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arXiv 1507.03339physics.chem-phcond-mat.mtrl-sci
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通过有效的MP2标度程序获得精确的非共价相互作用能

Accurate non-covalent interaction energies via an efficient MP2 scaling procedure

E. Fabiano, F. Della Sala, I. Grabowski

摘要:

利用观测到的CCSD(T)和MP2相关相互作用能的比例关系[I. Grabowski,E. Fabiano,F. Della Sala,Phys.Chem.Chem.Phys.15,15485(2013)],我们提出了一种简单的定标程序来计算非共价复合物的精确相互作用能。我们的方法利用MP2和CCSD(T)相关能,在相对较小的基组计算,并拟合比例系数产生几乎完整的基组限制CCSD(T)质量的相互作用能。由于计算中涉及的标度系数具有良好的可移植性,因此对于不同的分子间距离可以容易地获得良好的结果。

英文摘要:

Using the observed proportionality of CCSD(T) and MP2 correlation interaction energies [I. Grabowski, E. Fabiano, F. Della Sala, Phys. Chem. Chem. Phys. 15, 15485 (2013)] we propose a simple scaling procedure to compute accurate interaction energies of non-covalent complexes. Our method makes use of MP2 and CCSD(T) correlation energies, computed in relatively small basis sets, and fitted scaling coefficients to yield interaction energies of almost complete basis set limit CCSD(T) quality. Thanks to the good transferability of the scaling coefficients involved in the calculations, good results can be easily obtained for different intermolecular distances.

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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