@article{cdb952d4aef64e41ba31fba9e3fec2e7,
title = "Remarkable two-photon absorption in open-shell singlet systems",
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.",
author = "Masayoshi Nakano and Kyohei Yoneda and Ryohei Kishi and Hideaki Takahashi and Takashi Kubo and Kenji Kamada and Koji Ohta and Edith Botek and Ben{\`o}t Champagne",
note = "Funding Information: This work is supported by Grant-in-Aid for Scientific Research (Grant Nos. 21350011 and 20655003) from “Japan-Belgium Cooperative Program” from Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research on Priority Areas (Grant No. 18066010) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, and the global COE (center of excellence) program “Global Education and Research Center for Bio-Environmental Chemistry” of Osaka University. B.C. thanks the Belgian National Fund for Scientific Research for his research director position. E.B. thanks the Interuniversity Attraction Pole on “Supramolecular Chemistry and Supramolecular Catalysis” (IUAP No. P5-03) for her postdoctoral grant.",
year = "2009",
doi = "10.1063/1.3225202",
language = "English",
volume = "131",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics",
number = "11",
}