Abstract
Abstract The 0-0 line of the So→Tl absorption in crystalline pyrene has been studied as the action spectrum of delyaed fluroescence in polarized light at 295 K, at 0.4 cm−1 resolution. The centroid for the b polarized line lies at an energy 2.8 ± 2 cm−1 higher than the one for the a polarized line. The polarization ratio is ϵb/ϵa = 1.1 ± 0.1. A discusstion of spin-orbit coupling proceses shows that in this case the the factor group (Davydov) splitting, is muchlarger than the envergy differnce of the centrolids, and hence also larger than the splitting resported before. The most probable value of the Davydov splitting is in the range 13 ± 9 cm−1.
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