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Four basic processes are envisioned, among them migration (diffusion), localrotation (reorientation), isothermic chemical reactions and nucleation. All ofthem are unified by a common approach to the barrier currents that has beensuggested as far back as 1961 by John Bardeen and then extended by StefanChristov some ten years later. By introducing the respective radial potentials,we incorporate Schroedinger's equation and thereby a quantum insight into thephenomena. Numerical calculations of the obtained statistical transition ratesare reported.

Mode-coupled barrier-controlled atomic processes in solids: a comparative study