Thermoreflectance spectra are measured for the vibronic bands of the lowest singlet exciton in anthracene at 10 K. Spectral features due to the 0–0 excitons, vibrons and the multi-particle band edges are interpreted in terms of a classical oscillator model. The characteristic profile of the two-particle absorption band associated with the 390 cm -1 intramolecular vibration is compared with a model calculation by the dynamical coherent potential approximation model. It is concluded that the density of states curve for the exciton has a strong one-dimensional character near the lower band edge, but at higher energies it is of three-dimensional character having a large density of states near the upper edge.
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Tokura et al. (1982) studied this question.
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