Characterization of electronic transitions in complex molecules

摘要: A summary is given of the types of conclusions which may be drawn from a study of the emission properties of complex molecules under optical excitation in suitable systems. The types of radiationless transitions in complex molecules are discussed, and a resultant spectroscopic criterion stated: The emitting level of a given multiplicity is the lowest excited level of that multiplicity. Intercombinations in complex molecules are described, and their importance is shown to arise from the high probability of the excitation of triplet states-a …