The electronic structure of the disilavinylidene ( HZSi = Si) -anion is investigated with the MC SCF CI and CEPA methods. In addition to the doublet ground state ( 2B2) with an electron affinity of 1.65 eV, an excited state (4A") is found which is still stable by about 0.6 eV. 'A, 'A\* \*B\* K(3a1)\
The electronic structure and stability of the H−3 anion
✍ Scribed by H.H. Michels; J.A. Montgomery Jr.
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 457 KB
- Volume
- 139
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
A systematic study of the electronic structure of the H;-anion has been carried out using both perturbation theory and contiguration interaction. Counterpoise corrections are used to estimate the basis set superposition error in the computed dissociation energy. We find that H, is not thermodynamically stable relative to H-+Hr upon consideration of the vibrational zero-point contribution to the dissociation energy. Isotopic analysis predicts weak stability, however, for D, and Dz-H-.
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The planar cis conformer is calculated as lowest in energy but the trans is sufficiently close that both species may be present at room temperature. The difference in the peak absorption energy for the strong 1 'A'+2 'A' transition is calculated to be sufflciently large between the conformers to dis
The clatromc structure of the ground and excited states of tic Li; anion has been stud& using oplirnized CI wavefunctions The low-lying '"8 and 'C: (u" stale is of the Feshbach type and cxhibllr a near-degeneracy bclwan '2; (u'= 0) of Li, -6) or b2\_ In conlras~ wilh LI-IC H; system. we find a nch