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- W2951281867 abstract "The dispersion of the modulus of the third‐order nonlinear susceptibility, ‖χ(3)zzzz(−3ω;ω,ω,ω)‖, of an all‐trans β‐carotene doped polystyrene thin film has been measured by third‐harmonic generation throughout the 1 1Bu absorption band of the β‐carotene. The observed dispersion is interpreted in terms of a three‐electronic state model including explicit regard to six Franck–Condon active normal modes in the resonant electronic state. Both the sum‐over‐states method and, equivalently, the time domain approach are used. A fit of the three‐state model to the data shows that the large nonlinear susceptibility of β‐carotene in this wavelength range can be explained by strong dipole coupling between the strong one‐photon allowed 1 1Bu state and a nearby two‐photon allowed n 1Ag state. The electric dipole transition moment between the 1 1Bu excited state and the n 1Ag excited state, located at 22 200 cm−1, was determined to be 31 D." @default.
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- W2951281867 date "2010-08-22" @default.
- W2951281867 modified "2023-09-27" @default.
- W2951281867 title "ChemInform Abstract: Resonant Third-Harmonic Generation in all-trans β-Carotene: The Vibronic Origins of the Third-Order Nonlinear Susceptibility in the Visible Region." @default.
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- W2951281867 doi "https://doi.org/10.1002/chin.199207041" @default.
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