Abstract
Singlet—triplet absorption spectra of anthracene single crystals have been investigated between 2 K and 300 K using high resolution photoexcitation spectroscopy with a tunable cw dye laser. Up to 100 K the 0, 0 Davydov components are broadened symmetrically to about 7 cm−1. At higher temperatures the line shape is dominated increasingly by Stokes and anti-Stokes phonon sideband contributions. Both 0, 0 components are shifted to higher energies with increasing temperature but in different amounts. This is explained as a superposition of a decrease both of the Davydov splitting and of the solvent shift.
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