Charge trapping and the desorption of anionic and metastable fragments by dissociative electron attachment to condensed

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Abstract
We have studied dissociative electron attachment (DEA) to condensed by measuring the charge trapping (CT) cross section for submonolayer quantities of on Kr, and by monitoring the electron-stimulated desorption (ESD) of and metastable from and doped Kr and films. Several new channels for DEA are revealed. The largest CT cross section, of approximately , is observed over the incident energy range 0.15 - 1.5 eV and is attributed to DEA, although the possibility that is also stabilized at the lowest energies cannot be excluded. The magnitude of the CT cross section represents an enhancement of more than a factor of 35 relative to the peak gas phase DEA cross section at 2.3 eV. This increase can be attributed to the interaction of the anion state with its polarizable environment. Additional anion states, at , , and possibly , contribute to the DEA yield of . Of these, the 9 and 15.9 eV resonances have no experimentally observed analogues in the gas phase. The charge and energy transfer between the 9.0 eV feature and the state of multilayer Kr films indicates a Rydberg character for this state.