Triplet states in radiolysis of solid solutions

Results of studies carried out in this laboratory on radiolytic formation and deactivation of solute excited triplet states in rigid organic solutions are reviewed. Energy transport from matrix to solute molecles was shown to occur in these systems. In matrices formed by aromatic molecules (toluene, polystyrene) this energy transport is realized via processes of singlet-singlet and triplet-triplet transfer of excitation energy. Three processes of triplet quenching have been found and discussed: (i) transfer of electronic excitation energy to solvent radicals, (ii) annihilation of solvent molecular excitations upon interaction with solute triplet molecules and (iii) specific deactivation of solute triplet molecules by solvent radiation products. (author)