REACTIVE SCATTERING OF O- IN ORGANIC FILMS AT SUBIONIZATION COLLISIONENERGIES

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- desorption yields from O-2/hydrocarbon films is the result of reactive scattering of O- fragments produced via dissociativ e electron attachment (DEA) in the alkane and alkene thin films. These results support the interpretation that the DEA O- react with the hyd rocarbon 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 t he solid. (C) 1998 American Institute of Physics. [S0021-9606(98)70443 -X].