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arXiv physics/0006069physics.chem-phphysics.comp-ph
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高斯基组下分子密度泛函理论计算中的积分精度

On the integration accuracy in molecular density functional theory calculations using Gaussian basis sets

Jan M. L. Martin, Charles W. Bauschlicher,, Alessandra Ricca

摘要:

用Gaussian 98程序系统计算了若干分子的密度泛函理论(密度泛函理论)分子性质(包括能量、几何形状、振动频率和红外强度)对径向和角向数值积分网格以及对分区方案的敏感性。典型的生产网格尺寸的问题对于第三行过渡金属系统特别严重,但对于像CCH这样简单的分子仍然可能导致定性上不正确的结果。实用的建议是相对于网格选择的能量(+梯度)的步骤,以及为解决方案的CPKS(耦合摄动科恩-沙姆)方程。

英文摘要:

The sensitivity of computed DFT (Density Functional Theory) molecular properties (including energetics, geometries, vibrational frequencies, and infrared intensities) to the radial and angular numerical integration grid meshes, as well as to the partitioning scheme, is discussed for a number of molecules using the Gaussian 98 program system. Problems with typical production grid sizes are particularly acute for third-row transition metal systems, but may still result in qualitatively incorrect results for a molecule as simple as CCH. Practical recommendations are made with respect to grid choices for the energy(+gradient) steps, as well as for the solution of the CPKS (Coupled Perturbed Kohn-Sham) equations.

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