Vibronic coupling refers to the interaction between electronic states and vibrational states in a molecular system. This phenomenon is crucial for understanding various processes in molecular physics and chemistry, including spectroscopy, photochemistry, and energy transfer. In more detail, vibronic coupling arises when there is a significant overlap between electronic states that leads to the mixing of their corresponding vibrational states. This interaction can occur due to changes in the molecular geometry that happen when electrons transition between different energy levels.
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