Spectral diffusion of single molecule fluorescence: A probe of low-frequency localized excitations in disordered crystals

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Abstract
Spectral diffusion of the transition frequency of single pentacene molecules in p-terphenyl crystal was recently observed experimentally. In this Letter we propose a microscopic theoretical model to explain this phenomenon. Analysis of the experimental data with our model yields detailed microscopic information about the nature and spatial distribution of the localized excitations responsible for the observed spectral diffusion.