丙酮-水溶液的荧光光谱发射特性研究

对丙酮-水溶液在紫外光激励下产生的荧光光谱和不同检偏角下的偏振光谱进行了实验研究,分析和讨论了其荧光产生机理和谱线特性,并计算了其偏振度和各向异性度。结果表明,丙酮-水溶液在波长为303nm左右的紫外光激励下能产生较强的荧光,其主要荧光峰位于395nm左右,荧光的发射类型为π＊→n;随着浓度的增加395 nm处的荧光强度线性增强,当增至8%后发生浓度猝灭;丙酮-水溶液发射出的荧光为部分偏振光,具有确定的分子取向,偏振度和各向异性度分别为0.343和0.510。研究结果可为丙酮-水溶液的物理化学性质及团簇结构的研究提供参考。

Study on the fluorescence spectra characteristic of acetone-water solution

The fluorescence spectra and polarization spectra in different probing angle of acetone-water solution excited by Ultraviolet light were studied experimentally.The emission mechanism and spectral characteristics ave discussed;the polarization degree and the anisotropy degree were calculated.The results show that the acetone-water solution emits an obvious fluorescence peak nearby 395 nm with the optimal excitation wavelength of 303 nm.The fluorescence emission type is πn.With increasing the concentration,the fluorescence intensity at 395 nm strengthens linearly,and concentration quenching occurs after the concentration 8%.The fluorescence of acetone-water solution is partially polarized light and the molecules have determined orientation.The polarization degree is 0.343 and the anisotropy degree is 0.51.The research can contribute to the study of acetone-water cluster structures and the physical and chemical characteristics.