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The Franck-Condon principle

We review the Franck-Condon principle as it applies to electronic transitions. We discuss vibrational progressions and their UV-VIS appearance. Timestamps 0:00 Introduction to Potential Energy Diagrams 0:55 Vibrational Energy Levels in Ground and Excited States 1:17 Spacing between the Vibrational Levels 2:38 Wave Function Overlap and Transition Probability 3:05 Probability of a Transition - Franck-Condon Principle 3:45 Drawing the Vibrational Wave Functions in the Excited State 5:01 Classical Turning Points and Transition Probabilities 6:09 Applying the Franck-Condon Principle 6:41 Sketching the Electronic Spectrum 8:06 Vibronic Progression 9:00 Example: Benzene UV-Vis Spectrum