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Phosphorescence spectra of naphthalene, a-methylnaphthalene, a-chlornaphthalene and diphenyl can be excited by light absorbed by benzaldehyde, benzophenone, acetophenone, ethyl phenyl ketone, o-hydroxybenzaldehyde, benzoin, diphenylamine and carbazole, both components being dissolved in ethanol + ether at -195" C. Measurements of the intensities and decay times of the emission spectra as a function of the concentrations definitely prove that an energy transfer between triplet states is taking place.

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