 5s5p2P-4 levels.