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The important role of high-energy intramolecular vibrational modes for excitation energy transfer in the detuned photosynthetic systems is studied.Based on a basic dimer model which consists of two two-level systems (pigments)coupled to high-energy vibrational modes,we find that the high-energy intramolecular vibrational modes can enhance the energy transfer with new coherent transfer channels being opened when the phonon energy matches the detuning between the two pigments.As a result,the energy can be effectively transferred into the acceptor.The effective Hamiltonian is obtained to reveal the strong coherent energy exchange among the donor,the acceptor,and the high-energy intramolecular.A semi-classical explanation of the phonon-assisted mechanism is also shown.