Abstract
The use of Born–Oppenheimer product wave functions to describe the vibronic states of an excited dimer is tested. Comparison of the results with those obtained with Merrifield's exact numerical treatment of the vibronic equations for a simple model leads to the conclusion that this is a valid approach except: (a) in certain cases of very weak coupling; (b) when there is a near degeneracy of the Born–Oppenheimer vibronic states. In this way, by application of the non-crossing rule to vibronic levels of the same parity, the zigzags occurring in Merrifield's correlation diagrams are explained.
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