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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.

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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.

Item Type: Journal Article
Copyright Holders: 2009 Elsevier B.V.
ISSN: 0301-0104
Keywords: Photoabsorption; C2Cl4; tetrachloroethylene; electronic excitation; vibrational excitation; Rydberg series; photolysis
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 18793
Depositing User: Colin Smith
Date Deposited: 04 Nov 2009 09:40
Last Modified: 26 Feb 2016 05:45
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