The fluorescence spectra of polystyrene solutions have been measured in various solvents. The ratio of the intensity ID of the excimer (short living excited dimer) band to the intensity IM of the monomer band depends on the solvent. The values extrapolated to diluted solutions may be related to the average density of segments in a polymer molecule. Above concentrations of 0.1 g/100 ml, the ratio ID/IM increases with increasing concentration, and the peak position of the excimer band shifts to a longer wavelength.
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NISHIHARA et al. (1969) studied this question.
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