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arXiv 1704.04431physics.chem-phquant-ph
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结合Slater型轨道和有效核势

Combining Slater-type orbitals and effective core potentials

Michal Lesiuk, Aleksandra M. Tucholska, Robert Moszynski

摘要:

提出了一种计算Slater型轨道单电子基组有效核势矩阵元的一般方法。该方案是基于Barnett-Coulson方法的框架中的单个STO分布的平移。我们讨论自然出现的不同类型的积分,并将它们减少到可以递归计算或纯数值计算的几个基本量。此外,我们考虑评估的STO矩阵元素,涉及核心极化电位(CPP)和有效的自旋轨道电位。建设STO基组专门设计用于与ECP进行了讨论,并在比较与全电子基组的差异进行了简要总结。通过计算碱土金属(Ca,Sr,Ba)的激发能、静态偶极极化率和价轨道能,验证了该方法的有效性.最后,我们评估的相互作用能,永久偶极矩和电离能钡和锶钡,并比较它们与最好的实验和理论数据。

英文摘要:

We present a general methodology to evaluate matrix elements of the effective core potentials (ECPs) within one-electron basis set of Slater-type orbitals (STOs). The scheme is based on translation of individual STO distributions in the framework of Barnett-Coulson method. We discuss different types of integrals which naturally appear and reduce them to few basic quantities which can be calculated recursively or purely numerically. Additionally, we consider evaluation of the STOs matrix elements involving the core polarisation potentials (CPP) and effective spin-orbit potentials. Construction of the STOs basis sets designed specifically for use with ECPs is discussed and differences in comparison with all-electron basis sets are briefly summarised. We verify the validity of the present approach by calculating excitation energies, static dipole polarisabilities and valence orbital energies for the alkaline earth metals (Ca, Sr, Ba). Finally, we evaluate interaction energies, permanent dipole moments and ionisation energies for barium and strontium hydrides, and compare them with the best available experimental and theoretical data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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