Reactive scattering of O− in organic films at subionization collision energies

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Abstract
Anion desorption stimulated by the impact of 0–20 eV electrons on O 2 /hydrocarbon mixed films is reported. It is shown that part of the H − , OH − , CH − , and CH 2 − desorption yields from O 2 /hydrocarbon films is the result of reactive scattering of O − fragments produced via dissociativeelectron attachment (DEA) in the alkane and alkene thin films. These results support the interpretation that the DEA O − react with the hydrocarbon molecules to form a transient molecular anion complex which, in addition to autodetachment, may decay by dissociation into various anion and neutral fragments, and thus cause chemical modification of the solid.