Ion emission from an electronically perturbed solid surface: A general formulation

Summary. The theoretical problem of sputtered particles from an electronically excited metal substrate is established by using a generalized Anderson-Newns Hamiltonian in which surface excitations are explicitly taken into account through a one-body local time-dependent potential. Equations of motion for electron operators are analytically solved in terms of retarded Feynman diagrams and a formal solution for the final occupancy of the atomic orbital involved in the process is shown. Focus on the influence of substrate effects on the evolution of the localized state is made by analyzing changes in the self-energy diagrams, related to the virtual broadening of the state itself and the solid-atom transition amplitude form previous theoretical works. An approximated manageable formulation based on the slow dynamics of the problem is presented in terms of instantaneous graphs. Explicit calculations of the ionized fraction R+ are obtained under resonance condition of the atomic ele...