Abstract
Molecular crystals exhibit a complicated range of behaviour following ultraviolet absorption. F1uorescence, chemical reaction, degradation into heat and excimer formation are all possible secondary processes. Which, if any, of these is dominant depends on the detailed nature of the conditions. Previous papers have dealt with trapping at chemical impurities and self-trapping [1], exciton-phonon coupling [2] and scattering and vibrational relaxation in relation to excimer formation [3]. The most characteristic feature of the excimer is that the equilibrium separation of the two molecules concerned is significantly different from their separation in the crystal and this causes difficulties in formulating a complete theory. Here attention is concentrated on a simple model of the incorporation of lattice distortion into the pure electronic exciton and the way in which this distortion can favour excimer formation.KeywordsLattice DistortionElectronic Excited StateVibrational RelaxationExciton BandExcimer FormationThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Published Version
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