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Fig. 3. DFT calculations and the RASI mechanism. (A) Optimized geometries of CMA1 in S0, S1 and T1 states.  (C) Schematic of the RASI mechanism based on TD-DFT calculations, illustrating the stabilization of S1 and destabilization of T1 as the dihedral angle between donor and acceptor increases from co-planar (P) to rotated (R) geometries. Oscillator strength for the S1 to the ground state varies approximately sinusoidally with dihedral angle. S1-T1 degeneracy occurs at angle ¦È0. Trajectories for photogenerated singlets (dot) and electricallygenerated triplets (dash) are indicated.

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