arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.06364physics.chem-ph
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MAP:一个基于绝热联系理论的弱相互作用的MP2精度预报器

MAP: an MP2 accuracy predictor for weak interactions from adiabatic connection theory

Stefan Vuckovic, Eduardo Fabiano, Paola Gori-Giorgi, Kieron Burke

摘要:

二阶Møller-Plesset微扰理论(MP2)用直线近似精确的Hartree-Fock(HF)绝热连接(AC)曲线。因此,通过使用精确曲线与线性行为的偏差,我们构建了MP2准确性的指标。然后,我们使用沿HF AC的插值将我们的指标的确切形式转换为高度实用的MP2准确度预测器(MAP),其额外计算成本可以忽略不计。我们表明,这个指标已经适用于系统,解离成片段与非简并基态,我们说明了它的有用性,将其应用到S22和S66数据集。

英文摘要:

Second order Møller-Plesset perturbation theory (MP2) approximates the exact Hartree-Fock (HF) adiabatic connection (AC) curve by a straight line. Thus by using the deviation of the exact curve from the linear behaviour, we construct an indicator for the accuracy of MP2. We then use an interpolation along the HF AC to transform the exact form of our indicator into a highly practical MP2 accuracy predictor (MAP) that comes at negligible additional computational cost. We show that this indicator is already applicable to systems that dissociate into fragments with a non-degenerate ground state, and we illustrate its usefulness by applying it to the S22 and S66 datasets.

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