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Autoionization as an Effective Decay Channel for Highly Excited States in Molecular Crystals

Using a time resolved magnetic modulated fluorescence technique a specific decay channel for highly excited singlet excitons (until 40 eV) has been discovered consisting of: autoionization in an excited electron-hole pair, slowing down of the "hot" electron of the pair by excitation of triplet excitons charge carrier geminate recombination retarded by transient complexes between Frenkel excitons and charges. The connection of this process with exciton fission in two triplet or two singlet excitons is mentioned.