Abstract
The polarization fluorescence spectra of isopropanol-water mixture excited by ultraviolet light was studied experimentally.The decay process of fluorescence intensity was detected at different center emission peaks.The curve was fitted by an exponential function and the processing data was obtained by deconvolution.Both the polarization degree and fluorescence lifetime were calculated,and mathematical characterization was performed for the fluorescence counts decay curves.The fluorescence emission and polarization characteristics were discussed.It is found that the isopropanol-water mixture excited by ultraviolet light obtains partially polarized fluorescence with certain molecular orientation.The polarization degree and anisotropy degree are 0.542 and 0.441,respectively.Induced by exciting light with wavelengths of 220 nm and 232 nm,the fluorescence lifetime of isopropanol-water mixture at peaks of 277,284,293,309 nm is about 17 ns.While the average fluorescence lifetime at peaks of 328 nm,345 nm and 362 nm is around 21,22,16 ns,respectively.It is related with the molecular cluster structure relative stability of isopropanol-water mixture by the action of hydrogen bond.The research will contribute to the study of the molecular characteristic of isopropanol-water cluster.
Published Version
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