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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Counterpoise Corrected Ion/Molecule Complexes Using Two or Trhee Fragments
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Counterpoise Corrected Ion/Molecule Complexes Using Two or Trhee Fragments

机译:使用两个或Trhee片段进行平衡平衡校正的离子/分子复合物

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摘要

We report counterpoise (CP) corrected geometric optimizations for hydrated OH~-, H_3O~+, and NH_4~+ using various basis sets at the HF and MP2 levels. The CP corrections are calculated using two (CP2) and three (CP3) fragments. When three fragments are used, one is always H~+. Symmetrical structures for H_5O_2~+ and H_3O_2~+ cannot be obtained with only two (necessarily nonequivalent) fragments. There are no significant differences in the CP-optimized interaction energies for these systems. Nevertheless, unlike the more traditional two fragment procedure, the three fragment procedure allows convergence to symmetrical structures. This latter procedure is clearly preferable for systems such as OH~-/H_2O and H_3O~+/H_2O while introducing no significant error when used for unambiguously unsymmetrical systems, such as NH_4~+/H_2O.
机译:我们报告了在HF和MP2级别使用各种基础集对水合OH〜-,H_3O〜+和NH_4〜+进行平衡平衡(CP)校正的几何优化。使用两个(CP2)和三个(CP3)片段计算CP校正。当使用三个片段时,一个片段始终为H〜+。 H_5O_2〜+和H_3O_2〜+的对称结构无法仅使用两个(不一定是等效的)片段来获得。对于这些系统,CP优化的相互作用能没有显着差异。然而,与更传统的两个片段过程不同,三个片段过程允许收敛到对称结构。对于诸如OH _- / H_2O和H_3O〜+ / H_2O的系统,后一种过程显然是优选的,而当用于明确不对称的系统(如NH_4〜+ / H_2O)时,不会引入任何明显的误差。

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