The excitation and emission spectra of isopropanol-water complex are studied experimentally,and the fluorescence emission mechanism is analyzed.The fluorescence spectra of isopropanol-water complex with different volume percentages excited by ultraviolet light with wavelengths of 220 nm and 232 nm are obtained,which are optimized by derivative fluorescence spectrometry based on the method of FFT low-pass filtering and smoothing,and the molecular cluster characteristics of isopropanol-water complex are inves...