SEARCH Articles Figures Tables CD spectrum two-chromophore systems Chromophores two conjugated Design of Second-order Chromophores the Two-level Model Excitation Transfer between Two Chromophores New chromophores for two-photon fluorescence Spectral Dynamics of a Chromophore Coupled to one or many Two-Level Systems Two-chromophore system Two-photon absorbing chromophores Two-photon absorption chromophores Two-photon chromophores