Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5415424 | Journal of Molecular Spectroscopy | 2009 | 5 Pages |
Abstract
Geometries and stabilities of the linear aluminum-bearing carbon chains AlC2nH (n = 1-5) in their ground states have been explored by the DFT-B3LYP and RCCSD(T) methods. Structures of the X1Σ+ and 11Î electronic states have also been optimized by the CASSCF approach. The studies indicate that these species have single-triple bond alternate pattern, AlCCCCâ¯CCH, and the electronic excitation from X1Σ+ to 11Î leads to the shortening of the AlC bonds. The vertical excitation energies of the 11Î Â â X1Σ+ and 21Î Â â X1Σ+ transitions for AlC2nH (n = 1-5) have been investigated by the CASPT2, EOM-CCSD, and TD-B3LYP levels of theory with the cc-pVTZ basis set, respectively. CASPT2-predicted 11Î Â â X1Σ+ transition energies are 3.57, 3.44, 3.33, 3.26, and 3.21 eV, respectively. For AlC2H, our estimate agrees very well with the experimental value of 3.57 eV. In addition, the AlC bond dissociation energies and the exponential-decay curves for these vertical excitation energies are also discussed.
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Authors
Xugeng Guo, Shoubin Wang, Junfeng Li, Lihui Jiang, Jinglai Zhang,