Resonance-Light-Scattering Study and Line-Shape Simulation of the J Band

Line-shape simulations and resonance-light-scattering experiments of the J band in aggregates of pseudoisocyanine are reported. It is concluded that the J band can be described as a disordered Frenkel-exciton band with states that are pseudolocalized on segments of the aggregate chain. The resonance-light-scattering experiments show that the homogeneous dephasing of the excitonic states is dominated by phonon scattering to thermally accessible band states and that excitonic dephasing occurs in the fast modulation limit