Structure and stability of the AlX and AlX− species

Abstract

The electronic and geometrical structures of the ground and low-lying excited states of the diatomic AlX and ${\mathrm{AlX}}^{-}$ series (X=H, Li, Be, B, C, N, O, and F) are calculated by the coupled-cluster method with all singles and doubles and noniterative inclusion of triples using a large atomic natural orbital basis. All the ground-state AlX molecules except for AlF can attach an additional electron and form ground-state ${\mathrm{AlX}}^{-}$ anions. The ground-state ${\mathrm{AlBe}}^{-},$ ${\mathrm{AlB}}^{-},$ ${\mathrm{AlC}}^{-},$ ${\mathrm{AlN}}^{-},$ and ${\mathrm{AlO}}^{-}$ anions possess excited states that are stable toward autodetachment of an extra electron; ${\mathrm{AlBe}}^{-}$ also has a second excited state. Low-lying excited states of all AlX but AlN can attach an extra electron and form anionic states that are stable with respect to their neutral (excited) parent states. The ground-state ${\mathrm{AlLi}}^{-},$ ${\mathrm{AlBe}}^{-},$ ${\mathrm{AlB}}^{-},$ ${\mathrm{AlN}}^{-},$ and ${\mathrm{AlO}}^{-}$ anions are found to be thermodynamically more stable than their neutral parents. The most stable is ${\mathrm{AlO}}^{-},$ whose dissociation energy to ${\mathrm{Al+O}}^{-}$ is 6.4 eV. Correspondingly, AlO possesses the largest electron affinity (2.65 eV) in the series.