Electronic state spectroscopy of C₂Cl₄

Eden, S.; Barc, B.; Mason, N. J.; Hoffmann, S. V.; Nunes, Y. and Limão-Vieira, P. (2009). Electronic state spectroscopy of C₂Cl₄. Chemical Physics, 365(3) pp. 150–157.

DOI: https://doi.org/10.1016/j.chemphys.2009.10.010

Abstract

The VUV spectrum of C₂Cl₄ is reported in the energy range 3.8-10.8 eV (325-115 nm). Several photoabsorption features are observed for the first time, including a very weak low-lying band which is provisionally attributed to a π → π* triplet transition. Recent ab initio calculations of the molecule’s electronic transitions [Arulmozhiraja et al. J. Chem. Phys. 129 (2008) 174506] provide the basis for the present assignments below 8.5 eV. An extended ndπ series is proposed to account for several higher-energy Rydberg bands. The identification of vibrational structure, dominated by symmetric C=C and CCl₂ stretching in excitations from the HOMO, largely agrees with previous spectroscopic studies. The present absolute photoabsorption cross sections cover a wider energy range than the previous measurements and are used to calculate UV photolysis lifetimes of this aeronomic molecule at altitudes between 20 and 50 km.

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