6807
We present two - dimensional Fourier transform optical spectroscopy measurements of two types of molecular J - aggregate thin films and show that temperature - dependent dynamical effects govern exciton delocalization at all temperatures , even in the presence of significant inhomogeneity .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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