Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 45, Pages 12051-12054Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201403859
Keywords
conical intersections; dissociative electron attachment; plasma chemistry; trifluoroiodomethane; velocity slice imaging
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Funding
- Eimskip University Fund
- COST action [CM0601]
- Icelandic Center for Research (RANNIS)
- Marie Curie Fellowship
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In light of its substantially more environmentally friendly nature, CF3I is currently being considered as a replacement for the highly potent global-warming gas CF4, which is used extensively in plasma processing. In this context, we have studied the electron-driven dissociation of CF3I to form CF3- and I, and we compare this process to the corresponding photolysis channel. By using the velocity slice imaging (VSI) technique we can visualize the complete dynamics of this process and show that electron-driven dissociation proceeds from the same initial parent state as the corresponding photolysis process. However, in contrast to photolysis, which leads nearly exclusively to the P-2(1/2) excited state of iodine, electron-induced dissociation leads predominantly to the P-2(3/2) ground state. We believe that the changed spin state of the negative ion allows an adiabatic dissociation through a conical intersection, whereas this path is efficiently repressed by a required spin flip in the photolysis process.
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