Field evaporation (FEV) is the electric-field-induced removal of an atom (usually a metal atom) from a surface site of its own lattice. The removal most commonly takes place from a protruding surface site on a pointed emitter. The electric field at such sites is locally high, and the protruding atom is said to be 'at high risk' of FEV. This paper presents a different view based on the Quantum physics about the theory of the field evaporation (FEV). Thermal activation and ion tunneling are described mathematically as parts of an integrated process of FEV. On the base of this model calculations are made and they are compared with precise experimental data.
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