Absorption of an Exciton and Exciton propagation

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Main Question or Discussion Point

I read articles talk about the absorption of the exciton in a solvent, such as TIPS Pentracene in toluene. My question is does the absorption spectrum keep the same for aggregate TIPS Pentracene , in case if I want to know for a layer of TIPS Pentracene?!

My second question is: let's say I know absorption spectrum of Exciton, such as TIPS Pentracene, and I excite it with wavelength between two maxima in the absorption spectrum (not necessary that is minimum but a region between two maxima)... does then exciton propagation occurs?
 

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