Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In theoretical chemistry, the vibronic coupling terms, (which are neglected within the Born–Oppenheimer approximation), are proportional to the interaction between electronic and nuclear motions of molecules. The term "vibronic" originates from the concatenation of the terms "vibrational" and "electronic". The word coupling denotes the idea that in a molecule, vibrational and electronic interactions are interrelated and influence each other.

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