SUBSTRATE SENSITIVITY OF DISSOCIATIVE ELECTRON-ATTACHMENT TO PHYSISORBED ANILINE

We report dissociative electron attachment (DEA) D- yields, at electro n energies, E-o < 14 eV, from small quantities of aniline-d(7) physiso rbed on Pt or on films of O-2 or Kr. Compared to 5.5 monolayers (ML) o f pure aniline-d(7), the DEA signal from 0.6 ML of aniline-d(7) on Pt is shifted down in E-o; for 0.6 ML of aniline-d(7) on 5 ML of O-2 the DEA signal is quenched. In the latter case, we observe reactive scatte ring of O- in the hydrocarbon overlayer. For 0.2 ML of aniline-d(7) on 35 ML of Kr, we observe charge and energy transfer from negatively ch arged excitons, Kr(-), to co-adsorbed aniline-d(7). (C) 1997 Elsevier Science B.V.