Ab initio calculations on low-lying electronic states of Sb O-2and Franck-Condon simulation of its photodetachment spectrum

Edmond P.F. Lee, John M. Dyke, Kam Wah Mok, Foo Tim Chau, Wan Ki Chow

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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 (Sb O2-) 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 Sb O2- is determined to be the X̃ A11 state, with the ã B13 state, calculated to be ∼48 kcal mole-1 (2.1 eV) higher in energy. Further calculations were performed on the X̃ A12, Ã B22, and B̃ A22 states of Sb O2 with the aim to simulating the photodetachment spectrum of Sb O2-. Potential energy functions (PEFs) of the X̃ A11 state of Sb O2- and the X̃ A12, Ã B22, and B̃ A22 states of Sb O2 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 X̃ A11 state of Sb O2- and the X̃ A12, Ã B22, and B̃ A22 states of Sb O2, which were then used to simulate the photodetachment spectrum of Sb O2-, which is yet to be recorded experimentally.
Original languageEnglish
Article number094306
JournalJournal of Chemical Physics
Volume127
Issue number9
DOIs
Publication statusPublished - 13 Sep 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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