Remarkable two-photon absorption in open-shell singlet systems.
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.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. mnaka@cheng.es.osaka-u.ac.jp
Masayoshi
M
Nakano
Kyohei
K
Yoneda
Ryohei
R
Kishi
Hideaki
H
Takahashi
Takashi
T
Kubo
Kenji
K
Kamada
Koji
K
Ohta
Edith
E
Botek
Benoît
B
Champagne