Chemical Physics Letters, Vol.712, 165-170, 2018
Kinetic curves crossing effect. Manifestation of the effect in singlet fission in organic semiconductors
Recent experimental studies of magnetic field dependent kinetics of singlet fission (SF) processes in some organic semiconductors [i.e. splitting of excited singlet (S-1) state into a triplet exciton pair] have revealed the important specific feature of obtained kinetic curves, associated with decaying intensities I (t) of fluorescence from S-1-state. Kinetic curves, measured in different magnetic fields, are found to cross each other. We show that this kinetic curves crossing (KCC) effect is a general feature of geminate condensed phase reactions, resulting from simple characteristic properties of kinetic schemes of processes. Specific features of the KCC-effect are analyzed in detail with some models of SF-processes.