Abstract
Abstract Triplet exciton absorption lines in pure anthracene and pyrene crystals are investigated at very high resolution using photoexcitation in the lower temperature (<90 K) regime. The profiles for the lower Davydov components (zero-phonon) are observed to be most sensitive to crystal quality. Linewidths as small as 0.02 cm−1 are observed for the lowest exciton of anthracene with the upper component about 50 times broader. The T-dependences of the linewidths for the Davydov components of anthracene are shown to be explicable in terms of combined linear and quadratic exciton-photon coupling. The T-dependence of the zero-phonon to phonon sideband intensity ratio for pyrene is well described by the linear exciton-photon interaction in which the exciton is taken to be localized.
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