title: A new analysis of molecular orbital wave functions based on resonance theory.
abstract: A new method to evaluate the weights of resonance structures from molecular orbital wave function is proposed, which is based on the second quantization of singlet-coupling. The present method is useful to analyze molecules of which the electronic structures are well localizable. The evaluation is carried out through localization of molecular orbitals followed by algebraic calculation of density matrices. This method is applied to H(2)O, H(3)O(+), and BH(3). The calculated weights of covalent and ionic structures are in excellent agreement with those of the previous works and our chemical intuition.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ikeda
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Nakao
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Sato
authors.forename: Shigeyoshi
authors.initials: S
authors.lastname: Sakaki