Abstract
The optical dynamics of pentacene in polymethylmethacrylate and polystyrene have been reinvestigated using the accumulated photon echo method. An earlier noted discrepancy between the results obtained by this technique and those obtained by hole burning on one of these systems is resolved and shown to be due to heating of the sample. The new temperature-corrected dephasing data do not follow a temperature power law, but fit well to a model that assumes coupling of the optical dipole to a librational degree of freedom and to the two-level systems of the glass. The photon echo and hole burning data are also used to estimate the effect of spectral diffusion on the results obtained in these experiments.
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