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Coupled cluster study of the energetic properties of S-2(x) (x=0,+1,1)

机译:S-2(x)(x = 0,+ 1,1)的能量性质的耦合聚类研究

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Ab initio electronic structure calculations are reported for S-2, and its ions S-2(+) and S-2(-). Geometric parameters are calculated using the singles and doubles coupled cluster method, including a perturbational correction for connected triple excitation, together with systematic sequences of correlation consistent basis sets extrapolated to the complete basis set (CBS) limit. Energetic and structural properties of S-2 and the S-2 cation and anion are reported. The heat of formation of S-2 ((3)Sigma(-)(g)) at 0 K in the gas phase is predicted to be 29.8 kcal/mol from the average of CBS two extrapolation procedures, less than the experimental heat of formation of S-2 of 30.66 +/- 0.07 kcal/mol. The 0 K adiabatic ionization potential and electron affinity are predicted to be 9.37 and 1.68 eV, respectively. (c) 2007 American Institute of Physics.
机译:报告了S-2及其离子S-2(+)和S-2(-)的从头算电子结构计算。几何参数是使用单双耦合簇方法计算的,包括对连接的三重激发的微扰校正,以及相关的一致基集的系统序列,外推到完整基集(CBS)极限。报道了S-2以及S-2阳离子和阴离子的能量和结构性质。根据CBS两种外推程序的平均值,气相中S-2((3)Sigma(-)(g))在0 K时的形成热预计为29.8 kcal / mol,小于CBS的实验热。 S-2的形成为30.66 +/- 0.07 kcal / mol。预测0 K绝热电离势和电子亲和力分别为9.37和1.68 eV。 (c)2007年美国物理研究所。

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