ABSTRACT
The major themes of quantum mechanics are the physical interpretations of interactions in bound systems and particle scatterings. Stability of atoms and molecules is necessary in order that materials in nature could have any given determined physical and chemical properties, according to which these materials are distinguished and identified. Standard scattering theory has originally been introduced in nuclear physics, where the interactions are of short range, so that in the asymptotic region, the aggregates can be considered as being fully free. The required behaviours of the total scattering state are determined by the very nature of the interactions between the widely separated aggregates in the asymptotic region of scattering. In the old literature a terminological difference has sometimes been made between the notions of scattering and collision.
