LASER-EXCITED, NARROW-LINE FLUORESCENCE OF ORGANIC COMPOUNDS IN LOW TEMPERATURE FROZEN SOLUTIONS

Author Institution: Eastman Kodak Company, Research Laboratories, Rochester; University of Rochester, Rochester, New YorkUsing narrow bandwidth (< $0.2 cm^{-1}$) laser excitation, narrow-line fluorescence spectra are found for several organic compounds in low temperature (4.2$^{\circ} K$) glasses which normally exhibit broadbanded emission spectra. Excitation in the 0-0 band of a compound produces the simplest spectrum; otherwise, an increased number of broader lines is observed, Substituents can greatly affect the bandwidths, and polar solvents also affect the band-widths of molecules whose dipole moments change upon excitation. Comparison of the narrow-line and broadbanded spectra allows direct determination of the inhomogeneous broadening bandwidths