Linear optical properties of perylene-based chromophores

In the present work, the deformations of the relaxed excited states of several perylene derivatives are related to the elongations of internal molecular vibrations and to the linear optical response of a single molecule. Different experimental techniques revealing these elongations are compared, including linear absorption, photoluminescence, photoluminescence excitation spectra, laser induced fluorescence, resonant Raman, and pump-probe spectroscopy with femtosecond laser pulses. The absorption spectra obtained for dissolved or matrix-isolated monomers reveal a dependence of the internal dynamics of the monomers on the dielectric properties of the surroundings. Two theoretical approaches for the determination of the vibronic coupling constants are compared with previous calculations.