Spin dynamics of the coherent triplet-doublet pairs of selectively reacting molecules in an external magnetic field

The influence of an external magnetic field on spin-selective suppression of triplet (T) electronic excited state by the spin doublet D is investigated. Analysis of the T-states population kinetic is conducted on the basis of the solution of the equation for the T-D-pair spin density matrix, taking into account the exchange, spin-spin and Zeeman interactions. The dependencies of the magnetic effect magnitude of the T-D-quenching of phosphorescence from characteristic frequencies parameters of the system and the rate constants of the reaction are investigated. For large values of the magnetic field induction (greater than 0.1 T) a positive effect in the radiation intensity (4 - 6