SPECTROSCOPIC EVIDENCE FOR HYDRATED IODINE ATOMS
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Date
1970
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Ohio State University
Abstract
Using a classical flush spectroscopic apparatus delivering about 1500 J with a 5 $\mu s$ duration at half intensity and only 5% of the maximum intensity still present after 20 $\mu s$ we have examined iodine and triodide ions in aqueous solutions. With very pure iodine solutions, we have noted a transient absorption presenting two maxima, one at 375 nm and the other at 390 nm, which we assigned to $I_{aq}$. No absorption appears in the infrared up to 900 nm. When flashing triodide solutions a transient species is observed which absorbs in the near U.V. with a maximum at 340 nm and in the infrared with maxima at 700 and 800 nm. This species is already known as the $I_{2}^{-}$ion. Recombination kinetics, extinction coefficient, temperature effects and quantum yield of cage escape will be discussed.
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Author Institution: Laboratoire de Chimic Physique, Facult\'{e} des Sciences de Bordeaux