Remarkable two-photon absorption in open-shell singlet systems

Masayoshi Nakano, Kyohei Yoneda, Ryohei Kishi, Hideaki Takahashi, Takashi Kubo, Kenji Kamada, Koji Ohta, Edith Botek, Benoit Champagne

Research output: Contribution to journalArticlepeer-review

Abstract

Remarkable enhancement of two-photon absorption (TPA) peak is theoretically predicted in symmetric open-shell singlet diradical systems with intermediate diradical character as compared to closed-shell and pure diradical systems. It is revealed that the largest TPA peak intensities occur for open-shell singlet diradicals having a ferromagnetically coupled ground state and strongly depend on the ratio between damping factors of the excited states. This result confirms that open-shell singlet conjugated molecules with intermediate diradical characters have precedence over conventional closed-shell conjugated systems in resonant third-order nonlinear optical properties.

Original languageEnglish
Article number114316
JournalThe journal of chemical physics
Volume131
Issue number11
DOIs
Publication statusPublished - 1 Dec 2009

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