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Objective: The Born-Oppenheimer approximation is one of the corner stones of classic photochemistry and photophysics.
Other topics include molecules with torsional transitions of the exchange type, the meaning of the Born-Oppenheimer approximation, non-rigid molecular systems with continuous axial symmetry groups, algebraic models of the global description of the molecular spectrum, and the Zeeman and Stark effects.
The Born-Oppenheimer Approximation has been fundamental in calculations in molecular spectroscopy and molecular dynamics since the early days of quantum physics.
Nonadiabatic quantum dynamics is a method of choice to study these processes theoretically as the Born-Oppenheimer approximation fails in the regions where electronic and nuclear motions are coupled.