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Abstract
We report calculated two-photon (TPA) absorption spectra based upon results obtained from quadratic response time-dependent density functional theory for fluorene-based donor-π-acceptor molecules. Coulomb attenuated functionals with a long-range exchange contribution are applied to predict TPA excitation energies and cross-sections. Observed spectra are explained, and the effects of conjugation and multibranching on the TPA spectra are discussed.
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