Berlin 2001 – scientific programme
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MO: Molekülphysik
MO 12: Posters Friday: Spectroscopy
MO 12.21: Poster
Friday, April 6, 2001, 12:30–15:00, AT3
UV/Optical and Electron Energy Loss Spectroscopy of Trifluoromethyl iodide — •Paul Kendall and Nigel Mason — University College London, Department of Physics and Astronomy, Gower Street, London, WC1E 6BT, United Kingdom
Trifluoromethyl iodide is a gas used for two purposes. Firstly it
is used as a fire extinguisher in applications where the
environmentally damaging halons were previously used. Secondly it
is used in the plasma etching of integrated circuits, a technique
that has rendered traditional wet chemical processes obsolete. We
have measured the absorption cross sections of trifluoromethyl
iodide (CF3I) in the range of 4 to 18 eV using Electron
Energy Loss Spectroscopy (EELS) together with UV photoabsorption
readings using a UV/Vis spectrometer. Comparison is made between
the electron impact and photoabsorption spectra. In addition, the
photolysis of the compound has been studied and found to lead to
short lifetimes in the atmosphere.