arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2110.03075physics.chem-phphysics.comp-ph
收藏

junChS和junChS-F12模型:非共价复合物能量和结构的无参数有效而精确的复合方案

The junChS and junChS-F12 models: parameter-free efficient yet accurate composite schemes for energies and structures of non-covalent complexes

Jacopo Lupi, Silvia Alessandrini, Cristina Puzzarini, Vincenzo Barone

摘要:

最近开发的模型化学(表示为junChS [Alessandrini等人J. Chem. Theory Comput. 2020,16,988-1006])已经扩展到显式相关(F12)方法的使用。这使我们提出了一个家庭的有效的,可靠的和无参数的计划,计算精确的相互作用能的分子复合物统治的非共价相互作用。基于广泛的相互作用的全面基准测试表明,所谓的junChS-F12模型,采用具有成本效益的revDSD-PBEP 86-D3(BJ)参考几何结构,相对于其传统的对应物具有更好的性能,并且优于众所周知的模型化学。在不使用任何经验参数和负担得起的计算成本的情况下,junChS-F12达到了亚化学精度。分子复合物的精确表征通常限于能量学。为了向前迈出一步,传统的和F12复合计划开发的相互作用能已扩展到结构的测定。基准研究表明,最有效的选择是在fc-CCSD(T)-F12/jun-cc-pVTZ几何结构中加入MP2-F12核价相关校正,而不需要恢复基组叠加误差和外推到完整基组。

英文摘要:

A recently developed model chemistry (denoted as junChS [Alessandrini et al J. Chem. Theory Comput. 2020, 16, 988-1006]) has been extended to the employment of explicitly-correlated (F12) methods. This led us to propose a family of effective, reliable and parameter-free schemes for the computation of accurate interaction energies of molecular complexes ruled by non-covalent interactions. A thorough benchmark based on a wide range of interactions showed that the so-called junChS-F12 model, which employs cost-effective revDSD-PBEP86-D3(BJ) reference geometries, has an improved performance with respect to its conventional counterpart and outperforms well-known model chemistries. Without employing any empirical parameter and at an affordable computational cost, junChS-F12 reaches sub-chemical accuracy. Accurate characterizations of molecular complexes are usually limited to energetics. To take a step forward, the conventional and F12 composite schemes developed for interaction energies have been extended to structural determinations. A benchmark study demonstrated that the most effective option is to add MP2-F12 core-valence correlation corrections to fc-CCSD(T)-F12/jun-cc-pVTZ geometries without the need of recovering the basis set superposition error and the extrapolation to the complete basis set.

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。

↑