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A computer file searching procedure for fluorescence spectra has been developed. The procedure is based on comparisons of the most obvious spectral features in fluorescence excitation and emission spectra. These spectral features include the total number of peaks, peak locations, widths at half height, relative intensities, and the location of an excitation minimum. The library file used in the file searching procedure was developed from the first 1000 compounds characterized in Sadtler's Standard Fluorescence Spectra. Abbreviated representations for each substance were packed into 16-bit computer words. The file searching and the acquisition of experimental fluorescence spectra were both done by a minicomputer. The file searching algorithm was evaluated. The results show that the procedure is capable of either identifying an unknown compound or suggesting structural analogues.