Fluorescence spectrum characteristics of ethanol-water clusters

The fluorescence spectra of the ethanol - water mixture excited by ultraviolet light and the excitation spectra corresponding to the fluorescence peaks are investigated respectively. It is found that the mixtures emit fluorescence photons, which is different from pure ethanol and water. One can conclude that new molecule clusters are created by mixing of the ethanol and water molecules. The incident light of different wavelengths irradiates the solution and the fluorescence quantum yield at each wavelength is calculated firstly, and then the excited light with the maximum quantum yield is selected to irradiate the mixture. By the experimental results of fluorescence spectra of solution with different concentrations, the possible structures of these new molecule clusters are discussed. The general absorptivity and fluorescence counts are calculated basing on the additive property of absorptivity and fluorescence intensity, elucidating the fluorescence spectra characteristic of ethanol - water mixture. The research may contribute to the study of the new molecule clusters of ethanol-water.