The fluorescence excitation spectra of aromatic liquids and solutions

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Abstract
The fluorescence excitation spectra of liquid benzene, toluene, p-xylene, mesitylene, 2-methylnaphthalene, 1,6-dimethylnaphthalene, naphthalene, fluorobenzene and fluoronaphthalene, and of cyclohexane solutions of the first six compounds, were observed in deoxygenated systems at wavelengths not less than 195 nm. The observed dependence of the relative fluorescence yield on excitation wavelength and concentration is analysed in terms of a model kinetic scheme involving the formation of higher excimer states D** from the higher excited molecular states X**. Data are obtained on the relative efficiencies of internal conversion from X** and D** to the corresponding fluorescent states. The nature of the competing processes is discussed.

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