首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >~(17)O Nuclear Quadrupole Coupling in Molecular and Lattice Systems by ab initio Calculation of Electric Field Gradients
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~(17)O Nuclear Quadrupole Coupling in Molecular and Lattice Systems by ab initio Calculation of Electric Field Gradients

机译:从头计算电场梯度在分子和晶格体系中的〜(17)O核四极偶合

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摘要

We present ab initio Hartree-Fock calculations of electric field gradients, which are related to experimental determinations of nuclear quadrupole coupling constants. The nucleus of special interest is ~(17)O but other nuclei in the molecules, especially ~(14)N, ~2H and ~(33)S are included. The calculations were performed (a) as single molecules either at the SCF and MP2 correlated levels, (b) as clusters of molecules about a test site, or (c) as lattice calculations computed in the unit cell environment. The basis sets are triple zeta valence plus polarisation in (a). Because of limitations in exponent range in (c), the bases in both (b) and (c), where comparison was sought, are DZ at the SCF level.
机译:我们提出从头开始的电场梯度的Hartree-Fock计算,这与核四极耦合常数的实验确定有关。特别令人关注的原子核是〜(17)O,但分子中的其他原子核,尤其是〜(14)N,〜2H和〜(33)S也包括在内。进行的计算是(a)在SCF和MP2相关水平的单个分子,(b)在测试部位周围的分子簇,或(c)在晶胞环境中计算的晶格计算。基本集是(a)中的三重zeta价加上极化。由于(c)中指数范围的限制,需要进行比较的(b)和(c)中的碱基都是SCF级别的DZ。

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