High Quality Content by WIKIPEDIA articles! In classical mechanics (CM), at the molecular level, one can define a potential energy surface. This is a purely classical construct and does not hold for QM. In QM an adiabatic state (i.e. not resonant with other states) will remain occupied. For example in a diatomic, the classical interpretation of the stretch mode is a periodic vibration. Here CM agrees with QM and the system is perfectly adiabatic (all the energy remains in the vib mode).

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