title: Topology of conical/surface intersections among five low-lying electronic states of CO2: multireference configuration interaction calculations.
abstract: Multi-reference configuration interaction with single and double excitation method has been utilized to calculate the potential energy surfaces of the five low-lying electronic states (1)A1, (1)A2, (3)A2, (1)B2, and (3)B2 of carbon dioxide molecule. Topology of intersections among these five states has been fully analyzed and is associated with double-well potential energy structure for every electronic state. The analytical potential energy surfaces based on the reproducing kernel Hilbert space method have been utilized for illustrating topology of surface crossings. Double surface seam lines between (1)A1 and (3)B2 states have been found inside which the (3)B2 state is always lower in potential energy than the (1)A1 state, and thus it leads to an angle bias collision dynamics. Several conical∕surface intersections among these five low-lying states have been found to enrich dissociation pathways, and predissociation can even prefer bent-geometry channels. Especially, the dissociation of O((3)P) + CO can take place through the intersection between (3)B2 and (1)B2 states, and the intersection between (3)A2 and (1)B2 states.
authors.affiliation: Department of Applied Chemistry, Institute of Molecular Science and Center for Interdisciplinary Molecular Science, National Chiao-Tung University, Hsinchu 30050, Taiwan.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhou
authors.forename: Chaoyuan
authors.initials: C
authors.lastname: Zhu
authors.forename: Zhenyi
authors.initials: Z
authors.lastname: Wen
authors.forename: Zhenyi
authors.initials: Z
authors.lastname: Jiang
authors.forename: Jianguo
authors.initials: J
authors.lastname: Yu
authors.forename: Yuan-Pern
authors.initials: YP
authors.lastname: Lee
authors.forename: Sheng Hsien
authors.initials: SH
authors.lastname: Lin