Experimental Evidence of Direct Exchange Interaction Mediating Intramolecular Singlet Fission in Weakly-Coupled Dimers

Oskar Kefer, Pavel V. Kolesnichenko, Lukas Ahrens +3

The electronic interaction between an optically active singlet state ($S_1{S}_0$) and a dark state of singlet multiplicity, known as correlated triplet pair (${}^1[TT]$), plays a cruci…