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• W2321766421 abstract "We report resonance Raman spectra of individual porphyrin nanotubular aggregates of meso-tetra(4-sulfonatophenyl)porphyrin (TSPP) deposited on glass. Using a novel internal/external standard method, we show that absolute Raman cross sections of low-frequency vibrational modes are greatly enhanced by J-band excitation. We report single-aggregate resonance Raman spectra obtained without surface enhancement. Variations in the relative intensities of low- and high-frequency Raman modes of different aggregates and images of the resonance light scattering in epi-illumination reveal variations in aggregate structure and allow the possible correlation between Raman intensity and coherence to be explored. Polarized Raman spectra of individual aggregates confirm that the J-band is a composite of two closely spaced vibronically coupled transitions polarized parallel and perpendicular to the long axis of the aggregate, in accordance with our structural model of a hierarchical helical nanotube. The evolution of the Raman spectrum of a single aggregate during laser heating reveals the role of water in the assembly of structural subunits. Our experimental results provide insight into the concept of aggregation-enhanced Raman scattering." @default.
• W2321766421 created "2016-06-24" @default.
• W2321766421 creator A5047042150 @default.
• W2321766421 creator A5069229387 @default.
• W2321766421 date "2013-05-13" @default.
• W2321766421 modified "2023-09-23" @default.
• W2321766421 title "Resonance Raman Spectra of Individual Excitonically Coupled Chromophore Aggregates" @default.
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• W2321766421 doi "https://doi.org/10.1021/jp404109u" @default.
• W2321766421 hasPublicationYear "2013" @default.
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