Spectroscopic constants and vibrational assignment for the B 30u+ state of iodine

J. I. Steinteld, R. N. Zare, L. Jones, M. Lesk, W. Klemperer

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Portions of the iodine B 30u+←X 1g+ absorption spectrum have been remeasured under high resolution. A new analysis of 719 lines in the 3-6, 4-7, 5-4, 7-5, 11-1, 12-2, 13-2, 25-0, and 29-0 bands, combined with previous measurements by Mecke, Loomis, and Brown, gives the following revised constants: ω e′=125.273 cm-1 Te′=15770.59 γe′=-4.0×10-7 ωex e′ = 0.7016 Be′ = 0.028969 δe′=-3.5×10-8 ωey e′=-0.00567 re′ = 3.0276 Å D e′ = 3.5×10-9 weZ e′ = +0.000032 αe′ = 0.0001562 βe′ = 3.9×10-10 De′ = 4391.0 Constants for ground state rotational levels were found to be in good agreement with Rank's latest determinations. Using these new constants for the B state, Franck-Condon factors for this system were computed. The vibrational numbering originally assigned by Mecke and Loomis to the B state was decreased by one unit to bring calculated intensity distribution into complete agreement with all observed fluorescence data, including new photoelectric measurements on a number of bands. No systematic variation of the electronic transition moment could be derived from these data. These revised Franck-Condon factors were also used to recalculate radiative lifetimes from absolute absorption data which are in fair agreement with the phase-shift determination of Brewer, Berg, and Rosenblatt.

Original languageEnglish (US)
Pages (from-to)25-33
Number of pages9
JournalThe Journal of Chemical Physics
Issue number1
StatePublished - 1965

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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