Nonlinear cubic susceptibility and dephasing of exciton transitions in molecular aggregates
Bogdanov V.L., Viktorova E.N., Kulya S.V., Spiro A. S.
The magnitude and dispersion of the nonlinear cubic susceptibility χ{ ' have been measured for an exciton transition of J aggregates of pseudoisocyanine in liquid solutions. There is a pronounced increase 'ιηχ{3) during the aggregation of the molecules. The dephasing time of the exciton transition, the absorption cross section, and the concentration and size of the "optical" aggregates have been determined.
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![](/ps/1147/article_17365_800_head.png "The magnitude and dispersion of the nonlinear cubic susceptibility <b><i>χ<sup>{</sup> ' </i></b>have been measured for an exciton transition of <b><i>J </i></b>aggregates of pseudoisocyanine in liquid solutions. There is a pronounced increase <b><i>'ιηχ<sup>{3)</sup> </i></b>during the aggregation of the molecules. The dephasing time of the exciton transition, the absorption cross section, and the concentration and size of the "optical" aggregates have been determined.")