title: Ab initio calculations on low-lying electronic states of SbO2- and Franck-Condon simulation of its photodetachment spectrum.
abstract: Geometry optimization and harmonic vibrational frequency calculations have been carried out on the low-lying singlet and triplet electronic states of the antimony dioxide anion (SbO2-) employing a variety of ab initio methods. Both large-core and small-core relativistic effective core potentials were used for Sb in these calculations, together with valence basis sets of up to augmented correlation-consistent polarized-valence quintuple-zeta (aug-cc-pV5Z) quality. The ground electronic state of SbO2- is determined to be the X (1)A1 state, with the a (3)B1 state, calculated to be approximately 48 kcal mole(-1) (2.1 eV) higher in energy. Further calculations were performed on the X (2)A1, A (2)B2, and B (2)A2 states of SbO2 with the aim to simulating the photodetachment spectrum of SbO(2) (-). Potential energy functions (PEFs) of the X (1)A1 state of SbO2- and the X (2)A1, A (2)B2, and B (2)A2 states of SbO2 were computed at the complete-active-space self-consistent-field multireference internally contracted configuration interaction level with basis sets of augmented correlation-consistent polarized valence quadruple-zeta quality. Anharmonic vibrational wave functions obtained from these PEFs were used to compute Franck-Condon factors between the X (1)A1 state of SbO2- and the X (2)A1, A (2)B2, and B (2)A2 states of SbO2, which were then used to simulate the photodetachment spectrum of SbO2-, which is yet to be recorded experimentally.
authors.affiliation: Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong. epl@soton.ac.uk
authors.forename: Edmond P F
authors.initials: EP
authors.lastname: Lee
authors.forename: John M
authors.initials: JM
authors.lastname: Dyke
authors.forename: Daniel K W
authors.initials: DK
authors.lastname: Mok
authors.forename: Foo-tim
authors.initials: FT
authors.lastname: Chau
authors.forename: Wan-ki
authors.initials: WK
authors.lastname: Chow
mesh_terms: D000965:Antimony / Q000737:chemistry* / Q000528:radiation effects*; D003198:Computer Simulation; D004563:Electrochemistry / Q000379:methods*; D004579:Electron Transport; D008027:Light; D008956:Models, Chemical; D008958:Models, Molecular; D010087:Oxides / Q000737:chemistry* / Q000528:radiation effects*; D010777:Photochemistry / Q000379:methods*