Linear absorption as a tool to measure the exciton delocalization length in molecular assemblies

Abstract

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Statistics of Optical Spectra from Single-Ring Aggregates and Its Application to LH2

“…24 This length lies in the range of 6-9 molecules, depending on the value one accepts for the homogeneous line width of the exciton transitions. As we pointed out in ref 24, however, the existence of inter-ring disorder may give rise to an underestimation of the delocaliza-tion length through this method. The reason is that such disorder does not affect the delocalization length on a single ring, while it does broaden the ensemble-averaged absorption line.…”

Optical and Resonant Non-Linear Optical Properties of J-Aggregates of Pseudoisocyanine Derivatives in Thin Solid Films

“…A similar value of Jex is used in theoretical calculations. In particular, Jex ≈600 cm -1 is used to determine the exciton delocalization length (Bakalis & Knoester, 2000).…”

Energy harvesting: a review of the interplay between structure and mechanism

“…In light-harvesting complexes comprising large numbers of equivalent chromophores, excitons can spread over several equivalent donor/acceptor species and be associated with numerous, closely separated energy levels. Indeed, the separation between the lowest levels affords a useful means of gauging the extent of exciton delocalization [50]. Although any local disorder can substantially compromise the extent of such delocalization, and any superexchange coupling, one surprising finding has arisen in connection with the coupling between bacteriochlorophyll molecules.…”