Abstract
In the experiment on electron-stimulated positive-ion desorption, H +(NH 3) n ions are ejected intensively from NH 3 physisorbed on an Ar spacer layer, whereas fragmentation occurs preferentially for C 2H 6, C 2H 4, and C 2F 6 molecules. The ions are emitted efficiently via Coulombic fission of physisorbed ultrathin films of NH 3, C 2H 6, and C 2H 4, but dissociative ionization is responsible for the ion emission from the C 2F 6layer. Moreover, molecular reactions are induced explosively by the electronic excitation of physisorbed ultrathin films: solvated protons or deuterons of formamide, ethyl amine, and ethyl alcohol, respectively, are ejected from CO/NH 3, C 2H 6/NH 3, and C 2H 6/D 2O layers.
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