Abstract
Field evaporation of positive and negative ions of Au adatoms from a Au(100) surface and Si adatoms from a T4 site above a Si(111) unreconstructed surface are investigated within the charge exchange model. The atomic potentials for gold were determined using the embedded atom method and a method due to H. Gollisch[Surf. Sci. 166,87(1986)]. For Si, the atomic potentials used were the empirical potential due to Tersoff[Phys. Rev. B 37,6991(1988)] and an environment dependent potential developed by Bolding and Andersen[Phys. Rev. B 41,10568(1990)]. In the FIM configuration, for both materials, the singly charged positive ion is predicted as the observed species; in the STM configuration, the doubly charged negative ion is the favored ion species since it requires the lowest evaporation field.
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