Berlin 2001 – scientific programme

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MO: Molekülphysik

MO 12: Posters Friday: Spectroscopy

MO 12.22: Poster

Friday, April 6, 2001, 12:30–15:00, AT3

VUV absorption and Electron Energy Loss Spectroscopy of Trifluoromethyl sulfur pentafluoride — •Paul Kendall and Nigel Mason — University College London, Department of Physics and Astronomy, Gower Street, London, WC1E 6BT, United Kingdom

Trifluoromethyl sulfur pentafluoride is a potentially important gas in global warming due to its large infrared absorbance. We have measured the absorption cross sections of trifluoromethyl sulfur pentafluoride (SF₅CF₃)for the first time in the range of 8 to 22 eV using Electron Energy Loss Spectroscopy (EELS) together with VUV photoabsorption data using the Daresbury synchrotron radiation source. The EELS spectrum of sulfur hexaluoride (SF₆) was also measured to allow comparison of the two compounds. Similarities are observed between the spectra of the two compounds with the two spectra showing similar peaks in the range between 11 and 15 eV . The photolysis of the compounds have been studied and found to lead to long lifetimes in the atmosphere.