Computer simulation of the kinetics of radiation-induced delayed fluorescence in nonpolar solutions

Abstract

The processes of the formation of excited states on the nanosecond timescale in irradiated alkane solutions of positive charge and energy acceptors were studied by means of computer simulation in the single-spur approximation as an the example. The model involved pairwise contact interactions between all transient species produced in the same spur with allowance for their spin state. The effects of external magnetic and electric fields on the kinetics of delayed fluorescence were calculated, depending on the spur size and the initial number of ion pairs in the spur. It was shown that energy transfer from excited solvent molecules to an acceptor and the annihilation of luminophore triplet molecules should be taken into consideration in the simulation of the kinetics of delayed fluorescence of irradiated solution even at a low average ionization density.