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The photoisomerization channel mapped on S1. (A) CASPT2 corrected S0, S1, and S2 energy profiles (molecular parameters are reported in Å and degrees). (B) Corresponding evolution of the fractional positive (Mulliken) charge resident on the right chromophore moiety and ionic character (ionicity %). (Inset) See dotted line: Ionic/covalent states are characterized by a positive charge that stays preferentially on the left/right moiety.
