Polarized absorption and fluorescence spectra of crystalline pyrene

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Abstract
The study of polarized absorption spectra on the ab face of crystalline pyrene at 90K has been reported. Measurements on the a:b polarization ratio and vibrational analysis for the different absorption systems are presented. It has been found that the second absorption system could be analysed in terms of frequencies of totally symmetric vibrations, whereas many of the vibrations in the first absorption system could not be unambiguously assigned. The excimer fluorescence of crystalline pyrene has also been studied on the ab and bc' faces. From the analysis of the data it has been found that, while the major contribution to the excimer fluorescence is derived from the transition directed along the long axis of the monomer molecule, the contribution due to an out-of-plane polarized transition is not negligible.

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