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- W2070296531 abstract "For the twelve title species, the bond order according to Mayer's definition, the Mulliken overlap population and the force constants are determined using the minimal STO-3G, split-valence 3-21G and 6-31G* (5d) basis sets. In general all these properties increase with increasing formal charge for each diatomic species. In contrast, the internuclear distances decrease with increasing formal charge. These findings indicate that the outer electrons in the three neutral diatomic species reside in antibonding orbitals; removing them results in triple bonds in the dications which are all predicted to be stable in their ground states in spite of the electrostatic repulsion. The best predictions for the unknown internuclear distances in the ionic ground states are: re(O22+) = 1.046; re(SO1+) = 1.411; re(SO2+) = 1.359; re (S21+) = 1.800 and re(S22+) =1.732 A. For acetylene, the behaviour on removal of the electrons is opposite to that observed for the diatomics: the bond order, overlap population and force constants all decrease with increasing formal charge. Both the acetylenic cation and dication are predicted to be stable, linear species in their electronic ground states with re(CC) = 1.247 and re(CH) = 1.076 A for the monocation and re(CC) = 1.326 and re(CH) = 1.116 A for the triplet dication. Using the SCF optimized structures, the total energies for the species were computed at the CISD and CISD-Q levels. These lead to predicted second ionization potentials of about 24.1, 19.1, 16.6 and 19.9 eV for O2, SO, S2 and C2H2, respectively." @default.
- W2070296531 created "2016-06-24" @default.
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- W2070296531 date "1989-01-01" @default.
- W2070296531 modified "2023-09-23" @default.
- W2070296531 title "Ab initio study of neutral O2, SO, S2, C2H2 and their mono- and dications" @default.
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- W2070296531 doi "https://doi.org/10.1016/0166-1280(89)80027-2" @default.
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