RADIATIVE AND NONRADIATIVE LIFETIMES OF THE TRIPLET STATE OF $SO_{2}$ GAS
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Date
1971
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The lifetime of the $^{3}B_{1}$ state of $SO_{2}$ has been measured as a function of pressure and extrapolated to zero pressure. The results are in fair agreement with those of Collier et $al.^{1}$ For comparison, the radiative lifetime has been calculated from the absorption and emission spectra using the formula of Strickler and $Berg.^{2}$ The absorption spectrum was measured using a Cary Model 17 spectrophotometer. Integration of the absorption intensity over the whole band is not possible because it is superimposed on another transition. For this reason, Franck-Condon factors were calculated for the vibronic bands which could be assigned. The integrated intensity of these bands was measured, and the Franck-Condon factors used to extrapolate the intensity over the entire electronic transition. Comparison of the calculated and observed lifetimes indicates that only 2\% of the molecules reaching the triplet state emit; the rest undergo some nonradiative process.
Description
$^{1}$S. S. Collier, A. Morikawa, D. H. Slater, J. G. Calvert, G. Reinhardt, and E. Damon, J. Amer. Chem. Soc. 92, 217 (1970). $^{2}$S. J. Strickler and R. A. Berg, J. Chem. Phys. 37, 814 (1962).""
Author Institution: Department of Chemistry, University of Colorado
Author Institution: Department of Chemistry, University of Colorado