Reinvestigation of the UV-VIS absorption spectra of the interhalogens, Ibr and Icl

Abstract

<p>Absorption coefficients of ICI and IBr are of interest, in part because they are photolyzed to produce spin-orbit excited (2PX) CI* and Br* atoms in energy transfer studies. Notable differences currently exist for the vapor phase ICI absorption coefficients previously reported in scientific literature, and possibly correspond to sample purity. Additionally, only a single gas phase investigation of IBr absorption coefficients has been published. In the present work, great care was used in the preparation of ICI and IBr from stoichiometric amounts of the elemental halogens. Extinction coefficients for halogen (C12 and Br2) and interhalogen (lCI and IBr) vapors were determined in the 200 nm - 600 nm spectral range using a diode array spectrophotometer. Results for the elemental halogens are in excellent agreement with current recommendations. Results for the interhalogens will be compared to currently recommended values.</p><p>This presentation occurred at the Wright State University Campus-Wide Celebration of Research, Scholarship and Creative Activities on April 16, 2010</p>