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Berlin 2001 – scientific programme

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MO: Molekülphysik

MO 12: Posters Friday: Spectroscopy

MO 12.20: Poster

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

Electron Energy Loss Spectroscopy of Dinitrogen pentoxide — •Paul Kendall1, Nigel Mason1, George Marston2, Gareth Buchanan2, and Jean-Luc Le Garrec31University College London, Department of Physics and Astronomy, Gower Street, London, WC1E 6BT, United Kingdom — 2University of Reading, Department of Chemistry, Whiteknights, PO Box 224 Reading, RG6 6AD, United Kingdom — 3Univ Rennes 1, CNRS, UMR 6627, Campus Beaulieu, F-35042 Rennes, France

Dinitrogen pentoxide is an important stratospheric reservoir of the NOx family of gases that play a key role in stratospheric ozone depletion. In the troposphere it is linked to the processes that create and destroy the NO3 radical and is involved in the transportation of NOx from colder to warmer regions of the atmosphere. We have measured the absorption cross sections of dinitrogen pentoxide (N2O5) in the range of 5 to 19 eV using Electron Energy Loss Spectroscopy (EELS). We contrasted the data obtained with a vacuum ultraviolet study in the range of 140 to 240 nm ( 5 to 9 eV). In this range the two data sets were in good agreement. Above 9 eV, we observed a strong peak at  9.7 eV and smaller scale structure between 11 and 13 eV. Little structure was observed at the higher energy losses studied.

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