Berlin 2001 – wissenschaftliches Programm
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MO: Molekülphysik
MO 12: Posters Friday: Spectroscopy
MO 12.15: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
Anion Formation in the Low-Energy Electron Impact to Dichlorine Monoxide Dichlorine Monoxide — •Petra Tegeder1, Wolfgang Sailer2, Herwig Drexel2, Martina Meinke3, Eckart Rühl3, Tilmann D. Märk2, Nigel J. Mason1, and Eugen Illenberger3 — 1University College London, Department of Physics and Astronomy, Gower Street, London WC1 6BT, UK — 2Leopold Franzens Universität Innsbruck, Institut für Ionenphysik, Techniker Strasse 25, A-6020 Innsbruck, Austria — 3Freie Universität Berlin, Institut für Chemie-Physikalische und Theoretiche Chemie, Takustrasse 3, D-14195 Berlin, Germany
The oxides of chlorine have raised a broad interest in the recent years
due to the involvement of these molecules in the chemical
transformations that lead to depletion of ozone in the Earth’s
stratosphere. Dichlorine monoxide Cl2O is thought to play
only a minor role in the stratospheric chemistry; however, it is widely
used as a laboratory source of
ClO, a radical that is central to the catalytic loss of
stratospheric ozone.
We have studied negative ion formation following low-energy (0–10
eV) electron impact to gas phase Cl2O molecules.
The dominant feature is formation of the transient negative ion
(ClOCl−*) by resonant electron capture in the vicinity of 0 eV
which decomposes into ClO−, Cl−, Cl2− and
O−.
Also observed at higher target pressure is the parent anion
ClO2− which arises from an effective charge transfer
process involving a metastable complex formed in the collision
between the dissociative electron attachment products Cl2−
or ClO− and the sample molecule ClOCl.