TY - BOOK AU - Nakano,Masayoshi ED - SpringerLink (Online service) TI - Excitation Energies and Properties of Open-Shell Singlet Molecules: Applications to a New Class of Molecules for Nonlinear Optics and Singlet Fission T2 - SpringerBriefs in Molecular Science, SN - 9783319081205 AV - QD450-882 U1 - 541 23 PY - 2014/// CY - Cham PB - Springer International Publishing, Imprint: Springer KW - chemistry KW - Chemistry, Physical organic KW - Optical materials KW - Chemistry KW - Physical Chemistry KW - Optical and Electronic Materials KW - Atomic, Molecular, Optical and Plasma Physics N1 - Introduction -- Electronic Structures of Symmetric Diradical Systems -- Electronic Structures of Asymmetric Diradical Systems -- Diradical Character View of (Non)linear Optical Properties -- Diradical Character View of Singlet Fission -- Summary N2 - This brief investigates the diradical character, which is one of the ground-state chemical indices for "bond weakness" or "electron correlation" and which allows researchers to explore the origins of the electron-correlation-driven physico-chemical phenomena concerned with electronic, optical and magnetic properties as well as to control them in the broad fields of physics and chemistry. It then provides the theoretical fundamentals of ground and excited electronic structures of symmetric and asymmetric open-shell molecular systems by using model molecular systems. Moreover, it presents the theoretical design guidelines for a new class of open-shell singlet molecular systems for nonlinear optics (NLO) and singlet fission UR - http://dx.doi.org/10.1007/978-3-319-08120-5 ER -