Theory of excitation energy transfer regarded as nonadiabatic transition 2: Calculational evidence of nonadiabatic interaction causing intermolecular excitation energy transfer

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<jats:title>Abstract</jats:title><jats:p>To clarify whether the excitation energy transfer from a donor molecule or aggregate to a remote acceptor molecule or aggregate can be caused by nonadiabatic interaction as expected in our previous studies <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#bib4">Okuno, Y. Chem Phys Lett 2001, 347, 138–142</jats:ext-link>; <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#bib5">Okuno, Y.; Mashiko, S. Int J Quantum Chem 2002, 90, 772–777</jats:ext-link>, we carried out <jats:italic>ab initio</jats:italic> calculations for three donor–acceptor systems. Even when the acceptor is separated from the donor by 15 Å, it was found that nonadiabatic coupling elements have moderately large values in the nuclear configuration region where the potential energy surfaces at two excited states for the donor–acceptor system are close to each other; otherwise, the conical intersection between the two excited‐state potential energy surfaces appears. In addition, it was found that the adiabatic approximation for the donor–acceptor system holds in the nuclear configuration region in which the initial and final wave packets in the process of the excitation energy transfer lie. These findings lead to the conclusion that the excitation energy transfer between two remote molecules or aggregates can be caused by the nonadiabatic interaction. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem 94: 36–43, 2003</jats:p>

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