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The Moving-Grid Effect in the Harmonic Vibrational Frequency Calculations with Numeric Atom-Centered Orbitals
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2020-03-27 , DOI: 10.1021/acs.jpca.0c01453
Honghui Shang 1 , Jinlong Yang 2
Affiliation  

When using atom-centered integration grids, the portion of the grid that belongs to a certain atom also moves when this atom is displaced. In the paper, we investigate the moving-grid effect in the calculation of the harmonic vibrational frequencies when using all-electron full-potential numeric atomic-centered orbitals as the basis set. We find that, unlike the first-order derivative (i.e., forces), the moving-grid effect plays an essential role for the second-order derivatives (i.e., vibrational frequencies). Further analysis reveals that the predominantly diagonal force constant terms are affected, which can be bypassed efficiently by invoking translational symmetry. Our approaches have been demonstrated in both finite (molecules) and extended (periodic) systems.

中文翻译:

具有数字原子中心轨道的谐波振动频率计算中的运动网格效应

当使用以原子为中心的积分网格时,属于该原子的网格部分在该原子位移时也会移动。本文以全电子全能数字原子中心轨道为基础,研究了在计算谐波振动频率时的动网格效应。我们发现,与一阶导数(即力)不同,移动网格效应对二阶导数(即振动频率)起着至关重要的作用。进一步的分析表明,主要是对角力常数项会受到影响,可以通过调用平移对称性有效地绕开这些项。我们的方法已经在有限(分子)系统和扩展(周期性)系统中得到了证明。
更新日期:2020-03-27
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