Non-Adiabatic Curve Crossings in Dissociative Electron Attachment of Condensed O2
Previously published data on electron stimulated desorption (ESD) from condensed O2 or O2 in solid matrices have been analyzed. Dissociative electron attachment (DEA) via the 2Σg + resonant state can result in two different dissociation products (i.e. by proceeding to the dissociation limits O(3P) + O−(2P) and O*(1]D) + O−(2p)). The O*(1D) product requires dissociation via a non-adiabatic curve crossing. O* (1D) is the dominant DEA product in gaseous O2. Upon condensation, O(3P) becomes the dominant product; however, the branching ratio depends strongly on the kinetic energy of the dissociating atoms.
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