Adiabatic Expansions and Nonadiabatic Effects

摘要: Publisher Summary This chapter deals with the problems that arise in applying adiabatic expansion methods to theory of ion–atom collisions. It discusses a fully quantum mechanical approach, semiclassical impact parameter approach or indeed semiclassic, semiquantal phase integral approach. The commences Born–Oppenheimer states, although an alternative semimolecular choice basis set comprises continuum distorted wave atomic states. also addresses Galilean invariance either through reaction coordinates such as Eckhart hyperspherical electron translation factors (ETF). ETF may be classic nonclassic, state dependent independent, and electronic-coordinate independent. reviews phase-integral interpretative understanding nonadiabatic transitions effects, including Berry phase.