Which outcome occurs when ultraviolet light drives an organic molecule into an excited electronic state?

💡 Explanation

When UV light excites an organic molecule, absorption promotes an electron to a higher energy antibonding molecular orbital because of the Franck-Condon principle, increasing the vibrational mode amplitudes due to a change in equilibrium geometry. Therefore increased vibrations result, rather than decreased density, reduced ionization, or enhanced intersystem crossing which require different photophysical pathways.

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